Commander test

const sinon = require('sinon');
const _ = require('lodash');


describe.only('CLI', function() {
    beforeEach(function() {
        this.originalArgv = _.cloneDeep(process.argv);
        this.exitStub = sinon.stub(process, 'exit');
    });

    afterEach(function() {
        process.argv = this.originalArgv;
        process.exit.restore();
        sinon.restore();
    });

    it('exits with 1 when no command is provided', async function() {
        await cli([]);

        // Help is output twice
        // Process.exit(1) is called twice

        expect(process.exit).to.have.been.calledOnce; // expected exit to have been called exactly once, but it was called twice
        expect(process.exit).to.have.been.calledWithExactly(1);
    });

    it('exits with 1 when an invalid command is provided', async function() {
        await cli(['iAmVeryInvalid']);

        // Help is output once
        // Process.exit(1) is called once

        expect(process.exit).to.have.been.calledOnce;
        expect(process.exit).to.have.been.calledWithExactly(1);
    });
});


/**
 * @param {string[]} cliArguments
 */
async function cli(cliArguments) {
    process.argv = [...process.argv.slice(0, 2), ...cliArguments];

    const module = '../../bin/cli';
    delete require.cache[require.resolve(module)];
    return await require(module);
}