test/command_runner_test.dart

// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:args/command_runner.dart';
import 'package:test/test.dart';

import 'test_utils.dart';

const _defaultUsage = '''
Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage information.

Available commands:
  help   Display help information for test.

Run "test help <command>" for more information about a command.''';

void main() {
  late CommandRunner runner;
  setUp(() {
    runner = CommandRunner('test', 'A test command runner.');
  });

  test('.invocation has a sane default', () {
    expect(runner.invocation, equals('test <command> [arguments]'));
  });

  group('.usage', () {
    test('returns the usage string', () {
      expect(runner.usage, equals('''
A test command runner.

$_defaultUsage'''));
    });

    test('contains custom commands', () {
      runner.addCommand(FooCommand());

      expect(runner.usage, equals('''
A test command runner.

Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage information.

Available commands:
  foo   Set a value.

Run "test help <command>" for more information about a command.'''));
    });

    test('truncates newlines in command descriptions by default', () {
      runner.addCommand(MultilineCommand());

      expect(runner.usage, equals('''
A test command runner.

Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage information.

Available commands:
  multiline   Multi

Run "test help <command>" for more information about a command.'''));
    });

    test('supports newlines in command summaries', () {
      runner.addCommand(MultilineSummaryCommand());

      expect(runner.usage, equals('''
A test command runner.

Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage information.

Available commands:
  multiline   Multi
              line.

Run "test help <command>" for more information about a command.'''));
    });

    test('contains custom options', () {
      runner.argParser.addFlag('foo', help: 'Do something.');

      expect(runner.usage, equals('''
A test command runner.

Usage: test <command> [arguments]

Global options:
-h, --help        Print this usage information.
    --[no-]foo    Do something.

Available commands:
  help   Display help information for test.

Run "test help <command>" for more information about a command.'''));
    });

    test("doesn't print hidden commands", () {
      runner
        ..addCommand(HiddenCommand())
        ..addCommand(FooCommand());

      expect(runner.usage, equals('''
A test command runner.

Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage information.

Available commands:
  foo   Set a value.

Run "test help <command>" for more information about a command.'''));
    });

    test("doesn't print aliases", () {
      runner.addCommand(AliasedCommand());

      expect(runner.usage, equals('''
A test command runner.

Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage information.

Available commands:
  aliased   Set a value.

Run "test help <command>" for more information about a command.'''));
    });

    test('respects usageLineLength', () {
      runner = CommandRunner('name', 'desc', usageLineLength: 35);
      expect(runner.usage, equals('''
desc

Usage: name <command> [arguments]

Global options:
-h, --help    Print this usage
              information.

Available commands:
  help   Display help information
         for name.

Run "name help <command>" for more
information about a command.'''));
    });
  });

  test('usageException splits up the message and usage', () {
    expect(() => runner.usageException('message'),
        throwsUsageException('message', _defaultUsage));
  });

  group('run()', () {
    test('runs a command', () {
      var command = FooCommand();
      runner.addCommand(command);

      expect(
          runner.run(['foo']).then((_) {
            expect(command.hasRun, isTrue);
          }),
          completes);
    });

    test('runs an asynchronous command', () {
      var command = AsyncCommand();
      runner.addCommand(command);

      expect(
          runner.run(['async']).then((_) {
            expect(command.hasRun, isTrue);
          }),
          completes);
    });

    test('runs a command with a return value', () {
      var runner = CommandRunner<int>('test', '');
      var command = ValueCommand();
      runner.addCommand(command);

      expect(runner.run(['foo']), completion(equals(12)));
    });

    test('runs a command with an asynchronous return value', () {
      var runner = CommandRunner<String>('test', '');
      var command = AsyncValueCommand();
      runner.addCommand(command);

      expect(runner.run(['foo']), completion(equals('hi')));
    });

    test('runs a hidden comand', () {
      var command = HiddenCommand();
      runner.addCommand(command);

      expect(
          runner.run(['hidden']).then((_) {
            expect(command.hasRun, isTrue);
          }),
          completes);
    });

    test('runs an aliased comand', () {
      var command = AliasedCommand();
      runner.addCommand(command);

      expect(
          runner.run(['als']).then((_) {
            expect(command.hasRun, isTrue);
          }),
          completes);
    });

    test('runs a subcommand', () {
      var command = AsyncCommand();
      runner.addCommand(FooCommand()..addSubcommand(command));

      expect(
          runner.run(['foo', 'async']).then((_) {
            expect(command.hasRun, isTrue);
          }),
          completes);
    });

    group('suggests similar commands', () {
      test('deletions', () {
        var command = FooCommand();
        runner.addCommand(command);

        for (var typo in ['afoo', 'foao', 'fooa']) {
          expect(() => runner.run([typo]), throwsUsageException('''
Could not find a command named "$typo".

