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command.helpOption.test.js
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command.helpOption.test.js
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const commander = require('../');
describe('helpOption', () => {
let writeSpy;
let consoleErrorSpy;
beforeAll(() => {
// Optional. Suppress expected output to keep test output clean.
writeSpy = jest.spyOn(process.stdout, 'write').mockImplementation(() => { });
consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation(() => { });
});
afterEach(() => {
writeSpy.mockClear();
consoleErrorSpy.mockClear();
});
afterAll(() => {
writeSpy.mockRestore();
consoleErrorSpy.mockRestore();
});
test('when helpOption has custom flags then custom short flag invokes help', () => {
const program = new commander.Command();
program
.exitOverride()
.helpOption('-c,--custom-help', 'custom help output');
expect(() => {
program.parse(['-c'], { from: 'user' });
}).toThrow('(outputHelp)');
});
test('when helpOption has custom flags then custom long flag invokes help', () => {
const program = new commander.Command();
program
.exitOverride()
.helpOption('-c,--custom-help', 'custom help output');
expect(() => {
program.parse(['--custom-help'], { from: 'user' });
}).toThrow('(outputHelp)');
});
test('when helpOption has just custom short flag then custom short flag invokes help', () => {
const program = new commander.Command();
program
.exitOverride()
.helpOption('-c', 'custom help output');
expect(() => {
program.parse(['-c'], { from: 'user' });
}).toThrow('(outputHelp)');
});
test('when helpOption has just custom long flag then custom long flag invokes help', () => {
const program = new commander.Command();
program
.exitOverride()
.helpOption('--custom-help', 'custom help output');
expect(() => {
program.parse(['--custom-help'], { from: 'user' });
}).toThrow('(outputHelp)');
});
test('when helpOption has custom description then helpInformation include custom description', () => {
const program = new commander.Command();
program
.helpOption('-C,--custom-help', 'custom help output');
const helpInformation = program.helpInformation();
expect(helpInformation).toMatch(/-C,--custom-help +custom help output/);
});
test('when helpOption(false) then helpInformation does not include --help', () => {
const program = new commander.Command();
program
.helpOption(false);
const helpInformation = program.helpInformation();
expect(helpInformation).not.toMatch('--help');
});
test('when helpOption(false) then --help is an unknown option', () => {
const program = new commander.Command();
program
.exitOverride()
.helpOption(false);
let caughtErr;
try {
program.parse(['--help'], { from: 'user' });
} catch (err) {
caughtErr = err;
}
expect(caughtErr.code).toBe('commander.unknownOption');
});
test('when helpOption(false) then -h is an unknown option', () => {
const program = new commander.Command();
program
.exitOverride()
.helpOption(false);
let caughtErr;
try {
program.parse(['-h'], { from: 'user' });
} catch (err) {
caughtErr = err;
}
expect(caughtErr.code).toBe('commander.unknownOption');
});
test('when helpOption(false) then unknown command error does not suggest --help', () => {
const program = new commander.Command();
program
.exitOverride()
.helpOption(false)
.command('foo');
expect(() => {
program.parse(['UNKNOWN'], { from: 'user' });
}).toThrow("error: unknown command 'UNKNOWN'.");
});
});