cpp-argument-parser/test/flag_test.cpp

//
//  flag_test.cpp
//  program_args-test
//
//  Created by Sam Jaffe on 2/7/21.
//

#include "program_args/arguments.h"

#include "xcode_gtest_helper.h"

using testing::Eq;

template <typename T, size_t N> static T parse(char const * const (&argv)[N]) {
  return T(N, argv);
}

struct FlagTest : program::Arguments<FlagTest> {
  using program::Arguments<FlagTest>::Arguments;

  bool dry_run = flag("dry-run");
  int verbosity = flag("verbose");
};

TEST(FlagTest, ArgumentsAreDefaultedNaturally) {
  auto const options = parse<FlagTest>({""});
  EXPECT_THAT(options.dry_run, Eq(false));
  EXPECT_THAT(options.verbosity, Eq(0));
}

TEST(FlagTest, FlagsDoNotRequireAdditionalArguments) {
  EXPECT_NO_THROW(parse<FlagTest>({"", "--dry-run"}));
}

TEST(FlagTest, BooleanFlagSetsState) {
  auto const options = parse<FlagTest>({"", "--dry-run"});
  EXPECT_THAT(options.dry_run, Eq(true));
}

TEST(FlagTest, BooleanFlagIsIdempotent) {
  EXPECT_NO_THROW(parse<FlagTest>({"", "--dry-run", "--dry-run"}));
}

TEST(FlagTest, BooleanFlagCanBeInverted) {
  auto const options = parse<FlagTest>({"", "--dry-run", "--no-dry-run"});
  EXPECT_THAT(options.dry_run, Eq(false));
}

TEST(FlagTest, IntegerFlagIncrementsState) {
  auto const options = parse<FlagTest>({"", "--verbose"});
  EXPECT_THAT(options.verbosity, Eq(1));
}

TEST(FlagTest, IntegerFlagCanBeRepeated) {
  auto const options = parse<FlagTest>({"", "--verbose", "--verbose"});
  EXPECT_THAT(options.verbosity, Eq(2));
}