Code review comment: Since this is a negative test case, add `-negative` part to the file name.

Code under review:
public void testParseMainFuncWithoutName() {
        CompileResult result = BCompileUtil.compile("test-src/parser/func-without-name-negative.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '{'. expecting {'[', '?', '|', Identifier}", 1, 30);
        BAssertUtil.validateError(result, 1, "mismatched input ';'. expecting '='", 2, 7);
    }

    /**
     * Test mismatched input. i.e. {@link org.antlr.v4.runtime.InputMismatchException}
     */

    @Test
    public void testServiceWithoutResourceParams() {
        CompileResult result = BCompileUtil.compile("test-src/parser/service-without-resource-params-negative.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '{'. expecting '('", 9, 29);
    }

    @Test
    public void testParseMainFuncWithoutParams() {
        CompileResult result = BCompileUtil.compile("test-src/parser/func-without-params-negative.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '{'. expecting '('", 1, 15);
    }

    @Test
    public void testObjectAttachedFunctionWithInvalidSyntax() {
        CompileResult result = BCompileUtil.compile("test-src/parser/object-attached-func-with-invalid-syntax.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '.'. expecting '('", 6, 17);
    }

    @Test
    public void testResourceWithReply() {
        CompileResult result = BCompileUtil.compile("test-src/parser/resource-with-reply-negative.bal");
        BAssertUtil.validateError(result, 0, "undefined symbol 'reply'", 6, 5);
    }

    

    public void testTokenRecognition() {
        CompileResult result = BCompileUtil.compile("test-src/parser/resource-with-empty-reply-negative.bal");
        BAssertUtil.validateError(result, 0, "token recognition error at: '\\'", 3, 5);
        BAssertUtil.validateError(result, 0, "token recognition error at: '*'", 4, 15);
    }

    @Test
    public void testListenerDeclarationWithoutType() {
        CompileResult result = BCompileUtil.compile("test-src/parser/listener-declaration-without-type.bal");
        BAssertUtil.validateError(result, 0, "mismatched input 'listener'. expecting 'function'", 7, 9);
    }
}

Line commented on: CompileResult result = BCompileUtil.compile("test-src/parser/listener-declaration-without-type.bal");

Revised code:
public void testParseMainFuncWithoutName() {
        CompileResult result = BCompileUtil.compile("test-src/parser/func-without-name-negative.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '{'. expecting {'[', '?', '|', Identifier}", 1, 30);
        BAssertUtil.validateError(result, 1, "mismatched input ';'. expecting '='", 2, 7);
    }

    /**
     * Test mismatched input. i.e. {@link org.antlr.v4.runtime.InputMismatchException}
     */

    @Test
    public void testServiceWithoutResourceParams() {
        CompileResult result = BCompileUtil.compile("test-src/parser/service-without-resource-params-negative.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '{'. expecting '('", 9, 29);
    }

    @Test
    public void testParseMainFuncWithoutParams() {
        CompileResult result = BCompileUtil.compile("test-src/parser/func-without-params-negative.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '{'. expecting '('", 1, 15);
    }

    @Test
    public void testObjectAttachedFunctionWithInvalidSyntax() {
        CompileResult result = BCompileUtil.compile("test-src/parser/object-attached-func-with-invalid-syntax.bal");
        BAssertUtil.validateError(result, 0, "mismatched input '.'. expecting '('", 6, 17);
    }

    @Test
    public void testResourceWithReply() {
        CompileResult result = BCompileUtil.compile("test-src/parser/resource-with-reply-negative.bal");
        BAssertUtil.validateError(result, 0, "undefined symbol 'reply'", 6, 5);
    }

    

    public void testTokenRecognition() {
        CompileResult result = BCompileUtil.compile("test-src/parser/resource-with-empty-reply-negative.bal");
        BAssertUtil.validateError(result, 0, "token recognition error at: '\\'", 3, 5);
        BAssertUtil.validateError(result, 0, "token recognition error at: '*'", 4, 15);
    }

    @Test
    public void testListenerDeclarationWithDefinedDifferentType() {
        CompileResult result = BCompileUtil.compile("test-src/parser/listener_declaration_type_reuse_negative.bal");
        BAssertUtil.validateError(result, 0, "incompatible types: expected 'ballerina/http:MockListener', found " +
                "'int'", 22, 9);
        BAssertUtil.validateError(result, 1, "incompatible types: expected 'int', found " +
                "'ballerina/http:MockListener'", 23, 9);
        BAssertUtil.validateError(result, 2, "incompatible types: expected 'lang.object:Listener', found 'int'", 26,
                                  14);
        BAssertUtil.validateError(result, 3, "incompatible types: expected 'lang.object:Listener', found 'Person'",
                                  29, 24);
        BAssertUtil.validateError(result, 4, "incompatible types: expected 'lang.object:Listener', found 'other'", 31
                , 23);
    }
}