content: /*
   * This file was automatically generated by UTestGen and EvoSuite
   * Tue Mar 19 19:20:08 GMT 2024
   */
  
  package org.jdom2;
  
  import org.junit.jupiter.api.Test;
  import static org.junit.jupiter.api.Assertions.*;
  import org.junit.jupiter.api.Timeout;
  import java.util.concurrent.TimeUnit;
  import static org.evosuite.runtime.EvoAssertions.*;
  import java.util.LinkedList;
  import java.util.List;
  import org.evosuite.runtime.EvoRunner;
  import org.evosuite.runtime.EvoRunnerParameters;
  import org.jdom2.Attribute;
  import org.jdom2.AttributeType;
  import org.jdom2.Element;
  import org.jdom2.EntityRef;
  import org.jdom2.Namespace;
  import org.jdom2.Text;
  import org.jdom2.Verifier;
  import org.junit.runner.RunWith;
  
  @RunWith(EvoRunner.class) @EvoRunnerParameters(mockJVMNonDeterminism = true, useVFS = true, useVNET = true, resetStaticState = true, separateClassLoader = true) 
  public class Verifier_ESTest extends Verifier_ESTest_scaffolding {
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckURI0() throws Throwable  {
        // Given a URI with a percent sign that is not followed by two hexadecimal digits
        String uri = ":59_/TPN??JN%C";
        
        // When the checkURI method is called with this URI
        String checkURI = Verifier.checkURI(uri);
        
        // Then the method should return null, indicating that the URI is invalid
        assertNull(checkURI);
        
        // And an error message should be returned explaining that the percent sign must be followed by exactly two hexadecimal digits
        assertEquals("Percent signs in URIs must be followed by exactly two hexadecimal digits.", checkURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLWhitespaceReturningFalse() throws Throwable  {
        // No Comments were added
        boolean xMLWhitespace = Verifier.isXMLWhitespace('C');
        assertFalse(xMLWhitespace);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testDecodeSurrogatePairReturningNegative() throws Throwable  {
        // No Comments were added
        int decodeSurrogatePair = Verifier.decodeSurrogatePair('r', 'r');
        assertEquals((-56497038), decodeSurrogatePair);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking1And1AndCheckNamespaceCollisionTaking1And10() throws Throwable  {
        // Given
        Namespace namespace = Namespace.NO_NAMESPACE;
        Element element = new Element("VQFS", namespace);
        
        // When
        String result = Verifier.checkNamespaceCollision(namespace, element);
        
        // Then
        assertNull(result);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckElementNameReturningNull() throws Throwable  {
        // Check if the element name is null when passing a valid entity reference
        String checkElementName = Verifier.checkElementName("org.jdom2.EntityRef");
        assertNull(checkElementName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckAttributeNameReturningNull() throws Throwable  {
        // Check that the method returns null for a valid attribute name
        String checkAttributeName = Verifier.checkAttributeName("age");
        assertNull(checkAttributeName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLWhitespace0() throws Throwable  {
        // This test verifies that the 'isXMLWhitespace' method correctly identifies newline characters as whitespace
        boolean xMLWhitespace = Verifier.isXMLWhitespace('\n');
        assertTrue(xMLWhitespace);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLWhitespace1() throws Throwable  {
        // Test that a carriage return character is considered XML whitespace
        boolean actualResult = Verifier.isXMLWhitespace('\r');
        assertTrue(actualResult);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLWhitespace2() throws Throwable  {
        // No Comments were added
        boolean xMLWhitespace = Verifier.isXMLWhitespace('\t');
        assertTrue(xMLWhitespace);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLNameStartCharacterReturningFalse() throws Throwable  {
        // Test that the character '^' is not a valid XML name start character
        boolean xMLNameStartCharacter = Verifier.isXMLNameStartCharacter('^');
        assertFalse(xMLNameStartCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLNameStartCharacterWithOtherChar() throws Throwable  {
        // Check if the character ':' is a valid XML name start character
        boolean xMLNameStartCharacter = Verifier.isXMLNameStartCharacter(':');
        assertTrue(xMLNameStartCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLNameStartCharacter() throws Throwable  {
        // No Comments were added
        boolean xMLNameStartCharacter = Verifier.isXMLNameStartCharacter('L');
        assertTrue(xMLNameStartCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLNameCharacter() throws Throwable  {
        // No Comments were added
        boolean xMLNameCharacter = Verifier.isXMLNameCharacter('M');
        assertTrue(xMLNameCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLNameCharacterReturningFalse() throws Throwable  {
        // Test if '@' is a valid XML name character
        boolean xMLNameCharacter = Verifier.isXMLNameCharacter('@');
        assertFalse(xMLNameCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLNameCharacterWithOtherChar() throws Throwable  {
        // Test that the Verifier.isXMLNameCharacter() method returns true for a colon character (':')
        boolean xMLNameCharacter = Verifier.isXMLNameCharacter(':');
        assertTrue(xMLNameCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsURICharacterReturningTrue() throws Throwable  {
        // No Comments were added
        boolean uRICharacter = Verifier.isURICharacter('$');
        assertTrue(uRICharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsURICharacterReturningFalse() throws Throwable  {
        // Test if a '#' character is a valid URI character
        // The test is checking that the character '#' is not considered a valid URI character
        boolean isValidURICharacter = Verifier.isURICharacter('#');
        assertFalse(isValidURICharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsHexDigitReturningFalse() throws Throwable  {
        // Test that the method returns true for a hexadecimal digit character
        boolean hexDigit = Verifier.isHexDigit('a');
        assertTrue(hexDigit);
        
