Add additional tests for immutable/mutable type cases and tuple vs. list iterators.

Author: ay0503

test-data/unit/check-expressions.test

@@ -2453,9 +2453,22 @@ T()  # E: "TypeVar" not callable
 [builtins fixtures/tuple.pyi]
 [typing fixtures/typing-full.pyi]
 
-[case testListComprehensionWithUnionTypeGenerator]
+[case testListComprehensionWithTupleUnionTypeGenerator]
 class A: pass
 class B: pass
 a = A()
 b = B()
-l3: list[A | B] = [x for x in [a, b]]
+l3: list[A | B] = [x for x in (a, b)]
+l3: list[A | B] = [x for x in [a, b]]
+
+[case testListComprehensionWithListUnionTypeGenerator]
+a = A()
+b = "foo"
+l3: list[A | str] = [x for x in (a, b)]
+l3: list[A | str] = [x for x in [a, b]]
+
+[case testListComprehensionWithImmutableTypeUnionTypeGenerator]
+a = 3.0
+b = 3
+l3: list[float | int] = [x for x in (a, b)]
+l3: list[float | int] = [x for x in [a, b]]