Add unit tests

tests/test_rgbcx.py

@@ -0,0 +1,20 @@
+import unittest
+import python_rgbcx
+
+
+class MyTestCase(unittest.TestCase):
+    def setUp(self):
+        self.bc1_encoder = python_rgbcx.BC1Encoder()
+        self.image = b'\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\x55\x55\x55\xFF\xAA\xAA\xAA\xFF' \
+                     b'\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\x55\x55\x55\xFF\xAA\xAA\xAA\xFF' \
+                     b'\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\x55\x55\x55\xFF\xAA\xAA\xAA\xFF' \
+                     b'\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\x55\x55\x55\xFF\xAA\xAA\xAA\xFF'
+
+    def test_block_size(self):
+        out = self.bc1_encoder.encode_image(self.image, 4, 4)
+        self.assertEqual(self.bc1_encoder.block_size, 8, 'incorrect reported block size')
+        self.assertEqual(len(out), 8, 'incorrect returned block size')
+
+
+if __name__ == '__main__':
+    unittest.main()