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Add test cases around map type parameter propagation #2261

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Add test cases around map type parameter propagation #2261

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26 changes: 26 additions & 0 deletions checker/internal/type_inference_context_test.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1048,6 +1048,32 @@ TEST(TypeInferenceContextTest,
EXPECT_FALSE(context.IsAssignable(param_r, TypeType(&arena, param_t)));
}

TEST(TypeInferenceContextTest,
TypeTypeAssignability_OccursCheck_MapTypeParamToTypeParam_ReturnsFalse) {
google::protobuf::Arena arena;
TypeInferenceContext context(&arena);

Type param_t =
context.InstantiateTypeParams(TypeType(&arena, TypeParamType("T")));
Type t_var = param_t.AsType()->GetType();
Type map_type = TypeType(&arena, MapType(&arena, StringType(), t_var));

EXPECT_FALSE(context.IsAssignable(map_type, param_t));
}

TEST(TypeInferenceContextTest,
TypeTypeAssignability_OccursCheck_TypeParamToMapTypeParam_ReturnsFalse) {
google::protobuf::Arena arena;
TypeInferenceContext context(&arena);

Type param_t =
context.InstantiateTypeParams(TypeType(&arena, TypeParamType("T")));
Type t_var = param_t.AsType()->GetType();
Type map_type = TypeType(&arena, MapType(&arena, StringType(), t_var));

EXPECT_FALSE(context.IsAssignable(param_t, map_type));
}

TEST(TypeInferenceContextTest,
TypeTypeOverloadResolution_TypeParamInTypeType_ResolvesReturnTypeInt) {
google::protobuf::Arena arena;
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