        // Test that the method returns false for a non-hexadecimal digit character
        hexDigit = Verifier.isHexDigit('g');
        assertFalse(hexDigit);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsHexDigit0() throws Throwable  {
        // Tests that a character is considered a hexadecimal digit if it is an uppercase letter A-F
        boolean hexDigit = Verifier.isHexDigit('A');
        assertTrue(hexDigit);
        
        // Tests that a character is not considered a hexadecimal digit if it is a lowercase letter a-f
        boolean notHexDigit = Verifier.isHexDigit('a');
        assertFalse(notHexDigit);
        
        // Tests that a character is not considered a hexadecimal digit if it is a letter other than A-F or a-f
        boolean notHexDigit2 = Verifier.isHexDigit('Z');
        assertFalse(notHexDigit2);
        
        // Tests that a character is not considered a hexadecimal digit if it is a number
        boolean notHexDigit3 = Verifier.isHexDigit('1');
        assertFalse(notHexDigit3);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsHexDigitWithDigit() throws Throwable  {
        // Test that Verifier.isHexDigit() returns true for a hexadecimal digit character
        boolean hexDigit = Verifier.isHexDigit('1');
        assertTrue(hexDigit); // Assert that the method returns true for a valid hexadecimal digit character
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckXMLNameReturningNull() throws Throwable  {
        // The method checkXMLName is called with the argument "Tmns".
        String checkXMLName = Verifier.checkXMLName("Tmns");
        
        // Asserts that the returned value is null, indicating that the name is invalid.
        assertNull(checkXMLName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckXMLName() throws Throwable  {
        // Arrange
        String xmlName = ":GTjpe&";
        
        // Act
        String checkXMLName = Verifier.checkXMLName(xmlName);
        
        // Assert
        assertEquals("XML names cannot contain the character \"&\"", checkXMLName);
        assertNotNull(checkXMLName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void test0() throws Throwable  {
        EntityRef entityRef = null;
        try {
        entityRef = new EntityRef("&W+`X0", " with an attribute namespace prefix on the element", "&W+`X0");
        fail("Expecting exception: IllegalArgumentException");
        } catch(IllegalArgumentException e) {
        // This is expected, as &W+`X0 is not a legal XML name.
        verifyException("org.jdom2.EntityRef", e);}
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar0() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter(' ');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterWithDigit() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('7');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar1() throws Throwable  {
        // Test that a character is considered as XML Public ID Character
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('@');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacter() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('p');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1AndCheckNamespaceCollisionTaking11And10() throws Throwable  {
        // Given a namespace and a list of objects with the same namespace
        Namespace arg0 = Namespace.XML_NAMESPACE;
        LinkedList<Object> arg1 = new LinkedList<>();
        arg1.add((Object) arg0);
        
        // When we check for namespace collisions using the Verifier method
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(arg0, (List<?>) arg1, (-570));
        
        // Then we expect the result to be null, as there are no other namespaces with the same value in the list
        assertNull(checkNamespaceCollision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1ReturningNonEmptyStringAndCheckNamespaceCollisionTaking11And10() throws Throwable  {
        // Given a Namespace object with the prefix "org.jdom2.Verifier"
        Namespace verifierNamespace = Namespace.getNamespace("org.jdom2.Verifier");
        
        // And an Attribute object with the value "'@XJyYZ"
        Attribute attribute = new Attribute("org.jdom2.Verifier", "'@XJyYZ");
        
        // When the method Verifier.checkNamespaceCollision is called with the Namespace object and the List of namespaces in scope
        String collisionMessage = Verifier.checkNamespaceCollision(verifierNamespace, attribute.getNamespacesInScope(), 35);
        
        // Then the message "The namespace prefix "" collides with an additional namespace declared by the element" should be returned
        assertNotNull(collisionMessage);
        assertEquals("The namespace prefix \"\" collides with an additional namespace declared by the element", collisionMessage);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1WithNull() throws Throwable  {
        // Test that checkNamespaceCollision returns null when passed a null input
        Namespace arg0 = Namespace.XML_NAMESPACE;
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(arg0, (List<?>) null, (-115));
        assertNull(checkNamespaceCollision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1AndCheckNamespaceCollisionTaking11And11() throws Throwable  {
        // Given a new attribute "q"
        Attribute arg0 = new Attribute("q", "q");
        
        // When we check if the namespace collision exists between this attribute and an element with ID 540
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(arg0, (Element) null, 540);
        
        // Then the method should return null as there is no collision
        assertNull(checkNamespaceCollision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking2NamespacesReturningNonEmptyString() throws Throwable  {
        // Given two namespaces with a conflicting prefix
        Namespace ns1 = Namespace.getNamespace("&9,h?l");
        Namespace ns2 = Namespace.getNamespace("URIs cannot contain 0x5d");
        
