sdk/pkg/args/test/args_test.dart

// Copyright (c) 2012, 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.

library args_test;

import 'package:unittest/unittest.dart';
import 'package:args/args.dart';
import 'utils.dart';

void main() {
  group('ArgParser.addFlag()', () {
    test('throws ArgumentError if the flag already exists', () {
      var parser = new ArgParser();
      parser.addFlag('foo');
      throwsIllegalArg(() => parser.addFlag('foo'));
    });

    test('throws ArgumentError if the option already exists', () {
      var parser = new ArgParser();
      parser.addOption('foo');
      throwsIllegalArg(() => parser.addFlag('foo'));
    });

    test('throws ArgumentError if the abbreviation exists', () {
      var parser = new ArgParser();
      parser.addFlag('foo', abbr: 'f');
      throwsIllegalArg(() => parser.addFlag('flummox', abbr: 'f'));
    });

    test('throws ArgumentError if the abbreviation is longer '
         'than one character', () {
      var parser = new ArgParser();
      throwsIllegalArg(() => parser.addFlag('flummox', abbr: 'flu'));
    });

    test('throws ArgumentError if a flag name is invalid', () {
      var parser = new ArgParser();

      for(var name in _INVALID_OPTIONS) {
        var reason = '${Error.safeToString(name)} is not valid';
        throwsIllegalArg(() => parser.addFlag(name), reason: reason);
      }
    });

    test('accepts valid flag names', () {
      var parser = new ArgParser();

      for(var name in _VALID_OPTIONS) {
        var reason = '${Error.safeToString(name)} is valid';
        expect(() => parser.addFlag(name), returnsNormally, reason: reason);
      }
    });
  });

  group('ArgParser.addOption()', () {
    test('throws ArgumentError if the flag already exists', () {
      var parser = new ArgParser();
      parser.addFlag('foo');
      throwsIllegalArg(() => parser.addOption('foo'));
    });

    test('throws ArgumentError if the option already exists', () {
      var parser = new ArgParser();
      parser.addOption('foo');
      throwsIllegalArg(() => parser.addOption('foo'));
    });

    test('throws ArgumentError if the abbreviation exists', () {
      var parser = new ArgParser();
      parser.addFlag('foo', abbr: 'f');
      throwsIllegalArg(() => parser.addOption('flummox', abbr: 'f'));
    });

    test('throws ArgumentError if the abbreviation is longer '
         'than one character', () {
      var parser = new ArgParser();
      throwsIllegalArg(() => parser.addOption('flummox', abbr: 'flu'));
    });

    test('throws ArgumentError if the abbreviation is empty', () {
      var parser = new ArgParser();
      throwsIllegalArg(() => parser.addOption('flummox', abbr: ''));
    });

    test('throws ArgumentError if the abbreviation is an invalid value', () {
      var parser = new ArgParser();
      for(var name in _INVALID_OPTIONS.where((v) => v != null)) {
        throwsIllegalArg(() => parser.addOption('flummox', abbr: name));
      }
    });

    test('throws ArgumentError if the abbreviation is a dash', () {
      var parser = new ArgParser();
      throwsIllegalArg(() => parser.addOption('flummox', abbr: '-'));
    });

    test('allows explict null value for "abbr"', () {
      var parser = new ArgParser();
      expect(() => parser.addOption('flummox', abbr: null), returnsNormally);
    });

    test('throws ArgumentError if an option name is invalid', () {
      var parser = new ArgParser();

      for(var name in _INVALID_OPTIONS) {
        var reason = '${Error.safeToString(name)} is not valid';
        throwsIllegalArg(() => parser.addOption(name), reason: reason);
      }
    });

    test('accepts valid option names', () {
      var parser = new ArgParser();

      for(var name in _VALID_OPTIONS) {
        var reason = '${Error.safeToString(name)} is valid';
        expect(() => parser.addOption(name), returnsNormally, reason: reason);
      }
    });
  });

  group('ArgParser.getDefault()', () {
    test('returns the default value for an option', () {
      var parser = new ArgParser();
      parser.addOption('mode', defaultsTo: 'debug');
      expect(parser.getDefault('mode'), 'debug');
    });

    test('throws if the option is unknown', () {
      var parser = new ArgParser();
      parser.addOption('mode', defaultsTo: 'debug');
      throwsIllegalArg(() => parser.getDefault('undefined'));
    });
  });

  group('ArgParser.commands', () {
    test('returns an empty map if there are no commands', () {
      var parser = new ArgParser();
      expect(parser.commands, isEmpty);
    });

    test('returns the commands that were added', () {
      var parser = new ArgParser();
      parser.addCommand('hide');
      parser.addCommand('seek');
      expect(parser.commands, hasLength(2));
      expect(parser.commands['hide'], isNotNull);
      expect(parser.commands['seek'], isNotNull);
    });

