@Test
public void notXmlFileTest() {

    XmlIndentation xmlIndentation = new XmlIndentation().relative("blah/bli");
    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 blah/bli is not recognized as a valid XML file");
    Assert.assertNull(executionResult.getValue());
}