cpp-logger/test/properties_test.cxx

//
//  properties_test.cpp
//  logger-test
//
//  Created by Sam Jaffe on 8/12/20.
//

#include "logger/properties.h"

#include <gmock/gmock.h>

#include "logger/exception.h"

namespace logging {
  void indent(int i, std::ostream * os) {
    while (i-- > 0) {
      (*os) << ' ' << ' ';
    }
  }
  void PrintTo(properties const & props, std::ostream * os, int level = 1) {
    switch (props.data.index()) {
    case 0:
      (*os) << '{' << '\n';
      for (auto & [k, v] : props.object()) {
        indent(level + 1, os);
        (*os) << k << ':' << ' ';
        PrintTo(v, os, level + 1);
      }
      (*os) << '\n';
      indent(level, os);
      (*os) << '}' << '\n';
      break;
    case 1:
      (*os) << '[' << '\n';
      for (auto & v : props.array()) {
        indent(level + 1, os);
        PrintTo(v, os, level + 1);
      }
      (*os) << '\n';
      indent(level, os);
      (*os) << ']' << '\n';
      break;
    case 2:
      (*os) << props.str();
      break;
    case 3:
      (*os) << int(props);
      break;
    case 4:
      (*os) << std::boolalpha << bool(props);
      break;
    default:
      (*os) << "null";
      break;
    }
  }
}

MATCHER(Valid, "") { return arg.data.valid(); }

MATCHER_P(Contains, key, "") { return arg.contains(key); }

MATCHER_P(IsOfType, type, "") { return arg.data.template is<decltype(type)>(); }

MATCHER_P(ArraySizeIs, size, "") {
  return arg.data.template is<logging::array_t>() && arg.array().size() == size;
}

template <typename T> auto IsOfType() { return IsOfType(T()); }

using namespace logging;
using namespace ::logging::property;

TEST(PropertiesTest, DefaultPropertyIsInvalidType) {
  EXPECT_THAT(properties(), testing::Not(Valid()));
}

TEST(PropertiesTest, CanStoreBoolean) {
  EXPECT_THAT(_v(true), IsOfType<bool>());
  EXPECT_THAT(_v(true), Valid());
}

TEST(PropertiesTest, CanStoreInteger) {
  EXPECT_THAT(_v(0), IsOfType<int>());
  EXPECT_THAT(_v(0), Valid());
}

TEST(PropertiesTest, CanStoreString) {
  EXPECT_THAT(_v("hello"), IsOfType<std::string>());
  EXPECT_THAT(_v("hello"), Valid());
}

TEST(PropertiesTest, CanStoreArray) {
  EXPECT_THAT(_arr({}), IsOfType<array_t>());
  EXPECT_THAT(_arr({}), Valid());
}

TEST(PropertiesTest, CanStoreObject) {
  EXPECT_THAT(_obj({}), IsOfType<object_t>());
  EXPECT_THAT(_obj({}), Valid());
}

TEST(PropertiesTest, ArrContainsReturnsTrueEvenWhenUnderlyingIsInvalid) {
  properties const props = _arr({{}});
  EXPECT_THAT(props, Contains(0));
  EXPECT_THAT(props[0ul], testing::Not(Valid()));
}

TEST(PropertiesTest, ObjContainsReturnsTrueEvenWhenUnderlyingIsInvalid) {
  properties const props = _obj({{"data", {}}});
  EXPECT_THAT(props, Contains("data"));
  EXPECT_THAT(props["data"], testing::Not(Valid()));
}

TEST(PropertiesTest, ContainsAlwaysFalseForNonContainer) {
  EXPECT_THAT(_v(true), testing::Not(Contains(0)));
  EXPECT_THAT(_v(true), testing::Not(Contains("")));
  EXPECT_THAT(_v(0), testing::Not(Contains(0)));
  EXPECT_THAT(_v(0), testing::Not(Contains("")));
  EXPECT_THAT(_v(""), testing::Not(Contains(0)));
  EXPECT_THAT(_v(""), testing::Not(Contains("")));
}

