cpp-json/test/json_binder_object_test.cxx

//
//  json_binder_object.t.h
//  json
//
//  Created by Sam Jaffe on 2/27/17.
//

#include "json/json_binder.hpp"
#include <gmock/gmock.h>

using namespace json::binder;
using namespace json::parser;

using vec_t = std::vector<int>;
using map_t = std::map<std::string, vec_t>;

struct TestObject {
  int count;
  double average;
  map_t data;
};

bool operator==(TestObject const & lhs, TestObject const & rhs) {
  return lhs.count == rhs.count && lhs.average == rhs.average &&
         lhs.data == rhs.data;
}

class JsonBinderObjectTest : public ::testing::Test {
protected:
  static object_binder<TestObject> & GetBinder() {
    static object_binder<TestObject> val = object_binder<TestObject>()(
        "count", &TestObject::count)("average", &TestObject::average)(
        "data", direct_binder<TestObject, map_t>(&TestObject::data));
    return val;
  }
};

TEST_F(JsonBinderObjectTest, ParsesSuccessfully) {
  char data[] = "{ \"count\":10, \"average\":1.0, "
                "\"data\":{ \"key1\":[1, 2], \"key2\":[3, 4] }}";
  TestObject out = {0, 0.0, {}};
  TestObject expected = {10, 1.0, {{"key1", {1, 2}}, {"key2", {3, 4}}}};
  EXPECT_NO_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all));
  EXPECT_THAT(out, expected);
}

TEST_F(JsonBinderObjectTest, IgnoresUnknownKeysByDefault) {
  char data[] = "{ \"count\":10, \"average\":1.0, "
                "\"data\":{ \"key1\":[1, 2], \"key2\":[3, 4] }, "
                "\"lemon\":true}";
  TestObject out = {0, 0.0, {}};
  TestObject expected = {10, 1.0, {{"key1", {1, 2}}, {"key2", {3, 4}}}};
  EXPECT_NO_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all));
  EXPECT_THAT(out, expected);
}

TEST_F(JsonBinderObjectTest, ThrowsOnUnknownKeyWithSetting) {
  char data[] = "{ \"count\":10, \"average\":1.0, "
                "\"data\":{ \"key1\":[1, 2], \"key2\":[3, 4] }, "
                "\"lemon\":true}";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(
      parse(json::binder::bind(out, GetBinder()), data, disable_unknown_keys),
      json::malformed_json_exception);
}

TEST_F(JsonBinderObjectTest, AllowsMissingExpectedKeysByDefault) {
  char data[] = "{ \"count\":10, \"average\":1.0 }";
  TestObject out = {0, 0.0, {}};
  TestObject expected = {10, 1.0, {}};
  EXPECT_NO_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all));
  EXPECT_THAT(out, expected);
}

TEST_F(JsonBinderObjectTest, ThrowsOnMissingExpectedKeyWithSetting) {
  char data[] = "{ \"count\":10, \"average\":1.0 }";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(
      parse(json::binder::bind(out, GetBinder()), data, disable_missing_keys),
      json::malformed_json_exception);
}

TEST_F(JsonBinderObjectTest, ThrowsMalformedObjectKey) {
  char data[] = "{ count\":10, \"average\":1.0 }";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all),
               json::malformed_json_exception);
}

TEST_F(JsonBinderObjectTest, ThrowsMalformedObjectAssoc) {
  char data[] = "{ \"count\"=10, \"average\":1.0 }";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all),
               json::malformed_json_exception);
}

TEST_F(JsonBinderObjectTest, ThrowsOnMissingStartToken) {
  char data[] = "\"count\":10, \"average\":1.0, "
                "\"data\":{ \"key1\":[1, 2], \"key2\":[3, 4] } }";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all),
               json::malformed_json_exception);
}

TEST_F(JsonBinderObjectTest, ThrowsIfMissingValueForKey) {
  char data[] = "{ \"count\":10, \"average\":1.0, \"data\": }";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all),
               json::malformed_json_exception);
}

TEST_F(JsonBinderObjectTest, ThrowsOnMissingEndToken) {
  char data[] = "{ \"count\":10, \"average\":1.0, "
                "\"data\":{ \"key1\":[1, 2], \"key2\":[3, 4] }";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all),
               json::unterminated_json_exception);
}

TEST_F(JsonBinderObjectTest, ThrowsOnMissingEndTokenAfterUnknownKey) {
  char data[] = "{ \"count\":10, \"average\":1.0, "
                "\"data\":{ \"key1\":[1, 2], \"key2\":[3, 4] }, "
                "\"lemon\":{\"key\":false }";
  TestObject out = {0, 0.0, {}};
  EXPECT_THROW(parse(json::binder::bind(out, GetBinder()), data, allow_all),
               json::unterminated_json_exception);
}

std::string ify(double value) {
  std::stringstream ss;
  ss << std::fixed << value;
  return ss.str();
}

TEST_F(JsonBinderObjectTest, WritesBackOriginalObject) {
  std::string const dbl = ify(1.0);
  std::string const expected = "{\"average\":1.000000,\"count\":10,"
                               "\"data\":{\"key1\":[1,2],\"key2\":[3,4]}}";
  std::stringstream ss;
  TestObject const in = {10, 1.0, {{"key1", {1, 2}}, {"key2", {3, 4}}}};
  EXPECT_NO_THROW(write(json::binder::bind(in, GetBinder()), ss));
  EXPECT_THAT(ss.str(), expected);
}