@Test
public void testExecute_success() throws Exception {

	File tf = this.folder.newFile();
	Assert.assertEquals( 0, tf.length());
	AppendCommandExecution exec = buildExecutor( "append this into " + tf.getAbsolutePath());
	exec.execute();
	Assert.assertNotSame( 0, tf.length());
	Assert.assertEquals( "this", Utils.readFileContent( tf ));
	exec.execute();
	Assert.assertEquals( "this\nthis", Utils.readFileContent( tf ));
	exec = buildExecutor( "append that into " + tf.getAbsolutePath());
	exec.execute();
	Assert.assertEquals( "this\nthis\nthat", Utils.readFileContent( tf ));
}