        // When we check for namespace collision
        String result = Verifier.checkNamespaceCollision(ns1, ns2);
        
        // Then we expect the method to return a non-null value and the error message
        assertNotNull(result);
        assertEquals("The namespace prefix \"\" collides", result);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking2Namespaces0() throws Throwable  {
        // Given: Two objects of the same type with the same namespace value
        Namespace arg1 = Namespace.XML_NAMESPACE;
        Namespace arg2 = Namespace.XML_NAMESPACE;
        
        // When: We call Verifier.checkNamespaceCollision() with these two objects as arguments
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(arg1, arg2);
        
        // Then: The method should return null since there is no collision
        assertNull(checkNamespaceCollision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCharacterDataReturningNonEmptyString() throws Throwable  {
        // Given: A string that contains illegal XML characters
        String illegalXmlCharacters = "This string contains illegal XML characters (<&>)";
        
        // When: We pass the string to the Verifier class's checkCharacterData method
        String checkCharacterData = Verifier.checkCharacterData(illegalXmlCharacters);
        
        // Then: The method should return an error message indicating that a null is not a legal XML value
        assertEquals("A null is not a legal XML value", checkCharacterData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsAllXMLWhitespaceReturningFalse() throws Throwable  {
        // No Comments were added
        boolean allXMLWhitespace = Verifier.isAllXMLWhitespace("abc");
        assertFalse(allXMLWhitespace);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsAllXMLWhitespaceReturningTrue() throws Throwable  {
        // Tests that a string containing only whitespace characters is considered to be XML whitespace
        boolean allXMLWhitespace = Verifier.isAllXMLWhitespace("\t\n\r");
        assertTrue(allXMLWhitespace);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void test1() throws Throwable  {
        // No Comments were added
        String normalizeString = Text.normalizeString("URL percent encoding errors must be corrected.");
        assertEquals("URL percent encoding errors must be corrected.", normalizeString);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLDigitReturningTrue() throws Throwable  {
        // Test that Verifier.isXMLDigit() returns true for a valid XML digit character
        boolean xMLDigit = Verifier.isXMLDigit('0');
        assertTrue(xMLDigit);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLDigitReturningFalse() throws Throwable  {
        // Given: We have a method isXMLDigit that takes a character as input and returns true if the character is a digit in the XML schema.
        // When: We pass the character 'a' to the method.
        boolean xMLDigit = Verifier.isXMLDigit('a');
        // Then: The method should return false, since 'a' is not a digit in the XML schema.
        assertFalse(xMLDigit);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLExtender0() throws Throwable  {
        // No Comments were added
        boolean xMLExtender = Verifier.isXMLExtender('<');
        assertFalse(xMLExtender);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLExtender1() throws Throwable  {
        // Test that the character '\uFF3B' is not considered an XML extender
        boolean xMLExtender = Verifier.isXMLExtender('\uFF3B');
        assertFalse(xMLExtender);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLCombiningChar() throws Throwable  {
        // Given: We have a method called isXMLCombiningChar that takes a character as input and returns true if it is an XML combining character.
        // When: We pass the carriage return character ('\r') to the method.
        boolean xMLCombiningChar = Verifier.isXMLCombiningChar('\r');
        
        // Then: The method should return false because the carriage return character is not an XML combining character.
        assertFalse(xMLCombiningChar);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLLetterReturningTrue() throws Throwable  {
        // Test that the Verifier.isXMLLetter() method returns true for a valid XML letter character
        boolean xMLLetter = Verifier.isXMLLetter('a');
        assertTrue(xMLLetter);
        
        // The 'a' is a valid XML letter because it satisfies the following conditions:
        // 1. It is an ASCII letter (0x41 - 0x5A or 0x61 - 0x7A)
        // 2. It is not a digit (0x30 - 0x39)
        // 3. It is not a dash (-) or underscore (_) character
        assertTrue(Verifier.isXMLLetter('a'), "The 'a' character should be considered an XML letter");
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLLetterReturningFalse() throws Throwable  {
        // No Comments were added
        boolean xMLLetter = Verifier.isXMLLetter('_');
        assertFalse(xMLLetter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLLetterOrDigitReturningTrue() throws Throwable  {
        // Check if the given character is a letter or digit according to XML specification
        boolean xmlLetterOrDigit = Verifier.isXMLLetterOrDigit('q');
        
        // Assert that the given character is indeed a letter or digit
        assertTrue(xmlLetterOrDigit);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLLetterOrDigitReturningFalse() throws Throwable  {
        // rollbacked to evosuite
        boolean xMLLetterOrDigit = Verifier.isXMLLetterOrDigit(' ');
        assertFalse(xMLLetterOrDigit);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckProcessingInstructionTarget0() throws Throwable  {
        // Given
        String processingInstruction = ": ";
        
        // When
        String result = Verifier.checkProcessingInstructionTarget(processingInstruction);
        
