Fix RFC822 filters + More tests (#257)

* Make rfc822 filters compatible with Windows systems.

.strftime() is relative to the system it's being run on.
UNIX has '%s' for seconds since the EPOCH, Windows doesn't (ValueError).
Solution: use .timestamp() to achieve the same result on both platforms.
This also allows us to drop the float() around it, since it returns a float.

* Start testing filters

* Add placeholders for more tests

* Make 'tests' folder a Python package

Now you can run tests with just `pytest tests`

* Update readme and travis config

* Test timesince()

* Update and organize .gitignore

Deleted: (nothing)
Added: Coverage files, .idea\

* Test filter_truthy, category_name

* Tests for backend.py

* Tests for bencode.py

* Move (empty) test_models.py to tests package

* Tests for utils.py

* Fixes for flattenDict

* Change name to `flatten_dict`
* `newkey` was assigned but never used

* Add a helper class for testing

* Show coverage on Travis

(only Travis for now...)

* Remove IDE

* Use correct assert functions

* Update README.md

tests/__init__.py

@@ -0,0 +1,36 @@
+""" Sets up helper class for testing """
+
+import os
+import unittest
+
+from nyaa import app
+
+USE_MYSQL = True
+
+
+class NyaaTestCase(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        app.config['TESTING'] = True
+        cls.app_context = app.app_context()
+
+        # Use a seperate database for testing
+        # if USE_MYSQL:
+        #     cls.db_name = 'nyaav2_tests'
+        #     db_uri = 'mysql://root:@localhost/{}?charset=utf8mb4'.format(cls.db_name)
+        # else:
+        #     cls.db_name = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'test.db')
+        #     db_uri = 'sqlite:///{}?check_same_thread=False'.format(cls.db_name)
+
+        # if not os.environ.get('TRAVIS'):  # Travis doesn't need a seperate DB
+        #     app.config['USE_MYSQL'] = USE_MYSQL
+        #     app.config['SQLALCHEMY_DATABASE_URI'] = db_uri
+
+        with cls.app_context:
+            cls.app = app.test_client()
+
+    @classmethod
+    def tearDownClass(cls):
+        with cls.app_context:
+            pass