Some xfaileds tests addeds for identify the bad comportment of isin func, related with issue 34125

Author: gabrielvf1

pandas/tests/frame/methods/test_isin.py

@@ -189,16 +189,3 @@ def test_isin_empty_datetimelike(self):
         tm.assert_frame_equal(result, expected)
         result = df1_td.isin(df3)
         tm.assert_frame_equal(result, expected)
-
-    def test_isin_int_df_string_search(self):
-        """Comparing df with int`s (1,2) with a string at isin() ("1")
-        -> should not match values because int 1 is not equal str 1"""
-        df = DataFrame({"values": [1, 2]})
-        result = df.isin(["1"])
-        expected_false = pd.DataFrame({"values": [False, False]})
-        tm.assert_frame_equal(result, expected_false)
-
-        # Comparing df with int`s with a int at isin() -> should be fine
-        result = df.isin([1])
-        expected_true = DataFrame({"values": [True, False]})
-        tm.assert_frame_equal(result, expected_true)

pandas/tests/test_algos.py

@@ -2374,3 +2374,30 @@ def test_index(self):
             dtype="timedelta64[ns]",
         )
         tm.assert_series_equal(algos.mode(idx), exp)
+
+    @pytest.mark.xfail(reason="problem related with issue #34125")
+    def test_isin_int_df_string_search(self):
+        """Comparing df with int`s (1,2) with a string at isin() ("1")
+        -> should not match values because int 1 is not equal str 1"""
+        df = pd.DataFrame({"values": [1, 2]})
+        result = df.isin(["1"])
+        expected_false = pd.DataFrame({"values": [False, False]})
+        tm.assert_frame_equal(result, expected_false)
+
+    @pytest.mark.xfail(reason="problem related with issue #34125")
+    def test_isin_nan_df_string_search(self):
+        """Comparing df with nan value (np.nan,2) with a string at isin() ("NaN")
+        -> should not match values because np.nan is not equal str NaN """
+        df = DataFrame({"values": [np.nan, 2]})
+        result = df.isin(["NaN"])
+        expected_false = pd.DataFrame({"values": [False, False]})
+        tm.assert_frame_equal(result, expected_false)
+
+    @pytest.mark.xfail(reason="problem related with issue #34125")
+    def test_isin_float_df_string_search(self):
+        """Comparing df with floats (1.4245,2.32441) with a string at isin() ("1.4245")
+        -> should not match values because float 1.4245 is not equal str 1.4245"""
+        df = DataFrame({"values": [1.4245, 2.32441]})
+        result = df.isin(["1.4245"])
+        expected_false = pd.DataFrame({"values": [False, False]})
+        tm.assert_frame_equal(result, expected_false)