        // Then
        assertEquals("XML names cannot contain the character \" \"", result);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLCharacterAndIsXMLCharacterReturningFalse0() throws Throwable  {
        // Given: We have a method isXMLCharacter() that takes an integer as input and returns true if it is a valid XML character, and false otherwise.
        // When: The method is called with the argument 29, which is not a valid XML character.
        // Then: The method should return false, indicating that 29 is not a valid XML character.
        boolean xMLCharacter = Verifier.isXMLCharacter(29);
        assertFalse(xMLCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLCharacterAndIsXMLCharacterReturningTrue0() throws Throwable  {
        // No Comments were added
        boolean xMLCharacter = Verifier.isXMLCharacter(65536);
        assertTrue(xMLCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLCharacterAndIsXMLCharacterReturningFalse1() throws Throwable  {
        // No Comments were added
        boolean xMLCharacter = Verifier.isXMLCharacter(10549237);
        assertFalse(xMLCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLCharacterAndIsXMLCharacterReturningTrue1() throws Throwable  {
        // No Comments were added
        boolean xMLCharacter = Verifier.isXMLCharacter('A');
        assertTrue(xMLCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsLowSurrogate() throws Throwable  {
        // Test that a high surrogate character is not considered a low surrogate
        boolean highSurrogate = Verifier.isHighSurrogate('\uD800');
        assertFalse(highSurrogate);
        
        // Test that a low surrogate character is considered a low surrogate
        boolean lowSurrogate = Verifier.isLowSurrogate('\uDC00');
        assertTrue(lowSurrogate);
        
        // Test that a non-surrogate character is not considered a low surrogate
        boolean nonSurrogate = Verifier.isLowSurrogate('a');
        assertFalse(nonSurrogate);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsHighSurrogateReturningTrue() throws Throwable  {
        // Test to verify that the Verifier is able to identify a high surrogate character
        boolean highSurrogate = Verifier.isHighSurrogate('\uD800');
        assertTrue(highSurrogate);
        // The "\uD800" represents a high surrogate character
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsHighSurrogateReturningFalse() throws Throwable  {
        // Given a character that is a high surrogate, we expect the method to return true
        boolean highSurrogate = Verifier.isHighSurrogate('\uDC00');
        assertTrue(highSurrogate);
        
        // When we call the method with a low surrogate, we expect it to return false
        boolean lowSurrogate = Verifier.isHighSurrogate('\uDE8F');
        assertFalse(lowSurrogate);
        
        // Then we check that the method returns true for a character that is neither a high nor a low surrogate
        char nonSurrogate = 'a';
        boolean notASurrogate = Verifier.isHighSurrogate(nonSurrogate);
        assertFalse(notASurrogate);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsHexDigit1() throws Throwable  {
        // Test that a letter character is considered a hexadecimal digit
        boolean hexDigit = Verifier.isHexDigit('a');
        assertTrue(hexDigit);
        
        // Check that other characters are not considered hexadecimal digits
        assertFalse(Verifier.isHexDigit('z'));
        assertFalse(Verifier.isHexDigit('A'));
        assertFalse(Verifier.isHexDigit('Z'));
        assertFalse(Verifier.isHexDigit(' '));
        assertFalse(Verifier.isHexDigit('!'));
        
        // Check that the method works for all hexadecimal digits (0-9, a-f)
        for (char c = '0'; c <= '9'; c++) {
        assertTrue(Verifier.isHexDigit(c));
        }
        for (char c = 'a'; c <= 'f'; c++) {
        assertTrue(Verifier.isHexDigit(c));
        }
        
        // Check that the method returns false for non-hexadecimal digits
        assertFalse(Verifier.isHexDigit('g'));
        assertFalse(Verifier.isHexDigit('G'));
        assertFalse(Verifier.isHexDigit('z'));
        assertFalse(Verifier.isHexDigit('Z'));
        assertFalse(Verifier.isHexDigit(' '));
        assertFalse(Verifier.isHexDigit('!'));
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsHexDigitWithOtherChar() throws Throwable  {
        // No Comments were added
        boolean hexDigit = Verifier.isHexDigit('\u000B');
        assertFalse(hexDigit);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckURI1() throws Throwable  {
        // No Comments were added
        String checkURI = Verifier.checkURI("Q%B=#T7AQ.`52:LbJJ");
        assertEquals("Percent signs in URIs must be followed by exactly two hexadecimal digits.", checkURI);
        assertNotNull(checkURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckURI2() throws Throwable  {
        // Arrange
        String uri = "6w%~{*'0Z[";
        
        // Act
        String checkURI = Verifier.checkURI(uri);
        
        // Assert
        assertNotNull(checkURI);
        assertEquals("Percent signs in URIs must be followed by exactly two hexadecimal digits.", checkURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckURI3() throws Throwable  {
        // No Comments were added
        String checkURI = Verifier.checkURI("0x%04x is not a legal XML character");
        assertNotNull(checkURI);
        assertEquals("URIs cannot contain 0x20", checkURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckURIWithEmptyString() throws Throwable  {
        // No Comments were added
        String checkURI = Verifier.checkURI("");
        assertNull(checkURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckURIReturningNull() throws Throwable  {
        // Check if the input URI is valid and return null if it is not
        String checkURI = Verifier.checkURI("https://www.example.com");
        assertNull(checkURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckURIWithNull() throws Throwable  {
        // Check if passing a null value to the Verifier.checkURI() method returns a null value.
        // Arrange
        String checkURI = Verifier.checkURI((String) null);
        
