22 lines
550 B
JavaScript
22 lines
550 B
JavaScript
const expect = require('expect');
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const {isString} = require('./_30s.js');
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test('isString is a Function', () => {
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expect(isString).toBeInstanceOf(Function);
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});
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test('foo is a string', () => {
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expect(isString('foo')).toBeTruthy();
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});
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test('"10" is a string', () => {
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expect(isString('10')).toBeTruthy();
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});
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test('Empty string is a string', () => {
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expect(isString('')).toBeTruthy();
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});
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test('10 is not a string', () => {
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expect(isString(10)).toBeFalsy();
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});
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test('true is not string', () => {
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expect(isString(true)).toBeFalsy();
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});
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