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test: add Buffer slice UTF-8 test #1989

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test: add Buffer slice UTF-8 test #1989

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21 changes: 20 additions & 1 deletion test/parallel/test-buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -269,6 +269,8 @@ writeTest.write('e', 3, 'ascii');
writeTest.write('j', 'ascii', 4);
assert.equal(writeTest.toString(), 'nodejs');

// ASCII slice test

var asciiString = 'hello world';
var offset = 100;

Expand All @@ -289,8 +291,25 @@ for (var i = 0; i < asciiString.length; i++) {
assert.equal(sliceA[i], sliceB[i]);
}

// TODO utf8 slice tests
// UTF-8 slice test

var utf8String = '¡hέlló wôrld!';
var offset = 100;

b.write(utf8String, 0, Buffer.byteLength(utf8String), 'utf8');
var utf8Slice = b.toString('utf8', 0, Buffer.byteLength(utf8String));
assert.equal(utf8String, utf8Slice);

var written = b.write(utf8String, offset, 'utf8');
assert.equal(Buffer.byteLength(utf8String), written);
utf8Slice = b.toString('utf8', offset, offset + Buffer.byteLength(utf8String));
assert.equal(utf8String, utf8Slice);

var sliceA = b.slice(offset, offset + Buffer.byteLength(utf8String));
var sliceB = b.slice(offset, offset + Buffer.byteLength(utf8String));
for (var i = 0; i < Buffer.byteLength(utf8String); i++) {
assert.equal(sliceA[i], sliceB[i]);
}

var slice = b.slice(100, 150);
assert.equal(50, slice.length);
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