62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
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'use strict';
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const assert = require('assert');
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const ref = require('../');
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let weak; try { weak = require('weak-napi'); } catch (e) {}
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describe('reinterpret()', function() {
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beforeEach(gc);
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it('should return a new Buffer instance at the same address', function() {
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const buf = Buffer.from('hello world');
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const small = buf.slice(0, 0);
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assert.strictEqual(0, small.length);
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assert.strictEqual(buf.address(), small.address());
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const reinterpreted = small.reinterpret(buf.length);
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assert.strictEqual(buf.address(), reinterpreted.address());
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assert.strictEqual(buf.length, reinterpreted.length);
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assert.strictEqual(buf.toString(), reinterpreted.toString());
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})
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it('should return a new Buffer instance starting at the offset address', function() {
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const buf = Buffer.from('hello world');
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const offset = 3;
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const small = buf.slice(offset, buf.length);
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assert.strictEqual(buf.length - offset, small.length);
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assert.strictEqual(buf.address() + offset, small.address());
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const reinterpreted = buf.reinterpret(small.length, offset);
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assert.strictEqual(small.address(), reinterpreted.address());
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assert.strictEqual(small.length, reinterpreted.length);
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assert.strictEqual(small.toString(), reinterpreted.toString());
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})
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it('should retain a reference to the original Buffer when reinterpreted', function() {
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if (weak === undefined)
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return this.skip('weak not avaialbe');
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let origGCd = false;
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let otherGCd = false;
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let buf = Buffer.alloc(1);
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weak(buf, () => { origGCd = true; });
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let other = buf.reinterpret(0);
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weak(other, () => { otherGCd = true; });
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assert(!origGCd, '"buf" has been garbage collected too soon');
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assert(!otherGCd, '"other" has been garbage collected too soon');
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// try to GC `buf`
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buf = null;
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gc();
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assert(!origGCd, '"buf" has been garbage collected too soon');
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assert(!otherGCd, '"other" has been garbage collected too soon');
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// now GC `other`
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other = null;
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gc();
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setImmediate(() => {
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setImmediate(() => {
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assert(otherGCd, '"other" has not been garbage collected');
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assert(origGCd, '"buf" has not been garbage collected');
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});
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});
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});
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});
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