Merge pull request #195 from sturmianseq/fix

Removing state pollution in `parser_cache`

Author: isidentical

test/test_cache.py

@@ -185,6 +185,9 @@ def save(*args, **kwargs):
     was_called = False
 
     monkeypatch.setattr(cache, '_save_to_file_system', save)
-    with pytest.warns(Warning):
-        parse(path=__file__, cache=True, diff_cache=True)
-    assert was_called
+    try:
+        with pytest.warns(Warning):
+            parse(path=__file__, cache=True, diff_cache=True)
+        assert was_called
+    finally:
+        parser_cache.clear()