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Test is_proper_subtype with string literals #14011

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25 changes: 25 additions & 0 deletions mypy/test/testtypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -376,6 +376,31 @@ def test_is_proper_subtype_and_subtype_literal_types(self) -> None:
assert is_subtype(lit1, fx.anyt)
assert is_subtype(fx.anyt, lit1)

def test_is_proper_subtype_literal_str_types(self) -> None:
fx = self.fx

lit_foo = LiteralType("foo", fx.str_type)
assert is_proper_subtype(lit_foo, lit_foo)

lit_also_foo = LiteralType("foo", fx.str_type)
assert is_proper_subtype(lit_foo, lit_also_foo)
assert is_proper_subtype(lit_also_foo, lit_foo)

lit_bar = LiteralType("bar", fx.str_type)
assert not is_proper_subtype(lit_foo, lit_bar)
assert not is_proper_subtype(lit_bar, lit_foo)

str_type = fx.str_type
assert is_proper_subtype(lit_foo, str_type)
assert not is_proper_subtype(str_type, lit_foo)

lit_foo_context_sensitive = Instance(fx.str_type_info, [], last_known_value=lit_foo)
assert is_proper_subtype(lit_foo_context_sensitive, str_type)
assert is_proper_subtype(str_type, lit_foo_context_sensitive)

assert not is_proper_subtype(lit_foo_context_sensitive, lit_bar)
assert is_proper_subtype(lit_bar, lit_foo_context_sensitive)

def test_subtype_aliases(self) -> None:
A1, _ = self.fx.def_alias_1(self.fx.a)
AA1, _ = self.fx.def_alias_1(self.fx.a)
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