        // Act
        assertNull(checkURI);
        
        // Assert
        // Check that the returned value is null, which means that the method did not perform any validation on the input parameter.
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckXMLNameWithEmptyString() throws Throwable  {
        // Test to ensure that XML names cannot be empty
        String checkXMLName = Verifier.checkXMLName("");
        assertEquals("XML names cannot be empty", checkXMLName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckXMLNameWithNull() throws Throwable  {
        // Check that a null input returns an error message
        String checkXMLName = Verifier.checkXMLName(null);
        assertEquals("XML names cannot be null", checkXMLName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckSystemLiteralReturningNonEmptyString() throws Throwable  {
        // Given a system literal with both single and double quotes
        String systemLiteral = "Qk\"L8;'U^%4~T8;G";
        
        // When the system literal is checked for correctness
        String checkSystemLiteral = Verifier.checkSystemLiteral(systemLiteral);
        
        // Then the result should indicate that the system literal cannot contain both single and double quotes
        assertEquals("System literals cannot simultaneously contain both single and double quotes.", checkSystemLiteral);
        
        // And the result should not be null
        assertNotNull(checkSystemLiteral);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckSystemLiteral0() throws Throwable  {
        String checkSystemLiteral = Verifier.checkSystemLiteral("7eB(YGl[S9-z'PCB|Fc");
        // This test checks that the method returns null when passed a string that contains an invalid system literal
        assertNull(checkSystemLiteral);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckSystemLiteralWithNull() throws Throwable  {
        // No Comments were added
        String checkSystemLiteral = Verifier.checkSystemLiteral((String) null);
        assertNull(checkSystemLiteral);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckSystemLiteral1() throws Throwable  {
        // Given: A String variable "checkSystemLiteral" contains a string value "This is a string".
        String checkSystemLiteral = Verifier.checkSystemLiteral("This is a string");
        
        // When: The method "checkSystemLiteral()" is called on the String object with the parameter "This is a string".
        assertNull(checkSystemLiteral);
        
        // Then: The method should return null, as the input string does not contain any system-specific literals.
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckPublicIDReturningNonEmptyString() throws Throwable  {
        String input = " 'D;Y)iQ:-4[>;4";
        
        // When the method checkPublicID is called with this string as input
        String result = Verifier.checkPublicID(input);
        
        // Then the method should return a message indicating that the character is not legal in public IDs
        assertEquals("[ is not a legal character in public IDs", result);
        
        // And the method should not return null
        assertNotNull(result);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckPublicIDWithNull() throws Throwable  {
        // Check that a null input returns a null value
        String checkPublicID = Verifier.checkPublicID((String) null);
        assertNull(checkPublicID);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar2() throws Throwable  {
        // This test case is written to ensure that the Verifier.isXMLPublicIDCharacter() method returns true when passed the tab character as an argument.
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('\t');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar3() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('\r');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar4() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('\n');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar5() throws Throwable  {
        // No Comments were added
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('%');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar6() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('_');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar7() throws Throwable  {
        // No Comments were added
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('$');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar8() throws Throwable  {
        // No Comments were added
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('#');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar9() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('=');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterAndIsXMLPublicIDCharacterWithOtherChar10() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('!');
        assertTrue(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testIsXMLPublicIDCharacterReturningFalse() throws Throwable  {
        boolean xMLPublicIDCharacter = Verifier.isXMLPublicIDCharacter('\uFFF4');
        assertFalse(xMLPublicIDCharacter);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckPublicID() throws Throwable  {
        String checkPublicID = Verifier.checkPublicID("0x0023 is not a legal XML character");
        assertNull(checkPublicID);
        
        // The test asserts that the method returns null, which means that the given input (a string containing an invalid character) does not satisfy the method's requirements.
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCommentData0() throws Throwable  {
        // Given a string that ends with a hyphen, verify that it returns a non-null value.
        String input = "-";
        String checkCommentData = Verifier.checkCommentData(input);
        
        // Then the function should return an error message indicating that the comment data cannot end with a hyphen.
        assertNotNull(checkCommentData);
        assertEquals("Comment data cannot end with a hyphen.", checkCommentData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCommentData1() throws Throwable  {
        // Given a string containing a comment with double hyphens
        String input = "<!-- Hello, World! -->";
        
        // When the checkCommentData method is called with this string as an argument
        String checkCommentData = Verifier.checkCommentData(input);
        
        // Then the method should return a message indicating that comments cannot contain double hyphens (--)
        assertEquals("Comments cannot contain double hyphens (--)", checkCommentData);
        
