add imdb full import mode

tests/test_imdb.py

@@ -0,0 +1,19 @@
+import pytest
+from unwind.imdb import imdb_rating_from_score, score_from_imdb_rating
+
+
+@pytest.mark.parametrize("rating", (x / 10 for x in range(10, 101)))
+def test_rating_conversion(rating):
+    assert rating == imdb_rating_from_score(score_from_imdb_rating(rating))
+
+
+@pytest.mark.parametrize("score", range(0, 101))
+def test_score_conversion(score):
+    # Because our score covers 101 discrete values and IMDb's rating only 91
+    # discrete values, the mapping is non-injective, i.e. 10 values can't be
+    # mapped uniquely.
+    non_injective = set(range(5, 100, 10))
+    if score in non_injective:
+        pytest.skip(f"Score cannot be mapped back correctly: {score}")
+
+    assert score == score_from_imdb_rating(imdb_rating_from_score(score))