[test] Improve struct size check for 32-bit and MSVC double alignment

Author: ellert

unittests/CppInterOp/ScopeReflectionTest.cpp

@@ -158,7 +158,8 @@ TEST(ScopeReflectionTest, SizeOf) {
   EXPECT_EQ(Cpp::SizeOf(Decls[4]), (size_t)0);
   EXPECT_EQ(Cpp::SizeOf(Decls[5]), (size_t)1);
   EXPECT_EQ(Cpp::SizeOf(Decls[6]), (size_t)4);
-  EXPECT_EQ(Cpp::SizeOf(Decls[7]), (size_t)16);
+  struct B {short a; double b;};
+  EXPECT_EQ(Cpp::SizeOf(Decls[7]), sizeof(B));
 }
 
 

unittests/CppInterOp/TypeReflectionTest.cpp

@@ -78,7 +78,8 @@ TEST(TypeReflectionTest, GetSizeOfType) {
   EXPECT_EQ(Cpp::GetSizeOfType(Cpp::GetVariableType(Decls[1])), 1);
   EXPECT_EQ(Cpp::GetSizeOfType(Cpp::GetVariableType(Decls[2])), 4);
   EXPECT_EQ(Cpp::GetSizeOfType(Cpp::GetVariableType(Decls[3])), 8);
-  EXPECT_EQ(Cpp::GetSizeOfType(Cpp::GetVariableType(Decls[4])), 16);
+  struct B {int a; double b;};
+  EXPECT_EQ(Cpp::GetSizeOfType(Cpp::GetVariableType(Decls[4])), sizeof(B));
   EXPECT_EQ(Cpp::GetSizeOfType(Cpp::GetTypeFromScope(Decls[5])), 0);
   EXPECT_EQ(Cpp::GetSizeOfType(Cpp::GetVariableType(Decls[6])),
             sizeof(intptr_t));