Add unit tests for the functions in utils.py

.travis.yml

@@ -6,3 +6,4 @@ install:
   - pip install -r test-requirements.txt
 script:
   - flake8 .
+  - pytest ./tests/test_*.py

autowebcompat/utils.py

@@ -70,13 +70,13 @@ def prepare_images():
 images = {}
 
 
-def load_image(fname):
+def load_image(fname, parent_dir='data_resized'):
     global images
 
     if fname in images:
         return images[fname]
 
-    img = load_img(os.path.join('data_resized', fname), target_size=(32, 24))
+    img = load_img(os.path.join(parent_dir, fname), target_size=(32, 24))
     x = img_to_array(img, data_format=keras.backend.image_data_format())
 
     images[fname] = x

tests/test_utils.py

@@ -0,0 +1,40 @@
+import os
+from tempfile import TemporaryDirectory
+import numpy as np
+from PIL import Image
+from autowebcompat import utils
+
+
+def test_get_bugs():
+    bugs = utils.get_bugs()
+    assert(isinstance(bugs, list))
+
+
+def test_mkdir():
+    d = TemporaryDirectory()
+    direc_path = d.name + "/test"
+    utils.mkdir(direc_path)
+    assert(os.path.isdir(direc_path))
+    utils.mkdir(direc_path)
+
+
+def test_load_image(tmpdir):
+    d = TemporaryDirectory()
+    img = Image.new("RGB", (30, 30))
+    img.save(d.name + "/Image.jpg")
+    img = utils.load_image("Image.jpg", d.name)
+    assert(isinstance(img, np.ndarray))
+    assert(img.shape == (32, 24, 3))
+
+
+def test_read_labels():
+    labels = utils.read_labels(file_name='labels.csv')
+    assert(isinstance(labels, dict))
+
+
+def test_write_labels():
+    label = {1: 1, 2: 2}
+    d = TemporaryDirectory()
+    file_path = d.name + "/test.csv"
+    utils.write_labels(label, file_name=file_path)
+    assert(os.path.exists(file_path))