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  package org.apache.cayenne.exp;
  
  import static org.junit.Assert.assertEquals;
  
  import org.apache.cayenne.exp.parser.ASTLike;
  import org.apache.cayenne.exp.parser.ASTObjPath;
  import org.apache.cayenne.exp.parser.PatternMatchNode;
  import org.junit.Test;
  
  public class LikeExpressionHelperTest {
  
  	@Test
  	public void testEscape_NoEscapeChars() {
  
  		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "abc");
  		LikeExpressionHelper.escape(node);
  		assertEquals("abc", node.getOperand(1));
  		assertEquals(0, node.getEscapeChar());
  	}
  	
  	@Test
  	public void testEscape_OneChar() {
  
  		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "ab_c");
  		LikeExpressionHelper.escape(node);
  		assertEquals("ab!_c", node.getOperand(1));
  		assertEquals('!', node.getEscapeChar());
  	}
  	
  	@Test
  	public void testEscape_TwoChars() {
  
  		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "ab_c_");
  		LikeExpressionHelper.escape(node);
  		assertEquals("ab!_c!_", node.getOperand(1));
  		assertEquals('!', node.getEscapeChar());
  	}
  	
  	@Test
  	public void testEscape_TwoChars_Mix() {
  
  		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "ab%c_");
  		LikeExpressionHelper.escape(node);
  		assertEquals("ab!%c!_", node.getOperand(1));
  		assertEquals('!', node.getEscapeChar());
  	}
  	
  	@Test
  	public void testEscape_AltEscapeChar1() {
  
  		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "a!%c");
  		LikeExpressionHelper.escape(node);
  		assertEquals("a!#%c", node.getOperand(1));
  		assertEquals('#', node.getEscapeChar());
  	}
  	
  	@Test
  	public void testEscape_AltEscapeChar2() {
  
  		PatternMatchNode node = new ASTLike(new ASTObjPath("x"), "a!%c#_");
  		LikeExpressionHelper.escape(node);
  		assertEquals("a!$%c#$_", node.getOperand(1));
  		assertEquals('$', node.getEscapeChar());
  	}
  }
  