message: tests: check for function not found in WasmEngine
diff: @@ -25,6 +25,7 @@ TEST(wasm_engine, multi_i32_args_ret_i32)
  auto engine = engine_create_fn();
  ASSERT_TRUE(engine->parse(wasm));
  ASSERT_TRUE(engine->instantiate());
  + ASSERT_FALSE(engine->find_function("notfound").has_value());
  const auto func = engine->find_function("test");
  ASSERT_TRUE(func.has_value());
  // (52 - 21) * 0x1fffffff => 0xdfffffe1
  @@ -58,6 +59,7 @@ TEST(wasm_engine, multi_mixed_args_ret_i32)
  auto engine = engine_create_fn();
  ASSERT_TRUE(engine->parse(wasm));
  ASSERT_TRUE(engine->instantiate());
  + ASSERT_FALSE(engine->find_function("notfound").has_value());
  const auto func = engine->find_function("test");
  ASSERT_TRUE(func.has_value());
  // (52 - 21) * 0x1fffffff => 0xdfffffe1
  