15 lines
328 B
JavaScript
15 lines
328 B
JavaScript
const expect = require('expect');
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const isNull = require('./isNull.js');
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test('isNull is a Function', () => {
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expect(isNull).toBeInstanceOf(Function);
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});
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test('passed argument is a null', () => {
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expect(isNull(null)).toBe(true)
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});
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test('passed argument is a null', () => {
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expect(isNull(NaN)).toBe(false)
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});
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