20 lines
641 B
JavaScript
20 lines
641 B
JavaScript
const expect = require('expect');
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const { isStream } = require('./_30s.js');
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const Stream = require('stream');
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test('isStream is a Function', () => {
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expect(isStream).toBeInstanceOf(Function);
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});
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test('isStream returns true for read streams', () => {
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expect(isStream(new Stream.Readable())).toBeTruthy();
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});
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test('isStream returns true for write streams', () => {
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expect(isStream(new Stream.Writable())).toBeTruthy();
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});
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test('isStream returns true for duplex streams', () => {
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expect(isStream(new Stream.Duplex())).toBeTruthy();
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});
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test('isStream returns false for non-streams', () => {
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expect(isStream({})).toBeFalsy();
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});
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