How can I test a .tflite model to prove that it behaves as the original model using the same Test Data?

You may use TensorFlow Lite Python interpreter to test your tflite model.

It allows you to feed input data in python shell and read the output directly like you are just using a normal tensorflow model.

I have answered this question here.

And you can read this TensorFlow lite official guide for detailed information.

You can also use Netron to visualize your model. It allows you to load your .tflite file directly and inspect your model architecture and model weights.

There is a tflite_diff_example_test in the TensorFlow code base. It generates random data and feed the same data into TensorFlow & TensorFlow lite, then compare if the difference is within a small threshold.

You can to checkout TensorFlow code from Github, and run it with bazel:

bazel run //tensorflow/contrib/lite/testing:tflite_diff_example_test

then you'll see what arguments you need to pass.