25 lines
923 B
JavaScript
25 lines
923 B
JavaScript
const expect = require('expect');
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const head = require('./head.js');
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test('head is a Function', () => {
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expect(head).toBeInstanceOf(Function);
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});
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test('head({ a: 1234}) returns undefined', () => {
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expect(head({ a: 1234}) === undefined).toBeTruthy();
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});
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t.equal(head([1, 2, 3]), 1, "head([1, 2, 3]) returns 1");
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t.equal(head({ 0: false}), false, 'head({ 0: false}) returns false');
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t.equal(head('String'), 'S', 'head(String) returns S');
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t.throws(() => head(null), 'head(null) throws an Error');
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t.throws(() => head(undefined), 'head(undefined) throws an Error');
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t.throws(() => head(), 'head() throws an Error');
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let start = new Date().getTime();
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head([1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 1122, 32124, 23232]);
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let end = new Date().getTime();
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test('head([1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 1122, 32124, 23232]) takes less than 2s to run', () => {
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expect((end - start) < 2000).toBeTruthy();
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});
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