13 lines
322 B
JavaScript
13 lines
322 B
JavaScript
const expect = require('expect');
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const {isNull} = require('./_30s.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)).toBeTruthy();
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});
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test('passed argument is a null', () => {
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expect(isNull(NaN)).toBeFalsy();
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});
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