text: /* global test */
  /* eslint-disable no-unused-expressions */
  
  const expect = require('chai').expect;
  const arg = require('.');
  
  test('basic parses arguments from process.argv', () => {
  	const curArgs = process.argv;
  	process.argv = ['node', 'test.js', '--foo', '1337', '-B', 'hello', '--mcgee'];
  	try {
  		const args = arg({
  			'--foo': Number,
  			'--bar': String,
  			'--mcgee': Boolean,
  			'-B': '--bar'
  		});
  
  		expect(args).to.exist;
  		expect(args['--foo']).to.equal(1337);
  		expect(args['--bar']).to.equal('hello');
  		expect(args['--mcgee']).to.equal(true);
  	} finally {
  		process.argv = curArgs;
  	}
  });
  
  test('arg with no arguments', () => {
  	expect(arg()).to.deep.equal({_: []});
  });
  
  test('basic extra arguments parsing', () => {
  	const argv = ['hi', 'hello', 'there', '-'];
  	expect(arg(argv, {})).to.deep.equal({_: argv});
  });
  
  test('basic string parsing', () => {
  	const argv = ['hey', '--foo', 'hi', 'hello'];
  	expect(arg(argv, {'--foo': String})).to.deep.equal({_: ['hey', 'hello'], '--foo': 'hi'});
  });
  
  test('basic string parsing (equals long-arg)', () => {
  	const argv = ['hey', '--foo=hi', 'hello'];
  	expect(arg(argv, {'--foo': String})).to.deep.equal({_: ['hey', 'hello'], '--foo': 'hi'});
  });
  
  test('basic number parsing', () => {
  	const argv = ['hey', '--foo', '1234', 'hello'];
  	expect(arg(argv, {'--foo': Number})).to.deep.equal({_: ['hey', 'hello'], '--foo': 1234});
  });
  
  test('basic boolean parsing', () => {
  	const argv = ['hey', '--foo', '1234', 'hello'];
  	expect(arg(argv, {'--foo': Boolean})).to.deep.equal({_: ['hey', '1234', 'hello'], '--foo': true});
  });
  
  test('basic custom type parsing', () => {
  	const argv = ['hey', '--foo', '1234', 'hello'];
  	const customType = (val, name) => `:${name}:${val}:`;
  	expect(arg(argv, {'--foo': customType})).to.deep.equal({_: ['hey', 'hello'], '--foo': ':--foo:1234:'});
  });
  
  test('basic string parsing (array)', () => {
  	const argv = ['hey', '--foo', 'hi', 'hello', '--foo', 'hey'];
  	expect(arg(argv, {'--foo': [String]})).to.deep.equal({_: ['hey', 'hello'], '--foo': ['hi', 'hey']});
  });
  
  test('basic number parsing (array)', () => {
  	const argv = ['hey', '--foo', '1234', 'hello', '--foo', '5432'];
  	expect(arg(argv, {'--foo': [Number]})).to.deep.equal({_: ['hey', 'hello'], '--foo': [1234, 5432]});
  });
  
  test('basic boolean parsing (array)', () => {
  	const argv = ['hey', '--foo', '1234', 'hello', '--foo', 'hallo'];
  	expect(arg(argv, {'--foo': [Boolean]})).to.deep.equal({_: ['hey', '1234', 'hello', 'hallo'], '--foo': [true, true]});
  });
  
  test('basic custom type parsing (array)', () => {
  	const argv = ['hey', '--foo', '1234', 'hello', '--foo', '8911hi'];
  	const customType = (val, name) => `:${name}:${val}:`;
  	expect(arg(argv, {'--foo': [customType]})).to.deep.equal({_: ['hey', 'hello'], '--foo': [':--foo:1234:', ':--foo:8911hi:']});
  });
  
  test('basic alias parsing', () => {
  	const argv = ['--foo', '1234', '-B', '-', 'hello', '--not-foo-or-bar', 'ohai'];
  
  	const opts = {
  		'--foo': Number,
  		'--bar': String,
  		'--another-arg': Boolean,
  		'-a': '--another-arg',
  		'--not-foo-or-bar': '--another-arg',
  		'-B': '--bar'
  	};
  
  	expect(arg(argv, opts)).to.deep.equal({
  		_: ['hello', 'ohai'],
  		'--foo': 1234,
  		'--bar': '-',
  		'--another-arg': true
  	});
  });
  
  test('double-dash parsing', () => {
  	const argv = ['--foo', '1234', 'hi', '--foo', '5678', 'there', '--', '--foo', '2468'];
  	expect(arg(argv, {'--foo': Number})).to.deep.equal({_: ['hi', 'there', '--foo', '2468'], '--foo': 5678});
  });
  
  test('error: invalid option', () => {
  	const argv = ['--foo', '1234', '--bar', '8765'];
  	expect(() => arg(argv, {'--foo': Number})).to.throw('Unknown or unexpected option: --bar');
  });
  
  test('error: expected argument', () => {
  	const argv = ['--foo', '--bar', '1234'];
  	expect(() => arg(argv, {'--foo': String, '--bar': Number})).to.throw('Option requires argument: --foo');
  });
  
  test('error: expected argument (end flag)', () => {
  	const argv = ['--foo', '--bar'];
  	expect(() => arg(argv, {'--foo': Boolean, '--bar': Number})).to.throw('Option requires argument: --bar');
  });
  
  test('error: expected argument (alias)', () => {
  	const argv = ['--foo', '--bar', '1234'];
  	expect(() => arg(argv, {'--realfoo': String, '--foo': '--realfoo', '--bar': Number})).to.throw('Option requires argument: --foo (alias for --realfoo)');
  });
  
  test('error: expected argument (end flag) (alias)', () => {
  	const argv = ['--foo', '--bar'];
  	expect(() => arg(argv, {'--foo': Boolean, '--realbar': Number, '--bar': '--realbar'})).to.throw('Option requires argument: --bar (alias for --realbar)');
  });
  
  test('error: non-function type', () => {
  	expect(() => arg([], {'--foo': 10})).to.throw('Type missing or not a function or valid array type: --foo');
  	expect(() => arg([], {'--foo': null})).to.throw('Type missing or not a function or valid array type: --foo');
  	expect(() => arg([], {'--foo': undefined})).to.throw('Type missing or not a function or valid array type: --foo');
  });
  