update some tests for advanced paddings (#56)

test/test_model_modules/test_advanced_paddings.py

 import keras
-import tensorflow as tf
-import numpy as np
 import pytest
-import mock
-import os
 
 from src.model_modules.advanced_paddings import *
 
@@ -119,6 +115,7 @@ class TestReflectionPadding2D:
 
 
 class TestSymmerticPadding2D:
+
     @pytest.fixture
     def input_x(self):
         return keras.Input(shape=(10, 10, 3))
@@ -158,7 +155,7 @@ class TestSymmerticPadding2D:
         sym_pad = SymmetricPadding2D(padding=pad, name=layer_name)(input_x)
         assert sym_pad.get_shape().as_list() == [None, 12, 10, 3]
         assert sym_pad.name == 'SymPad_3x1/MirrorPad:0'
-        print(123)
+