generator-fast-forward
v1.0.1
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A small program to short-circuit ES6 generator steps; especially useful in testing ES6 generator output.
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generator-fast-forward
A small utility to ease the stepping-through of ES6 generator code. I use it primarily for testing ES6 generators. Very simple to use, no external dependencies. Here is the test file:
function* generator() {
try {
yield 1;
const john = yield "john";
yield 2;
yield `${john}ny`;
const su = yield "su";
yield 3;
yield `${su}san and ${john}ny`;
} catch (error) {
console.log(error);
}
}
describe('generatorFF', () => {
test('it works 1', () => {
const gen = generator();
generatorFF(0)(gen);
expect(gen.next().value).toEqual(1);
});
test('it works 2', () => {
const gen = generator();
generatorFF(1)(gen);
expect(gen.next().value).toEqual('john');
});
test('it works 3', () => {
const gen = generator();
generatorFF(2)(gen);
expect(gen.next('john').value).toEqual(2);
});
test('it works 4', () => {
const gen = generator();
generatorFF(3)(gen, [{index: 2, value: 'john'}]);
expect(gen.next().value).toEqual('johnny');
});
test('it works 5', () => {
const gen = generator();
generatorFF(4)(gen);
expect(gen.next().value).toEqual('su');
});
test('it works 6', () => {
const gen = generator();
generatorFF(5)(gen);
expect(gen.next('su').value).toEqual(3);
});
test('it works 7', () => {
const gen = generator();
generatorFF(6)(gen, [{index: 2, value: 'john'}, {index: 5, value: 'su'}]);
expect(gen.next().value).toEqual('susan and johnny');
});
test('it works throws', () => {
const gen = generator();
sinon.spy(console, 'log');
generatorFF(4)(gen, [], [{index: 3, value: new Error('error')}]);
expect(console.log.calledOnce).toBe(true);
console.log.restore();
});
});