        // And the method should not return null
        assertNotNull(checkCommentData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCommentDataWithNull() throws Throwable  {
        // No Comments were added
        String checkCommentData = Verifier.checkCommentData((String) null);
        assertNotNull(checkCommentData);
        assertEquals("A null is not a legal XML value", checkCommentData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCommentDataReturningNull() throws Throwable  {
        // No Comments were added
        String checkCommentData = Verifier.checkCommentData("Hello World!");
        assertNull(checkCommentData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckProcessingInstructionDataReturningNull() throws Throwable  {
        // Check that the processing instruction data is valid
        String checkProcessingInstructionData = Verifier.checkProcessingInstructionData("<!DOCTYPE html><html lang=\"en\"><head><title>Title</title></head><body><p>Hello, world!</p></body></html>");
        // Assert that the processing instruction data is null, indicating it is valid
        assertNull(checkProcessingInstructionData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckProcessingInstructionData() throws Throwable  {
        // Given a processing instruction string that contains a "?>" sequence
        String piString = "<?pi target=\"http://example.com\"?>";
        
        // When the string is passed to the checkProcessingInstructionData method
        String checkProcessingInstructionData = Verifier.checkProcessingInstructionData(piString);
        
        // Then the method should return a non-null value indicating that the processing instruction is invalid
        assertNotNull(checkProcessingInstructionData);
        
        // And the returned message should indicate that the processing instruction cannot contain the string "?>"
        assertEquals("Processing instructions cannot contain the string \"?>\"", checkProcessingInstructionData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckProcessingInstructionDataWithNull() throws Throwable  {
        // No Comments were added
        String checkProcessingInstructionData = Verifier.checkProcessingInstructionData((String) null);
        assertEquals("A null is not a legal XML value", checkProcessingInstructionData);
        assertNotNull(checkProcessingInstructionData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckProcessingInstructionTargetReturningNull() throws Throwable  {
        // Test that a processing instruction with a valid target name is returned as null.
        String checkProcessingInstructionTarget = Verifier.checkProcessingInstructionTarget("XML-stylesheet");
        assertNull(checkProcessingInstructionTarget);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckProcessingInstructionTarget1() throws Throwable  {
        // Check that the target of a processing instruction cannot contain colons
        String checkProcessingInstructionTarget = Verifier.checkProcessingInstructionTarget("Ptfw:cF");
        assertNotNull(checkProcessingInstructionTarget);
        assertEquals("Invalid processing instruction target", checkProcessingInstructionTarget);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckProcessingInstructionTarget2() throws Throwable  {
        // Check that processing instructions cannot have a target of "xml" in any combination of case.
        String checkProcessingInstructionTarget = Verifier.checkProcessingInstructionTarget("xml");
        assertNotNull(checkProcessingInstructionTarget);
        
        // Assert that the target is not equal to "xml" or "XML", as these are reserved targets and should not be used.
        assertEquals("Processing instructions cannot have a target of \"xml\" in any combination of case.", checkProcessingInstructionTarget, "<?xml ... ?>");
        
        // Assert that the target is not equal to "xml" or "XML", as these are reserved targets and should not be used.
        assertNotEquals("Processing instructions cannot have a target of \"xml\" in any combination of case.", checkProcessingInstructionTarget, "<?XML ... ?>");
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking1And10() throws Throwable  {
        // Given
        Namespace xmlNamespace = Namespace.XML_NAMESPACE;
        Attribute tmnsAttribute = new Attribute("Tmns", "Tmns", xmlNamespace);
        
        // When
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(xmlNamespace, tmnsAttribute);
        
        // Then
        assertNull(checkNamespaceCollision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking1And11() throws Throwable  {
        // Test that verifying namespace collision returns null when there is no collision
        Namespace arg0 = Namespace.NO_NAMESPACE; // The first namespace to check for collisions
        Attribute arg1 = new Attribute("VQFe", "VQFe", arg0); // A second attribute with the same name but different namespace
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(arg0, arg1);
        assertNull(checkNamespaceCollision); // Assert that the collision is null, which means there is no collision
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1WithZero() throws Throwable  {
        // Given
        Element element = new Element("Qer", "Qer", "Qer");
        
        // When
        Element attr1 = element.setAttribute("Qer", "Qer");
        Namespace ns0 = Namespace.NO_NAMESPACE;
        String collision = Verifier.checkNamespaceCollision(ns0, attr1, 0);
        
        // Then
        assertNull(collision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1ReturningNonEmptyStringAndCheckNamespaceCollisionTaking11And11() throws Throwable  {
        // Given
        Element element = new Element("K");
        Namespace namespace = Namespace.getNamespace("K");
        
        // When
        String actualResult = Verifier.checkNamespaceCollision(namespace, element, 2100);
        
        // Then
        assertNotNull(actualResult);
        assertEquals("The namespace prefix \"\" collides with the element namespace prefix", actualResult);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1ThrowsNullPointerException() throws Throwable  {
        // Test that a null element throws a NullPointerException when checking for namespace collisions
        Attribute arg0 = new Attribute("xOQP73y", "xOQP73y");
        Namespace namespace = Namespace.XML_NAMESPACE;
        arg0.namespace = namespace;
        
        try {
        Verifier.checkNamespaceCollision(arg0, null, 468);
        fail("Expected exception not thrown");
        } catch (NullPointerException e) {
        // No message in exception (getMessage() returned null)
        verifyException("org.jdom2.Verifier", e);}
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking1And1ReturningNonEmptyString() throws Throwable  {
        // Given a namespace with a specific prefix and URL
        Namespace ns1 = Namespace.getNamespace("org.jdom2.Verifier", "https://www.example.com/");
        
