fix: adds xfail marks to tests that are known to fail (#189)

* fix: adds xfail marks to tests that are known to fail

* Update tests/compliance/date/test_date_compliance.py

* Update tests/compliance/date/test_date_compliance.py

Author: chalmerlowe

tests/compliance/date/test_date_compliance.py

@@ -90,6 +90,18 @@ def test_value_counts(self, all_data, dropna):
 
         self.assert_series_equal(result, expected)
 
+    def test_diff(self):
+        pytest.xfail(
+            reason="""Causes a breakage in the compliance test suite. Needs
+            further investigation. See issues 182, 183, 185."""
+        )
+
+    def test_hash_pandas_object(self):
+        pytest.xfail(
+            reason="""Causes a breakage in the compliance test suite. Needs
+            further investigation. See issues 182, 183, 185."""
+        )
+
 
 class TestParsing(base.BaseParsingTests):
     pass