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.venv/Lib/site-packages/pandas/tests/indexes/test_frozen.py

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+import re
+
+import pytest
+
+from pandas.core.indexes.frozen import FrozenList
+
+
+class TestFrozenList:
+
+    unicode_container = FrozenList(["\u05d0", "\u05d1", "c"])
+
+    def setup_method(self, _):
+        self.lst = [1, 2, 3, 4, 5]
+        self.container = FrozenList(self.lst)
+
+    def check_mutable_error(self, *args, **kwargs):
+        # Pass whatever function you normally would to pytest.raises
+        # (after the Exception kind).
+        mutable_regex = re.compile("does not support mutable operations")
+        msg = "'(_s)?re.(SRE_)?Pattern' object is not callable"
+        with pytest.raises(TypeError, match=msg):
+            mutable_regex(*args, **kwargs)
+
+    def test_no_mutable_funcs(self):
+        def setitem():
+            self.container[0] = 5
+
+        self.check_mutable_error(setitem)
+
+        def setslice():
+            self.container[1:2] = 3
+
+        self.check_mutable_error(setslice)
+
+        def delitem():
+            del self.container[0]
+
+        self.check_mutable_error(delitem)
+
+        def delslice():
+            del self.container[0:3]
+
+        self.check_mutable_error(delslice)
+
+        mutable_methods = ("extend", "pop", "remove", "insert")
+
+        for meth in mutable_methods:
+            self.check_mutable_error(getattr(self.container, meth))
+
+    def test_slicing_maintains_type(self):
+        result = self.container[1:2]
+        expected = self.lst[1:2]
+        self.check_result(result, expected)
+
+    def check_result(self, result, expected):
+        assert isinstance(result, FrozenList)
+        assert result == expected
+
+    def test_string_methods_dont_fail(self):
+        repr(self.container)
+        str(self.container)
+        bytes(self.container)
+
+    def test_tricky_container(self):
+        repr(self.unicode_container)
+        str(self.unicode_container)
+
+    def test_add(self):
+        result = self.container + (1, 2, 3)
+        expected = FrozenList(self.lst + [1, 2, 3])
+        self.check_result(result, expected)
+
+        result = (1, 2, 3) + self.container
+        expected = FrozenList([1, 2, 3] + self.lst)
+        self.check_result(result, expected)
+
+    def test_iadd(self):
+        q = r = self.container
+
+        q += [5]
+        self.check_result(q, self.lst + [5])
+
+        # Other shouldn't be mutated.
+        self.check_result(r, self.lst)
+
+    def test_union(self):
+        result = self.container.union((1, 2, 3))
+        expected = FrozenList(self.lst + [1, 2, 3])
+        self.check_result(result, expected)
+
+    def test_difference(self):
+        result = self.container.difference([2])
+        expected = FrozenList([1, 3, 4, 5])
+        self.check_result(result, expected)
+
+    def test_difference_dupe(self):
+        result = FrozenList([1, 2, 3, 2]).difference([2])
+        expected = FrozenList([1, 3])
+        self.check_result(result, expected)
+
+    def test_tricky_container_to_bytes_raises(self):
+        # GH 26447
+        msg = "^'str' object cannot be interpreted as an integer$"
+        with pytest.raises(TypeError, match=msg):
+            bytes(self.unicode_container)