Added tests. Fixed include & exclude being switched

tests/test_download_library.py

@@ -0,0 +1,49 @@
+from humblebundle_downloader.download_library import DownloadLibrary
+
+
+def test_include_logic_has_values():
+    dl = DownloadLibrary(
+        'fake_cookie_path',
+        'fake_library_path',
+        ext_include=['pdf', 'EPub'],
+    )
+    assert dl._should_download_file_type('pdf') is True
+    assert dl._should_download_file_type('df') is False
+    assert dl._should_download_file_type('ePub') is True
+    assert dl._should_download_file_type('mobi') is False
+
+
+def test_include_logic_empty():
+    dl = DownloadLibrary(
+        'fake_cookie_path',
+        'fake_library_path',
+        ext_include=[],
+    )
+    assert dl._should_download_file_type('pdf') is True
+    assert dl._should_download_file_type('df') is True
+    assert dl._should_download_file_type('EPub') is True
+    assert dl._should_download_file_type('mobi') is True
+
+
+def test_exclude_logic_has_values():
+    dl = DownloadLibrary(
+        'fake_cookie_path',
+        'fake_library_path',
+        ext_exclude=['pdf', 'EPub'],
+    )
+    assert dl._should_download_file_type('pdf') is False
+    assert dl._should_download_file_type('df') is True
+    assert dl._should_download_file_type('ePub') is False
+    assert dl._should_download_file_type('mobi') is True
+
+
+def test_exclude_logic_empty():
+    dl = DownloadLibrary(
+        'fake_cookie_path',
+        'fake_library_path',
+        ext_exclude=[],
+    )
+    assert dl._should_download_file_type('pdf') is True
+    assert dl._should_download_file_type('df') is True
+    assert dl._should_download_file_type('EPub') is True
+    assert dl._should_download_file_type('mobi') is True