content: package com.anggastudio.printama.constants;
  
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.robolectric.RobolectricTestRunner;
  import org.robolectric.annotation.Config;
  
  import static org.junit.Assert.*;
  
  /**
   * Unit tests for PA (Printama Alignment) constants class
   * Tests all alignment constants and their values
   */
  @RunWith(RobolectricTestRunner.class)
  @Config(sdk = 28)
  public class PATest {
  
      @Test
      public void testAlignmentConstants() {
          // Test that all alignment constants have correct values
          assertEquals("LEFT alignment should be 0", 0, PA.LEFT);
          assertEquals("CENTER alignment should be -1", -1, PA.CENTER);
          assertEquals("RIGHT alignment should be -2", -2, PA.RIGHT);
      }
  
      @Test
      public void testConstantsArePublicStaticFinal() {
          // Test that constants are accessible as static fields
          // This test verifies the constants can be accessed without instantiation
          int left = PA.LEFT;
          int center = PA.CENTER;
          int right = PA.RIGHT;
          
          // Verify they are not null/undefined
          assertNotNull("LEFT constant should be accessible", (Integer) left);
          assertNotNull("CENTER constant should be accessible", (Integer) center);
          assertNotNull("RIGHT constant should be accessible", (Integer) right);
      }
  
      @Test
      public void testConstantsUniqueness() {
          // Test that all constants have unique values
          assertNotEquals("LEFT and CENTER should have different values", PA.LEFT, PA.CENTER);
          assertNotEquals("LEFT and RIGHT should have different values", PA.LEFT, PA.RIGHT);
          assertNotEquals("CENTER and RIGHT should have different values", PA.CENTER, PA.RIGHT);
      }
  
      @Test
      public void testConstantsRange() {
          // Test that constants are within expected range
          assertTrue("LEFT should be non-negative", PA.LEFT >= 0);
          assertTrue("CENTER should be negative", PA.CENTER < 0);
          assertTrue("RIGHT should be negative", PA.RIGHT < 0);
      }
  
      @Test
      public void testConstantsOrdering() {
          // Test logical ordering of alignment values
          assertTrue("LEFT should be greater than CENTER", PA.LEFT > PA.CENTER);
          assertTrue("LEFT should be greater than RIGHT", PA.LEFT > PA.RIGHT);
          assertTrue("CENTER should be greater than RIGHT", PA.CENTER > PA.RIGHT);
      }
  
      @Test
      public void testConstantsInSwitchStatement() {
          // Test that constants can be used in switch statements
          String result;
          
          switch (PA.LEFT) {
              case 0: // PA.LEFT
                  result = "left";
                  break;
              default:
                  result = "unknown";
                  break;
          }
          assertEquals("LEFT constant should work in switch", "left", result);
          
          switch (PA.CENTER) {
              case -1: // PA.CENTER
                  result = "center";
                  break;
              default:
                  result = "unknown";
                  break;
          }
          assertEquals("CENTER constant should work in switch", "center", result);
          
          switch (PA.RIGHT) {
              case -2: // PA.RIGHT
                  result = "right";
                  break;
              default:
                  result = "unknown";
                  break;
          }
          assertEquals("RIGHT constant should work in switch", "right", result);
      }
  
      @Test
      public void testConstantsInArrays() {
          // Test that constants can be used in arrays
          int[] alignments = {PA.LEFT, PA.CENTER, PA.RIGHT};
          
          assertEquals("Array should contain LEFT", PA.LEFT, alignments[0]);
          assertEquals("Array should contain CENTER", PA.CENTER, alignments[1]);
          assertEquals("Array should contain RIGHT", PA.RIGHT, alignments[2]);
      }
  
      @Test
      public void testConstantsComparison() {
          // Test comparison operations with constants
          assertTrue("LEFT == 0", PA.LEFT == 0);
          assertTrue("CENTER == -1", PA.CENTER == -1);
          assertTrue("RIGHT == -2", PA.RIGHT == -2);
          
          assertFalse("LEFT != CENTER", PA.LEFT == PA.CENTER);
          assertFalse("LEFT != RIGHT", PA.LEFT == PA.RIGHT);
          assertFalse("CENTER != RIGHT", PA.CENTER == PA.RIGHT);
      }
  
      @Test
      public void testConstantsAsMethodParameters() {
          // Test that constants can be passed as method parameters
          assertEquals("LEFT should be valid parameter", 0, getAlignmentValue(PA.LEFT));
          assertEquals("CENTER should be valid parameter", -1, getAlignmentValue(PA.CENTER));
          assertEquals("RIGHT should be valid parameter", -2, getAlignmentValue(PA.RIGHT));
      }
  
      @Test
      public void testConstantsImmutability() {
          // Test that constants maintain their values
          int originalLeft = PA.LEFT;
          int originalCenter = PA.CENTER;
          int originalRight = PA.RIGHT;
          
          // Simulate some operations that might affect constants
          performDummyOperations();
          
          // Verify constants haven't changed
          assertEquals("LEFT should remain unchanged", originalLeft, PA.LEFT);
          assertEquals("CENTER should remain unchanged", originalCenter, PA.CENTER);
          assertEquals("RIGHT should remain unchanged", originalRight, PA.RIGHT);
      }
  
      @Test
      public void testConstantsDocumentationValues() {
          // Test that constants match their documented values
          // Based on the documentation in PA.java
          assertEquals("LEFT should be 0 as documented", 0, PA.LEFT);
          assertEquals("CENTER should be -1 as documented", -1, PA.CENTER);
          assertEquals("RIGHT should be -2 as documented", -2, PA.RIGHT);
      }
  
      @Test
      public void testConstantsPerformance() {
          // Test that accessing constants is fast (no computation involved)
          long startTime = System.nanoTime();
          
          // Access constants multiple times
          for (int i = 0; i < 1000; i++) {
              int left = PA.LEFT;
              int center = PA.CENTER;
              int right = PA.RIGHT;
          }
          
          long endTime = System.nanoTime();
          long duration = endTime - startTime;
          
          // Should be very fast (less than 1ms for 1000 accesses)
          assertTrue("Constant access should be fast", duration < 1_000_000); // 1ms in nanoseconds
      }
  
      // Helper methods for testing
      private int getAlignmentValue(int alignment) {
          return alignment;
      }
      
      private void performDummyOperations() {
          // Simulate some operations
          int temp = 0;
          for (int i = 0; i < 100; i++) {
              temp += i;
          }
      }
  }