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