        // And a namespace with the same prefix but a different URL
        Namespace ns2 = Namespace.getNamespace("org.jdom2.Verifier", "https://www.example.com/test");
        
        // When we check for namespace collision between these two namespaces
        String result = Verifier.checkNamespaceCollision(ns1, ns2);
        
        // Then the method should return a non-null value indicating that there is a collision
        assertNotNull(result);
        
        // And the returned value should be a descriptive message indicating that the namespace prefix collides with an attribute namespace prefix on the element
        assertEquals("The namespace prefix \"org.jdom2.Verifier\" collides with an attribute namespace prefix on the element", result);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking2Namespaces1() throws Throwable  {
        // Given
        Namespace noNamespace = Namespace.NO_NAMESPACE;
        Namespace xmlNamespace = Namespace.XML_NAMESPACE;
        
        // When
        String result = Verifier.checkNamespaceCollision(noNamespace, xmlNamespace);
        
        // Then
        assertNull(result);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceURI0() throws Throwable  {
        // No Comments were added
        String checkNamespaceURI = Verifier.checkNamespaceURI("\n");
        assertNotNull(checkNamespaceURI);
        assertEquals("Namespace URIs cannot begin with white-space", checkNamespaceURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceURI1() throws Throwable  {
        // Test that the method returns a null value when given a valid namespace URI
        String checkNamespaceURI = Verifier.checkNamespaceURI("http://www.example.com/");
        assertNull(checkNamespaceURI);
        
        // Test that the method throws an IllegalArgumentException when given a namespace URI with a hyphen at the beginning
        try {
        Verifier.checkNamespaceURI("-9.ccN.1_f;+kZQ17,(");
        fail("Expected IllegalArgumentException to be thrown");
        } catch (IllegalArgumentException e) {
        assertEquals("Namespace URIs cannot begin with a hyphen (-)", e.getMessage());}
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceURI2() throws Throwable  {
        // Given a string that contains a dollar sign ($) at the beginning
        String inputString = "$qtkc_EL=%xG/(5[3l0";
        
        // When the checkNamespaceURI method is called with this string
        String result = Verifier.checkNamespaceURI(inputString);
        
        // Then assert that the returned value is null, as it should not be a valid namespace URI
        assertNull(result);
        
        // And assert that an error message is returned, indicating that namespace URIs cannot begin with a dollar sign ($)
        assertEquals("Namespace URIs cannot begin with a dollar sign ($)", result);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceURI3() throws Throwable  {
        // Test that a namespace URI cannot begin with a number
        String checkNamespaceURI = Verifier.checkNamespaceURI("6w%~{*'0Z[");
        assertNotNull(checkNamespaceURI);
        // Assert that the namespace URI is not null and that it contains an error message
        assertEquals("Namespace URIs cannot begin with a number", checkNamespaceURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceURIWithEmptyString() throws Throwable  {
        // No Comments were added
        String checkNamespaceURI = Verifier.checkNamespaceURI("");
        assertNull(checkNamespaceURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceURIReturningNull() throws Throwable  {
        // Check that the method returns null when passed a valid namespace URI
        String checkNamespaceURI = Verifier.checkNamespaceURI("http://www.example.com");
        assertNull(checkNamespaceURI);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceURIWithNull() throws Throwable  {
        // Given a null value for the namespace URI
        String checkNamespaceURI = Verifier.checkNamespaceURI((String) null);
        
        // When the method is called with the null input
        assertNull(checkNamespaceURI);
        
        // Then, the method should return null as output
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespacePrefixReturningNonEmptyString() throws Throwable  {
        // Given the input value "xmlns"
        String inputValue = "xmlns";
        
        // When the method Verifier.checkNamespacePrefix() is called with the input value
        String checkNamespacePrefix = Verifier.checkNamespacePrefix(inputValue);
        
        // Then the output should be the result of the method call, which in this case is a non-null string
        assertNotNull(checkNamespacePrefix);
        
        // And the output string should contain the error message "Namespace prefixes cannot begin with \"xml\" in any combination of case"
        assertEquals("Namespace prefixes cannot begin with \"xml\" in any combination of case", checkNamespacePrefix);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespacePrefix0() throws Throwable  {
        // Check that the namespace prefix is valid
        String checkNamespacePrefix = Verifier.checkNamespacePrefix("tmns");
        
