cpp-argument-parser/test/usage_test.cpp

//
//  logging_test.cpp
//  program_args-test
//
//  Created by Sam Jaffe on 2/16/21.
//

#define PROGRAM_ARGS_NOEXIT_ON_HELP

#include "program_args/arguments.h"
#include "scoped_buffer_capture.h"
#include "xcode_gtest_helper.h"

using testing::HasSubstr;
using testing::Not;

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

template <typename T> auto usage() {
  scoped_buffer_capture_t cap_cout(std::cout);
  parse<T>({"", "--help"});
  return cap_cout.str();
}

struct ArgNamesTest : program::Arguments<ArgNamesTest> {
  using Arguments::Arguments;
  bool dry_run = flag("dry-run");
  int level = option("level");
  int port = option("port", 'p');
};

TEST(ArgNamesTest, PrintsOutBothArgsWhenRelevant) {
  auto result = usage<ArgNamesTest>();
  EXPECT_THAT(result, HasSubstr(" --port,-p:"));
}

TEST(ArgNamesTest, PrintsOutInversionFlag) {
  auto result = usage<ArgNamesTest>();
  EXPECT_THAT(result, HasSubstr(" --no-dry-run,--dry-run:"));
}

TEST(ArgNamesTest, PrintsOutBothSingleNameWithoutAbbrev) {
  auto result = usage<ArgNamesTest>();
  EXPECT_THAT(result, HasSubstr(" --level:"));
}

struct ArgDescTest : program::Arguments<ArgDescTest> {
  using Arguments::Arguments;
  int port = option("port", "The host port to listen on for web traffic");
};

TEST(ArgDescTest, PrintsOutBothArgsWhenRelevant) {
  auto result = usage<ArgDescTest>();
  EXPECT_THAT(result, HasSubstr(" --port: The host port"));
}

struct ArgDefValTest : program::Arguments<ArgDefValTest> {
  using Arguments::Arguments;
  int level = option("level") = 5;
  int port = option("port", "The host port to listen on for web traffic") =
      8080;
};

TEST(ArgDefValTest, PrintsOutDefaultValueWithDescription) {
  auto result = usage<ArgDefValTest>();
  EXPECT_THAT(result, HasSubstr("Default Value: 8080"));
}

TEST(ArgDefValTest, DoesntAddDefValWithoutDescription) {
  auto result = usage<ArgDefValTest>();
  EXPECT_THAT(result, Not(HasSubstr("5")));
}