Did you mean one of these?
  foo
''', anything));
        }
      });

      test('additions', () {
        var command = LongCommand();
        runner.addCommand(command);

        for (var typo in ['ong', 'lng', 'lon']) {
          expect(() => runner.run([typo]), throwsUsageException('''
Could not find a command named "$typo".

Did you mean one of these?
  long
''', anything));
        }
      });

      test('substitutions', () {
        var command = LongCommand();
        runner.addCommand(command);

        for (var typo in ['aong', 'lang', 'lona']) {
          expect(() => runner.run([typo]), throwsUsageException('''
Could not find a command named "$typo".

Did you mean one of these?
  long
''', anything));
        }
      });

      test('swaps', () {
        var command = LongCommand();
        runner.addCommand(command);

        for (var typo in ['olng', 'lnog', 'logn']) {
          expect(() => runner.run([typo]), throwsUsageException('''
Could not find a command named "$typo".

Did you mean one of these?
  long
''', anything));
        }
      });

      test('combinations', () {
        var command = LongCommand();
        runner.addCommand(command);

        for (var typo in ['oln', 'on', 'lgn', 'alogn']) {
          expect(() => runner.run([typo]), throwsUsageException('''
Could not find a command named "$typo".

Did you mean one of these?
  long
''', anything));
        }
      });

      test('sorts by relevance', () {
        var a = CustomNameCommand('abcd');
        runner.addCommand(a);
        var b = CustomNameCommand('bcd');
        runner.addCommand(b);

        expect(() => runner.run(['abdc']), throwsUsageException('''
Could not find a command named "abdc".

Did you mean one of these?
  abcd
  bcd
''', anything));

        expect(() => runner.run(['bdc']), throwsUsageException('''
Could not find a command named "bdc".

Did you mean one of these?
  bcd
  abcd
''', anything));
      });

      test('omits commands with an edit distance over 2', () {
        var command = LongCommand();
        runner.addCommand(command);

        for (var typo in ['llllong', 'aolgn', 'abcg', 'longggg']) {
          expect(
              () => runner.run([typo]),
              throwsUsageException(
                  'Could not find a command named "$typo".', anything));
        }
      });

      test('max edit distance is configurable', () {
        runner = CommandRunner('test', 'A test command runner.',
            suggestionDistanceLimit: 1)
          ..addCommand(LongCommand());
        expect(
            () => runner.run(['ng']),
            throwsUsageException(
                'Could not find a command named "ng".', anything));

        runner = CommandRunner('test', 'A test command runner.',
            suggestionDistanceLimit: 3)
          ..addCommand(LongCommand());
        expect(() => runner.run(['g']), throwsUsageException('''
Could not find a command named "g".

Did you mean one of these?
  long
''', anything));
      });

      test('supports subcommands', () {
        var command = FooCommand();
        command.addSubcommand(LongCommand());
        runner.addCommand(command);
        expect(() => runner.run(['foo', 'ong']), throwsUsageException('''
Could not find a subcommand named "ong" for "test foo".

Did you mean one of these?
  long
''', anything));
      });

      test('doesn\'t show hidden commands', () {
        var command = HiddenCommand();
        runner.addCommand(command);
        expect(
            () => runner.run(['hidde']),
            throwsUsageException(
                'Could not find a command named "hidde".', anything));
      });
    });

    group('with --help', () {
      test('with no command prints the usage', () {
        expect(() => runner.run(['--help']), prints('''
A test command runner.

$_defaultUsage
'''));
      });

      test('with a preceding command prints the usage for that command', () {
        var command = FooCommand();
        runner.addCommand(command);

        expect(() => runner.run(['foo', '--help']), prints('''
Set a value.

Usage: test foo [arguments]
-h, --help    Print this usage information.

Run "test help" to see global options.
'''));
      });

      test('with a following command prints the usage for that command', () {
        var command = FooCommand();
        runner.addCommand(command);

        expect(() => runner.run(['--help', 'foo']), prints('''
Set a value.

Usage: test foo [arguments]
-h, --help    Print this usage information.

Run "test help" to see global options.
'''));
      });
    });

    group('with help command', () {
      test('with no command prints the usage', () {
        expect(() => runner.run(['help']), prints('''
A test command runner.

$_defaultUsage
'''));
      });

      test('with a command prints the usage for that command', () {
        var command = FooCommand();
        runner.addCommand(command);

        expect(() => runner.run(['help', 'foo']), prints('''
Set a value.