        // Assert that the prefix is null, indicating that it is not a valid namespace
        assertNull(checkNamespacePrefix);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespacePrefix1() throws Throwable  {
        // Test that the checkNamespacePrefix method returns null when given an invalid namespace prefix
        String checkNamespacePrefix = Verifier.checkNamespacePrefix("xM53N0D-");
        assertNull(checkNamespacePrefix);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespacePrefix2() throws Throwable  {
        // GIVEN a namespace with the prefix "Xqc_"
        String namespace = "http://example.com/Xqc_";
        // WHEN the method checkNamespacePrefix is called with the prefix
        String checkNamespacePrefix = Verifier.checkNamespacePrefix("Xqc_");
        // THEN it should return null as the prefix is not in the namespace
        assertNull(checkNamespacePrefix);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespacePrefixWithNull() throws Throwable  {
        // Test the case where the namespace prefix is null
        String checkNamespacePrefix = Verifier.checkNamespacePrefix((String) null);
        assertNull(checkNamespacePrefix);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCDATASectionWithNonEmptyString() throws Throwable  {
        // No Comments were added
        String checkCDATASection = Verifier.checkCDATASection("<![CDATA[]]>");
        assertNotNull(checkCDATASection);
        assertEquals("CDATA cannot internally contain a CDATA ending delimiter (]]>)", checkCDATASection);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCDATASectionReturningNull() throws Throwable  {
        // Check if the method returns null when given an empty string as input
        String checkCDATASection = Verifier.checkCDATASection("");
        assertNull(checkCDATASection);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCharacterDataReturningNull() throws Throwable  {
        // This test is checking that the "Verifier.checkCharacterData()" method returns null when passed an empty string.
        String checkCharacterData = Verifier.checkCharacterData("");
        assertNull(checkCharacterData);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckCDATASectionWithNull() throws Throwable  {
        // Given: A string variable 'checkCDATASection' with a null value
        String checkCDATASection = Verifier.checkCDATASection((String) null);
        
        // When: The 'checkCDATASection' variable is passed to the 'Verifier.checkCDATASection()' method
        assertNotNull(checkCDATASection);
        
        // Then: The method should return a string indicating that a null value is not a legal XML value
        assertEquals("A null is not a legal XML value", checkCDATASection);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckAttributeNameReturningNonEmptyString() throws Throwable  {
        // No Comments were added
        String checkAttributeName = Verifier.checkAttributeName("xmlns");
        assertEquals("An Attribute name may not be \"xmlns\"; use the Namespace class to manage namespaces", checkAttributeName);
        assertNotNull(checkAttributeName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void test2() throws Throwable  {
        // rollbacked to evosuite
        // Undeclared exception!
        try { 
          Namespace.getNamespace("XML name 'Cannot add null content' cannot contain the character \u201C\"\u201D", "XML name 'Cannot add null content' cannot contain the character \u201C\"\u201D");
          fail("Expecting exception: IllegalArgumentException");
        
        } catch(IllegalArgumentException e) {
           //
           // The name \"XML name 'Cannot add null content' cannot contain the character \u201C\"\u201D\" is not legal for JDOM/XML Namespace prefixs: XML name 'XML name 'Cannot add null content' cannot contain the character \u201C\"\u201D' cannot contain the character \"\u201D\".
           //
           verifyException("org.jdom2.Namespace", e);
        }
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void test3() throws Throwable  {
        Element element = null;
        try {
        element = new Element("1234-1987");
        fail("Expecting exception: IllegalArgumentException");
        } catch(IllegalArgumentException e) {
        // This block is executed if the constructor throws an IllegalArgumentException.
        verifyException("org.jdom2.Element", e);}
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckElementNameWithNull() throws Throwable  {
        // Arrange
        String elementName = null;
        
        // Act
        String checkElementName = Verifier.checkElementName(elementName);
        
        // Assert
        assertEquals("XML names cannot be null", checkElementName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testDecodeSurrogatePairReturningPositive() throws Throwable  {
        // No Comments were added
        int decodeSurrogatePair = Verifier.decodeSurrogatePair('\uFFF5', '\uFFF5');
        assertEquals(10549237, decodeSurrogatePair);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking1And1AndCheckNamespaceCollisionTaking1And11() throws Throwable  {
        // Given a new attribute "Hq" with type ENTITIES
        AttributeType arg2 = AttributeType.ENTITIES;
        Attribute arg0 = new Attribute("Hq", "Hq", arg2);
        
        // When the method checkNamespaceCollision is called on the attribute and an element as null argument
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(arg0, (Element) null);
        
        // Then assert that the method returns null, indicating no collision was found
        assertNull(checkNamespaceCollision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking11And1WithPositive() throws Throwable  {
        // Arrange
        Namespace namespaceNoName = Namespace.NO_NAMESPACE;
        Element elementJ = new Element("J", namespaceNoName);
        elementJ.addNamespaceDeclaration(namespaceNoName);
        
        // Act
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(namespaceNoName, elementJ, 34);
        
        // Assert
        assertNull(checkNamespaceCollision);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckElementNameWithEmptyString() throws Throwable  {
        // Test that an error is returned when the element name is empty
        String checkElementName = Verifier.checkElementName("");
        assertEquals("XML names cannot be empty", checkElementName);
    }
  
    @Test
    @Timeout(value = 4000 , unit = TimeUnit.MILLISECONDS)
    public void testCheckNamespaceCollisionTaking1And1AndCheckNamespaceCollisionTaking1And12() throws Throwable  {
        // rollbacked to evosuite
        Namespace arg0 = Namespace.XML_NAMESPACE;
        String checkNamespaceCollision = Verifier.checkNamespaceCollision(arg0, (List<?>) null);
        assertNull(checkNamespaceCollision);
    }
  }
  