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Code Issues Releases Wiki Activity

Beef up unit test coverage in io package.

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This commit is contained in:
Jeff Schiller 2023-11-20 22:44:41 -08:00
parent 5c4a085292
commit 2ed482879f
8 changed files with 164 additions and 25 deletions
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60
tests/io-bitbuffer.spec.js
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@ -11,18 +11,35 @@ import 'mocha';
import { expect } from 'chai';
describe('bitjs.io.BitBuffer', () => {
/** @type {BitBuffer} */
let buffer;
it('throws when invalid numBytes', () => {
expect(() => new BitBuffer()).throws();
});
describe('least-to-most-significant bit-packing', () => {
beforeEach(() => {
buffer = new BitBuffer(4);
});
it('bit/byte pointers initialized properly', () => {
expect(buffer.getPackingDirection()).equals(false);
expect(buffer.bytePtr).equals(0);
expect(buffer.bitPtr).equals(0);
})
});
it('throws when writing invalid values', () => {
expect(() => buffer.writeBits(-3, 2)).throws();
expect(() => buffer.writeBits(3, -2)).throws();
expect(() => buffer.writeBits(0, 54)).throws();
});
it('throws when writing too many bits into the buffer', () => {
buffer.writeBits(0, 31); // thirty-one zeroes.
expect(() => buffer.writeBits(1, 2)).throws();
});
it('write multiple bits', () => {
buffer.writeBits(0b01011, 5); // Should result in: 0b00001011.
expect(buffer.bytePtr).equals(0);
@ -47,6 +64,26 @@ describe('bitjs.io.BitBuffer', () => {
expect(Array.from(buffer.data)).to.have.ordered.members(
[0xfe, 0xff, 0x03, 0x00]);
});
it('properly changes bit-packing direction', () => {
buffer.writeBits(3, 2);
expect(buffer.data[0]).equals(3);
expect(buffer.bytePtr).equals(0);
expect(buffer.bitPtr).equals(2);
buffer.setPackingDirection(true /** most to least significant */);
expect(buffer.bytePtr).equals(1);
expect(buffer.bitPtr).equals(7);
buffer.writeBits(7, 3);
expect(buffer.data[0]).equals(3);
expect(buffer.data[1]).equals(224);
});
it('throws when switching packing direction and no more bytes left', () => {
buffer.writeBits(0, 25);
expect(() => buffer.setPackingDirection(true)).throws();
});
});
describe('most-to-least-significant bit-packing', () => {
@ -55,6 +92,7 @@ describe('bitjs.io.BitBuffer', () => {
});
it('bit/byte pointers initialized properly', () => {
expect(buffer.getPackingDirection()).equals(true);
expect(buffer.bytePtr).equals(0);
expect(buffer.bitPtr).equals(7);
})
@ -84,5 +122,25 @@ describe('bitjs.io.BitBuffer', () => {
expect(Array.from(buffer.data)).to.have.ordered.members(
[0x7f, 0xff, 0xc0, 0x00]);
});
it('properly changes bit-packing direction', () => {
buffer.writeBits(3, 2);
expect(buffer.bytePtr).equals(0);
expect(buffer.bitPtr).equals(5);
expect(buffer.data[0]).equals(192);
buffer.setPackingDirection(false /** least to most significant */);
expect(buffer.bytePtr).equals(1);
expect(buffer.bitPtr).equals(0);
buffer.writeBits(7, 3);
expect(buffer.data[0]).equals(192);
expect(buffer.data[1]).equals(7);
});
it('throws when switching packing direction and no more bytes left', () => {
buffer.writeBits(0, 25);
expect(() => buffer.setPackingDirection(false)).throws();
});
});
});