Patch to increase test coverage (#8902)

* no need to disable vis test in python 3.x
this unit test works in my environment

* add test for RemoteMonitor

* install pydot and graphvis for python 3.x

* monkey patch requests.post
remove unnecessary code

* travis fix

* pep8 fix

* add test for _remove_long_seq

* add test for HDF5Matrix and ask_to_proceed_with_overwrite

* typo

.travis.yml

@@ -66,9 +66,7 @@ install:
     fi
 
   # install pydot for visualization tests
-  - if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
-      conda install pydot graphviz;
-    fi
+  - conda install pydot graphviz
 
   # exclude different backends to measure a coverage for the designated backend only
   - if [[ "$KERAS_BACKEND" != "tensorflow" ]]; then

setup.py

@@ -21,7 +21,8 @@
                     'pytest-pep8',
                     'pytest-xdist',
                     'pytest-cov',
-                    'pandas'],
+                    'pandas',
+                    'requests'],
       },
       classifiers=[
           'Development Status :: 5 - Production/Stable',

tests/keras/preprocessing/sequence_test.py

@@ -6,6 +6,7 @@
 from keras.preprocessing.sequence import pad_sequences
 from keras.preprocessing.sequence import make_sampling_table
 from keras.preprocessing.sequence import skipgrams
+from keras.preprocessing.sequence import _remove_long_seq
 
 
 def test_pad_sequences():
@@ -82,5 +83,17 @@ def test_skipgrams():
         assert len(l) == 2
 
 
+def test_remove_long_seq():
+    maxlen = 5
+    seq = [
+        [1, 2, 3],
+        [1, 2, 3, 4, 5, 6],
+    ]
+    label = ['a', 'b']
+    new_seq, new_label = _remove_long_seq(maxlen, seq, label)
+    assert new_seq == [[1, 2, 3]]
+    assert new_label == ['a']
+
+
 if __name__ == '__main__':
     pytest.main([__file__])

tests/keras/test_callbacks.py

@@ -17,6 +17,11 @@
 from keras.utils.test_utils import keras_test
 from keras import backend as K
 from keras.utils import np_utils
+try:
+    from unittest.mock import patch
+except:
+    from mock import patch
+
 
 input_dim = 2
 num_hidden = 4
@@ -787,5 +792,27 @@ def test_TensorBoard_with_ReduceLROnPlateau(tmpdir):
     assert not tmpdir.listdir()
 
 
+@keras_test
+def tests_RemoteMonitor():
+    (X_train, y_train), (X_test, y_test) = get_test_data(num_train=train_samples,
+                                                         num_test=test_samples,
+                                                         input_shape=(input_dim,),
+                                                         classification=True,
+                                                         num_classes=num_classes)
+    y_test = np_utils.to_categorical(y_test)
+    y_train = np_utils.to_categorical(y_train)
+    model = Sequential()
+    model.add(Dense(num_hidden, input_dim=input_dim, activation='relu'))
+    model.add(Dense(num_classes, activation='softmax'))
+    model.compile(loss='categorical_crossentropy',
+                  optimizer='rmsprop',
+                  metrics=['accuracy'])
+    cbks = [callbacks.RemoteMonitor()]
+
+    with patch('requests.post'):
+        model.fit(X_train, y_train, batch_size=batch_size,
+                  validation_data=(X_test, y_test), callbacks=cbks, epochs=1)
+
+
 if __name__ == '__main__':
     pytest.main([__file__])

tests/keras/utils/io_utils_test.py

@@ -1,13 +1,19 @@
 '''Tests for functions in io_utils.py.
 '''
 import os
+import sys
 import pytest
 from keras.models import Sequential
 from keras.layers import Dense
 from keras.utils.io_utils import HDF5Matrix
+from keras.utils.io_utils import ask_to_proceed_with_overwrite
 import numpy as np
 import warnings
 import h5py
+try:
+    from unittest.mock import patch
+except:
+    from mock import patch
 
 
 @pytest.fixture
@@ -76,8 +82,45 @@ def test_io_utils(in_tmpdir):
     # test slicing for shortened array
     assert len(X_train[0:]) == len(X_train), 'Incorrect shape for sliced data'
 
+    # test __getitem__
+    with pytest.raises(IndexError):
+        X_train[1000]
+    with pytest.raises(IndexError):
+        X_train[1000:1001]
+    with pytest.raises(IndexError):
+        X_train[[1000, 1001]]
+    with pytest.raises(IndexError):
+        X_train[np.array([1000])]
+    with pytest.raises(IndexError):
+        X_train[None]
+    assert (X_train[0] == X_train[:1][0]).all()
+    assert (X_train[[0, 1]] == X_train[:2]).all()
+    assert (X_train[np.array([0, 1])] == X_train[:2]).all()
+
+    # test normalizer
+    normalizer = lambda x: x + 1
+    normalized_X_train = HDF5Matrix(h5_path, 'my_data', start=0, end=150, normalizer=normalizer)
+    assert np.isclose(normalized_X_train[0][0], X_train[0][0] + 1)
+
     os.remove(h5_path)
 
 
+def test_ask_to_proceed_with_overwrite():
+    if sys.version_info[:2] <= (2, 7):
+        with patch('__builtin__.raw_input') as mock:
+            mock.return_value = 'y'
+            assert ask_to_proceed_with_overwrite('/tmp/not_exists')
+
+            mock.return_value = 'n'
+            assert not ask_to_proceed_with_overwrite('/tmp/not_exists')
+    else:
+        with patch('builtins.input') as mock:
+            mock.return_value = 'y'
+            assert ask_to_proceed_with_overwrite('/tmp/not_exists')
+
+            mock.return_value = 'n'
+            assert not ask_to_proceed_with_overwrite('/tmp/not_exists')
+
+
 if __name__ == '__main__':
     pytest.main([__file__])

tests/keras/utils/vis_utils_test.py

@@ -11,7 +11,6 @@
 from keras.utils import vis_utils
 
 
-@pytest.mark.skipif(sys.version_info > (3, 0), reason='pydot-ng currently supports python 3.4')
 def test_plot_model():
     model = Sequential()
     model.add(Conv2D(filters=2, kernel_size=(2, 3), input_shape=(3, 5, 5), name='conv'))