36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
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import { expect } from 'chai';
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import { match, stub } from 'sinon';
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import { filterMany } from '../../src/List';
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describe('list utils', async () => {
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describe('filter many helper', async () => {
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it('should call the predicate with an item from each list', async () => {
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const cb = stub().returns(true);
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const results = filterMany(cb, [1], ['a']);
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expect(results.length).to.equal(1);
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expect(cb).to.have.callCount(1);
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expect(cb).to.have.been.calledWithMatch(match.number, match.string);
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});
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it('should call the predicate for each slice', async () => {
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const data = [1, 2, 3, 4, 5];
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const cb = stub().returns(true);
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const results = filterMany(cb, data);
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expect(results.length).to.equal(data.length);
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expect(cb).to.have.callCount(data.length);
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});
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it('should keep slices that passed the predicate', async () => {
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const data = [1, 2, 3, 4, 5];
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const cb = stub().returns(false);
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const results = filterMany(cb, data);
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expect(results.length).to.equal(0);
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expect(cb).to.have.callCount(data.length);
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});
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});
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});
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