Add test for LikeExpression.setEscape and LikeExpression.getStringExpression (#1568)

* Add test for LikeExpression.setEscape and LikeExpression.getStringExpression

* like + set escape test for $ as escape character

Author: lacinoire

src/test/java/net/sf/jsqlparser/expression/operators/relational/LikeExpressionTest.java

@@ -9,10 +9,14 @@
  */
 package net.sf.jsqlparser.expression.operators.relational;
 
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
+import net.sf.jsqlparser.JSQLParserException;
+import net.sf.jsqlparser.expression.Expression;
+import net.sf.jsqlparser.expression.StringValue;
+import net.sf.jsqlparser.parser.CCJSqlParserUtil;
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.*;
+
 /**
  *
  * @author Tobias Warneke (t.warneke@gmx.net)
@@ -25,4 +29,15 @@ public void testLikeNotIssue660() {
         assertFalse(instance.isNot());
         assertTrue(instance.withNot(true).isNot());
     }
+
+    @Test
+    public void testSetEscapeAndGetStringExpression() throws JSQLParserException {
+        LikeExpression instance  = (LikeExpression) CCJSqlParserUtil.parseExpression("name LIKE 'J%$_%'");
+        // escape character should be $
+        Expression instance2 = new StringValue("$");
+        instance.setEscape(instance2);
+
+        // match all records with names that start with letter ’J’ and have the ’_’ character in them
+        assertEquals("name LIKE 'J%$_%' ESCAPE '$'", instance.toString());
+    }
 }