    test('iterates over the commands in the order they were added', () {
      var parser = new ArgParser();
      parser.addCommand('a');
      parser.addCommand('d');
      parser.addCommand('b');
      parser.addCommand('c');
      expect(parser.commands.keys, equals(['a', 'd', 'b', 'c']));
    });
  });

  group('ArgParser.options', () {
    test('returns an empty map if there are no options', () {
      var parser = new ArgParser();
      expect(parser.options, isEmpty);
    });

    test('returns the options that were added', () {
      var parser = new ArgParser();
      parser.addFlag('hide');
      parser.addOption('seek');
      expect(parser.options, hasLength(2));
      expect(parser.options['hide'], isNotNull);
      expect(parser.options['seek'], isNotNull);
    });

    test('iterates over the options in the order they were added', () {
      var parser = new ArgParser();
      parser.addFlag('a');
      parser.addOption('d');
      parser.addFlag('b');
      parser.addOption('c');
      expect(parser.options.keys, equals(['a', 'd', 'b', 'c']));
    });
  });

  group('ArgResults', () {
    group('options', () {
      test('returns the provided options', () {
        var parser = new ArgParser();
        parser.addFlag('woof');
        parser.addOption('meow');

        parser.addOption('missing-option');
        parser.addFlag('missing-flag', defaultsTo: null);

        var args = parser.parse(['--woof', '--meow', 'kitty']);
        expect(args.options, hasLength(2));
        expect(args.options, contains('woof'));
        expect(args.options, contains('meow'));
      });

      test('includes defaulted options', () {
        var parser = new ArgParser();
        parser.addFlag('woof', defaultsTo: false);
        parser.addOption('meow', defaultsTo: 'kitty');

        // Flags normally have a default value.
        parser.addFlag('moo');

        parser.addOption('missing-option');
        parser.addFlag('missing-flag', defaultsTo: null);

        var args = parser.parse([]);
        expect(args.options, hasLength(3));
        expect(args.options, contains('woof'));
        expect(args.options, contains('meow'));
        expect(args.options, contains('moo'));
      });
    });

    test('[] throws if the name is not an option', () {
      var results = new ArgParser().parse([]);
      throwsIllegalArg(() => results['unknown']);
    });

    test('rest cannot be modified', () {
      var results = new ArgParser().parse([]);
      expect(() => results.rest.add('oops'), throwsUnsupportedError);
    });

    group('.wasParsed()', () {
      test('throws if the name is not an option', () {
        var results = new ArgParser().parse([]);
        throwsIllegalArg(() => results.wasParsed('unknown'));
      });

      test('returns true for parsed options', () {
        var parser = new ArgParser();
        parser.addFlag('fast');
        parser.addFlag('verbose');
        parser.addOption('mode');
        parser.addOption('output');

        var results = parser.parse(['--fast', '--mode=debug']);

        expect(results.wasParsed('fast'), isTrue);
        expect(results.wasParsed('verbose'), isFalse);
        expect(results.wasParsed('mode'), isTrue);
        expect(results.wasParsed('output'), isFalse);
      });
    });
  });

  group('Option', () {
    test('.getOrDefault() returns a type-specific default value', () {
      var parser = new ArgParser();
      parser.addFlag('flag-no', defaultsTo: null);
      parser.addFlag('flag-def', defaultsTo: true);
      parser.addOption('single-no');
      parser.addOption('single-def', defaultsTo: 'def');
      parser.addOption('multi-no', allowMultiple: true);
      parser.addOption('multi-def', allowMultiple: true, defaultsTo: 'def');

      expect(parser.options['flag-no'].getOrDefault(null), equals(null));
      expect(parser.options['flag-no'].getOrDefault(false), equals(false));
      expect(parser.options['flag-def'].getOrDefault(null), equals(true));
      expect(parser.options['flag-def'].getOrDefault(false), equals(false));
      expect(parser.options['single-no'].getOrDefault(null), equals(null));
      expect(parser.options['single-no'].getOrDefault('v'), equals('v'));
      expect(parser.options['single-def'].getOrDefault(null), equals('def'));
      expect(parser.options['single-def'].getOrDefault('v'), equals('v'));
      expect(parser.options['multi-no'].getOrDefault(null), equals([]));
      expect(parser.options['multi-no'].getOrDefault(['v']), equals(['v']));
      expect(parser.options['multi-def'].getOrDefault(null), equals(['def']));
      expect(parser.options['multi-def'].getOrDefault(['v']), equals(['v']));
    });
  });
}

const _INVALID_OPTIONS = const [
 ' ', '', '-', '--', '--foo',
 ' with space',
 'with\ttab',
 'with\rcarriage\rreturn',
 'with\nline\nfeed',
 "'singlequotes'",
 '"doublequotes"',
 'back\\slash',
 'forward/slash'
];

const _VALID_OPTIONS = const [
 'a' // One character.
 'contains-dash',
 'contains_underscore',
 'ends-with-dash-',
 'contains--doubledash--',
 '1starts-with-number',
 'contains-a-1number',
 'ends-with-a-number8'
];