Merge remote-tracking branch 'origin/pandas-dev#30324' into pandas-dev#30324

Author: naomi172839

pandas/tests/generic/test_generic.py

@@ -947,3 +947,21 @@ def test_axis_classmethods(self, box):
             assert obj._get_axis_number(v) == box._get_axis_number(v)
             assert obj._get_axis_name(v) == box._get_axis_name(v)
             assert obj._get_block_manager_axis(v) == box._get_block_manager_axis(v)
+
+    # Tests that the ignore keyword causes the intended functionality
+    def test_astype_ignores(self):
+        df = pd.DataFrame({"a": [1, 2, 3]})
+        df_validation = pd.DataFrame({"a": [1, 2, 3]})
+
+        # Tests that a KeyError is raised when raise is explicitly declared
+        with pytest.raises(KeyError):
+            df.astype({"b": str}, errors="raise")
+
+        # Tests that a KeyError is raised when no argument is declared
+        with pytest.raises(KeyError):
+            df.astype({"b": str})
+
+        # Tests that no KeyError is thrown if ignore is true.
+        # Ensures there is no change to the initial DataFrame.
+        df.astype({"b": str}, errors="ignore")
+        assert df.equals(df_validation)