@Test
public void notExistentFileTest() {

    XmlIndentation xmlIndentation = new XmlIndentation().relative("cake.xml");
    TUExecutionResult executionResult = xmlIndentation.execution(transformedAppFolder, transformationContext);
    Assert.assertEquals(executionResult.getType(), TUExecutionResult.Type.ERROR);
    Assert.assertEquals(executionResult.getException().getClass(), TransformationUtilityException.class);
    Assert.assertEquals(executionResult.getException().getMessage(), "File cake.xml does not exist");
    Assert.assertNull(executionResult.getValue());
}