Add polyline codec tests

tests/test_polyline_codec.py

@@ -0,0 +1,70 @@
+import unittest
+
+from mapbox.polyline.codec import PolylineCodec
+
+
+class PolylineCodecTestCase(unittest.TestCase):
+    def setUp(self):
+        self.codec = PolylineCodec()
+
+    def test_decode_multiple_points(self):
+        d = self.codec.decode('gu`wFnfys@???nKgE??gE?????oK????fE??fE')
+        self.assertEqual(d, [
+            (40.641, -8.654),
+            (40.641, -8.654),
+            (40.641, -8.656),
+            (40.642, -8.656),
+            (40.642, -8.655),
+            (40.642, -8.655),
+            (40.642, -8.655),
+            (40.642, -8.653),
+            (40.642, -8.653),
+            (40.642, -8.653),
+            (40.641, -8.653),
+            (40.641, -8.654)
+        ])
+
+    def test_decode_official_example(self):
+        d = self.codec.decode('_p~iF~ps|U_ulLnnqC_mqNvxq`@')
+        self.assertEqual(d, [
+            (38.500, -120.200),
+            (40.700, -120.950),
+            (43.252, -126.453)
+        ])
+
+    def test_decode_single_point(self):
+        d = self.codec.decode('gu`wFf`ys@')
+        self.assertEqual(d, [
+            (40.641, -8.653)
+        ])
+
+    def test_encode_multiple_points(self):
+        e = self.codec.encode([
+            (40.641, -8.654),
+            (40.641, -8.654),
+            (40.641, -8.656),
+            (40.642, -8.656),
+            (40.642, -8.655),
+            (40.642, -8.655),
+            (40.642, -8.655),
+            (40.642, -8.653),
+            (40.642, -8.653),
+            (40.642, -8.653),
+            (40.641, -8.653),
+            (40.641, -8.654)
+        ])
+        self.assertEqual(e, 'gu`wFnfys@???nKgE??gE?????oK????fE??fE')
+
+    def test_encode_official_example(self):
+        e = self.codec.encode([
+            (38.500, -120.200),
+            (40.700, -120.950),
+            (43.252, -126.453)
+        ])
+        self.assertEqual(e, '_p~iF~ps|U_ulLnnqC_mqNvxq`@')
+
+    def test_encode_single_point(self):
+        e = self.codec.encode([
+            (40.641, -8.653)
+        ])
+        self.assertEqual(e, 'gu`wFf`ys@')