67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
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import {
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MemoryHelper
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} from "../src/memoryhelper.js";
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describe(`MemoryHelper.writeSingleBit`, () => {
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test('turn on with offset 0', () => {
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let bytes = new ArrayBuffer(3);
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MemoryHelper.writeSingleBit(bytes, 0, false);
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// check 00 00 00
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const view = new Uint8Array(bytes);
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expect(view[0]).toBe(0);
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expect(view[1]).toBe(0);
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expect(view[2]).toBe(0);
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});
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test('turn off with offset 0', () => {
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let bytes = new ArrayBuffer(3);
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MemoryHelper.writeSingleBit(bytes, 0, true);
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// check 00 00 01
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const view = new Uint8Array(bytes);
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expect(view[0]).toBe(1);
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expect(view[1]).toBe(0);
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expect(view[2]).toBe(0);
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MemoryHelper.writeSingleBit(bytes, 0, false);
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// check 00 00 00
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expect(view[0]).toBe(0);
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expect(view[1]).toBe(0);
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expect(view[2]).toBe(0);
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});
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test('turn on with offset 32', () => {
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let bytes = new ArrayBuffer(3);
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MemoryHelper.writeSingleBit(bytes, 8, true);
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// check 00 01 00
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const view = new Uint8Array(bytes);
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expect(view[0]).toBe(0);
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expect(view[1]).toBe(1);
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expect(view[2]).toBe(0);
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MemoryHelper.writeSingleBit(bytes, 0, true);
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// check 00 01 01
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expect(view[0]).toBe(1);
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expect(view[1]).toBe(1);
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expect(view[2]).toBe(0);
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});
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test('turn on with offset 15', () => {
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let bytes = new ArrayBuffer(3);
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MemoryHelper.writeSingleBit(bytes, 15, true);
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// check 00 80 00
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const view = new Uint8Array(bytes);
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expect(view[0]).toBe(0);
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expect(view[1]).toBe(128);
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expect(view[2]).toBe(0);
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MemoryHelper.writeSingleBit(bytes, 15, false);
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// check 00 00 00
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expect(view[0]).toBe(0);
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expect(view[1]).toBe(0);
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expect(view[2]).toBe(0);
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});
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});
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