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GeezerVison is showing github.com — test: add test for fs.read when offset key is null · nodejs/node@b6aa42c

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- test-fs-read-offset-null.js

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`‎test/parallel/test-fs-read-offset-null.js‎`

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+43Lines changed: 43 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,43 @@`
	`1`	`+'use strict';`
	`2`	`+`
	`3`	`+`
	`4`	`+// Test to assert the desired functioning of fs.read`
	`5`	`+// when {offset:null} is passed as options parameter`
	`6`	`+`
	`7`	`+const common = require('../common');`
	`8`	`+const assert = require('assert');`
	`9`	`+const fs = require('fs');`
	`10`	`+const fsPromises = fs.promises;`
	`11`	`+const fixtures = require('../common/fixtures');`
	`12`	`+const filepath = fixtures.path('x.txt');`
	`13`	`+`
	`14`	`+const buf = Buffer.alloc(1);`
	`15`	`+// Reading only one character, hence buffer of one byte is enough`
	`16`	`+`
	`17`	`+// Test for callback api`
	`18`	`+fs.open(filepath, 'r', common.mustSucceed((fd) => {`
	`19`	`+ fs.read(fd, { offset: null, buffer: buf },`
	`20`	`+ common.mustSucceed((bytesRead, buffer) => {`
	`21`	`+ assert.strictEqual(buffer[0], 120);`
	`22`	`+ // Test is done by making sure the first letter in buffer is`
	`23`	`+ // same as first letter in file.`
	`24`	`+ // 66 is the hex for ascii code of letter B`
	`25`	`+`
	`26`	`+ fs.close(fd, common.mustSucceed(() => {}));`
	`27`	`+ }));`
	`28`	`+}));`
	`29`	`+`
	`30`	`+let filehandle = null;`
	`31`	`+`
	`32`	`+// Test for promise api`
	`33`	`+(async () => {`
	`34`	`+ filehandle = await fsPromises.open(filepath, 'r');`
	`35`	`+ const readObject = await filehandle.read(buf, null, buf.length);`
	`36`	`+ assert.strictEqual(readObject.buffer[0], 120);`
	`37`	`+})()`
	`38`	`+.then(common.mustCall())`
	`39`	`+.finally(async () => {`
	`40`	`+// Close the file handle if it is opened`
	`41`	`+ if (filehandle)`
	`42`	`+ await filehandle.close();`
	`43`	`+});`

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