21 lines
806 B
JavaScript
21 lines
806 B
JavaScript
const expect = require('expect');
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const isWritableStream = require('./isWritableStream.js');
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const fs = require('fs');
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const Stream = require('stream');
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test('isWritableStream is a Function', () => {
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expect(isWritableStream).toBeInstanceOf(Function);
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});
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test('isWritableStream returns false for read streams', () => {
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expect(isWritableStream(fs.createReadStream('isWritableStream.js'))).toBeFalsy();
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});
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test('isWritableStream returns true for write streams', () => {
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expect(isWritableStream(fs.createWriteStream('isWritableStream.js'))).toBeTruthy();
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});
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test('isWritableStream returns true for duplex streams', () => {
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expect(isWritableStream(new Stream.Duplex())).toBeTruthy();
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});
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test('isWritableStream returns false for non-streams', () => {
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expect(isWritableStream({})).toBeFalsy();
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});
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