Improve the test coverage of the C API -- Take 6

Author: Gnimuc

unittests/CppInterOp/FunctionReflectionTest.cpp

@@ -107,6 +107,20 @@ TEST(FunctionReflectionTest, GetClassMethods) {
   std::vector<Cpp::TCppFunction_t> methods5;
   Cpp::GetClassMethods(nullptr, methods5);
   EXPECT_EQ(methods5.size(), 0);
+
+  // C API
+  auto* I = clang_createInterpreterFromRawPtr(Cpp::GetInterpreter());
+  auto C_API_SHIM = [&](Cpp::TCppFunction_t method) {
+    auto Str = clang_getFunctionSignature(
+        make_scope(static_cast<clang::Decl*>(method), I));
+    auto Res = std::string(get_c_string(Str));
+    dispose_string(Str);
+    return Res;
+  };
+  EXPECT_EQ(C_API_SHIM(methods0[0]), "int A::f1(int a, int b)");
+  // Clean up resources
+  clang_Interpreter_takeInterpreterAsPtr(I);
+  clang_Interpreter_dispose(I);
 }
 
 TEST(FunctionReflectionTest, ConstructorInGetClassMethods) {