TEST(PropertiesTest, ArrayCannotContainKey) {
  properties const props = _arr({{}});
  EXPECT_THAT(props, testing::Not(Contains("")));
}

TEST(PropertiesTest, ObjectCannotContainIndex) {
  properties const props = _obj({{"data", {}}});
  EXPECT_THAT(props, testing::Not(Contains(0)));
}

TEST(PropertiesTest, MistypingWillThrow) {
  properties prop;
  // Avoid most vexing parse/unused variable
  EXPECT_THROW((void)bool(prop), invalid_property_type);
  EXPECT_THROW((void)int(prop), invalid_property_type);
  EXPECT_THROW(prop.str(), invalid_property_type);
  EXPECT_THROW(prop.array(), invalid_property_type);
  EXPECT_THROW(prop.object(), invalid_property_type);
}

TEST(PropertiesTest, IndexingNonContainerWillThrow) {
  properties prop;
  EXPECT_THROW(prop[0ul], invalid_property_type);
  EXPECT_THROW(prop[""], invalid_property_type);
}

TEST(PropertiesTest, IndexingContainerWithWrongTypeWillThrow) {
  EXPECT_THROW(_obj({{"", {}}})[0ul], invalid_property_type);
  EXPECT_THROW(_arr({{}})[""], invalid_property_type);
}

TEST(PropertiesTest, IndexingNonExistantPathWillThrouw) {
  EXPECT_THROW(_obj({{"", {}}})["data"], missing_property);
  EXPECT_THROW(_arr({{}})[1], missing_property);
}

properties const EXAMPLE_PROPERTIES =
    _obj({{"data", _obj({{"files", _arr({_v("a.txt")})},
                         {"config", _obj({{"append", _v(false)}})}})}});

TEST(PropertiesTest, MergeWithWillNotAddNewProperties) {
  properties const input =
      _obj({{"data", _obj({{"config", _obj({{"compact", _v(true)}})}})}});
  properties const output = EXAMPLE_PROPERTIES.mergedWith(input);
  EXPECT_THAT(output, Contains("data"));
  EXPECT_THAT(output["data"], Contains("files"));
  EXPECT_THAT(output["data"]["files"], ArraySizeIs(1));
  EXPECT_THAT(output["data"], Contains("config"));
  EXPECT_THAT(output["data"]["config"], Contains("append"));
  EXPECT_THAT(output["data"]["config"], testing::Not(Contains("compact")));
}

TEST(PropertiesTest, MergeWithWillOverwriteProperties) {
  properties const input =
      _obj({{"data", _obj({{"config", _obj({{"append", _v(true)}})}})}});
  properties const output = EXAMPLE_PROPERTIES.mergedWith(input);
  EXPECT_THAT(output, Contains("data"));
  EXPECT_THAT(output["data"], Contains("files"));
  EXPECT_THAT(output["data"]["files"], ArraySizeIs(1));
  EXPECT_THAT(output["data"], Contains("config"));
  EXPECT_THAT(output["data"]["config"], Contains("append"));
  EXPECT_TRUE(output["data"]["config"]["append"]);
}

TEST(PropertiesTest, ArraysWillBeOverwritten) {
  properties const input =
      _obj({{"data", _obj({{"files", _arr({_v("b.txt"), _v("c.txt")})}})}});
  properties const output = EXAMPLE_PROPERTIES.mergedWith(input);
  EXPECT_THAT(output, Contains("data"));
  EXPECT_THAT(output["data"], Contains("files"));
  EXPECT_THAT(output["data"]["files"], ArraySizeIs(2));
  EXPECT_THAT(output["data"]["files"][0ul].str(), "b.txt");
  EXPECT_THAT(output["data"]["files"][1ul].str(), "c.txt");
}