Usage: test foo [arguments]
-h, --help    Print this usage information.

Run "test help" to see global options.
'''));
      });

      test('prints its own usage', () {
        expect(() => runner.run(['help', 'help']), prints('''
Display help information for test.

Usage: test help [command]
-h, --help    Print this usage information.

Run "test help" to see global options.
'''));
      });
    });

    group('with an invalid argument', () {
      test('at the root throws the root usage', () {
        expect(
            runner.run(['--asdf']),
            throwsUsageException(
                'Could not find an option named "asdf".', '$_defaultUsage'));
      });

      test('for a command throws the command usage', () {
        var command = FooCommand();
        runner.addCommand(command);

        expect(runner.run(['foo', '--asdf']),
            throwsUsageException('Could not find an option named "asdf".', '''
Usage: test foo [arguments]
-h, --help    Print this usage information.

Run "test help" to see global options.'''));
      });
    });
  });

  group('with a footer', () {
    setUp(() {
      runner = CommandRunnerWithFooter('test', 'A test command runner.');
    });

    test('includes the footer in the usage string', () {
      expect(runner.usage, equals('''
A test command runner.

$_defaultUsage
Also, footer!'''));
    });

    test('includes the footer in usage errors', () {
      expect(
          runner.run(['--bad']),
          throwsUsageException('Could not find an option named "bad".',
              '$_defaultUsage\nAlso, footer!'));
    });
  });

  group('with a footer and wrapping', () {
    setUp(() {
      runner =
          CommandRunnerWithFooterAndWrapping('test', 'A test command runner.');
    });
    test('includes the footer in the usage string', () {
      expect(runner.usage, equals('''
A test command runner.

Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage
              information.

Available commands:
  help   Display help information for
         test.

Run "test help <command>" for more
information about a command.
LONG footer! This is a long footer, so
we can check wrapping on long footer
messages.

And make sure that they preserve
newlines properly.'''));
    });

    test('includes the footer in usage errors', () {
      expect(runner.run(['--bad']),
          throwsUsageException('Could not find an option named "bad".', '''
Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage
              information.

Available commands:
  help   Display help information for
         test.

Run "test help <command>" for more
information about a command.
LONG footer! This is a long footer, so
we can check wrapping on long footer
messages.

And make sure that they preserve
newlines properly.'''));
    });
  });

  group('throws a useful error when', () {
    test('arg parsing fails', () {
      expect(
          runner.run(['--bad']),
          throwsUsageException(
              'Could not find an option named "bad".', _defaultUsage));
    });

    test("a top-level command doesn't exist", () {
      expect(
          runner.run(['bad']),
          throwsUsageException(
              'Could not find a command named "bad".', _defaultUsage));
    });

    test("a subcommand doesn't exist", () {
      runner.addCommand(FooCommand()..addSubcommand(AsyncCommand()));

      expect(runner.run(['foo bad']),
          throwsUsageException('Could not find a command named "foo bad".', '''
Usage: test <command> [arguments]

Global options:
-h, --help    Print this usage information.

Available commands:
  foo   Set a value.

Run "test help <command>" for more information about a command.'''));
    });

    test("a subcommand wasn't passed", () {
      runner.addCommand(FooCommand()..addSubcommand(AsyncCommand()));

      expect(runner.run(['foo']),
          throwsUsageException('Missing subcommand for "test foo".', '''
Usage: test foo <subcommand> [arguments]
-h, --help    Print this usage information.

Available subcommands:
  async   Set a value asynchronously.

Run "test help" to see global options.'''));
    });

    test("a command that doesn't take arguments was given them", () {
      runner.addCommand(FooCommand());

      expect(runner.run(['foo', 'bar']),
          throwsUsageException('Command "foo" does not take any arguments.', '''
Usage: test foo [arguments]
-h, --help    Print this usage information.

Run "test help" to see global options.'''));
    });
  });

  test('mandatory options in commands', () async {
    var subcommand = _MandatoryOptionCommand();
    runner.addCommand(subcommand);
    expect(
        () => runner.run([subcommand.name]),
        throwsA(isA<UsageException>().having((e) => e.message, 'message',
            contains('Option mandatory-option is mandatory'))));
    expect(await runner.run([subcommand.name, '--mandatory-option', 'foo']),
        'foo');
  });
}

class _MandatoryOptionCommand extends Command {
  _MandatoryOptionCommand() {
    argParser.addOption('mandatory-option', mandatory: true);
  }

  @override
  String get description => 'A command with a mandatory option';

  @override
  String get name => 'mandatory-option-command';

  @override
  String run() => argResults!['mandatory-option'];
}