cpp-reflection/test/context_test.cxx

//
//  context_test.cpp
//  reflection-test
//
//  Created by Sam Jaffe on 8/7/22.
//  Copyright © 2022 Sam Jaffe. All rights reserved.
//

#include "reflection/context.h"

#include "xcode_gtest_helper.h"

#include "reflection/reflection.h"

namespace {
struct Example {
  int a;
  int b;
};
}

namespace reflection {
INSTANTIATE_REFLECTION(Example);
}

REFLECTION(Example)
    .bind("a", &Example::a)
    .bind("b", &Example::b);

TEST(Context, CanWrap) {
  reflection::Context ctx{{"arg0", Example{.a = 0, .b = 1}}, {"arg1", Example{.a = 1, .b = 0}}};
  
  EXPECT_NO_THROW(ctx.get("arg0"));
  EXPECT_NO_THROW(ctx.get("arg1"));
  EXPECT_THROW(ctx.get("example"), std::out_of_range);
}

TEST(Context, CanBuildFromObjects) {
  Example const arg0{.a = 0, .b = 1};
  
  reflection::Context ctx{reflect(arg0)};
  EXPECT_NO_THROW(ctx.get("arg0"));
}

TEST(Context, CanAccessChildren) {
  Example const arg0{.a = 0, .b = 1};
  
  reflection::Context ctx{reflect(arg0)};

  reflection::Object b = ctx.get(std::vector{"arg0", "b"});
  EXPECT_THAT(int(b), 1);
}

TEST(Context, CanProvideMutableAccess) {
  Example arg0{.a = 0, .b = 1};
  
  reflection::Context ctx{reflect(arg0)};

  reflection::Object b = ctx.get(std::vector{"arg0", "b"});
  EXPECT_NO_THROW(b = 2);
  EXPECT_THAT(arg0.b, 2);
}

TEST(Context, CanMutateWithPairCtor) {
  Example arg0{.a = 0, .b = 1};
  
  reflection::Context ctx{{"arg0", arg0}};

  reflection::Object b = ctx.get(std::vector{"arg0", "b"});
  EXPECT_NO_THROW(b = 2);
  EXPECT_THAT(arg0.b, 2);
}