76 lines
1.8 KiB
JavaScript
76 lines
1.8 KiB
JavaScript
defineDescribe('Composition', [
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'./Composition',
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'./ImageRegion',
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], (
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Composition,
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ImageRegion
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) => {
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'use strict';
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let inputA;
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let inputB;
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beforeEach(() => {
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inputA = ImageRegion.fromValues(2, 2, [
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0, 1,
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0, 1,
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]);
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inputB = ImageRegion.fromValues(2, 2, [
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0, 0,
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1, 1,
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]);
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});
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describe('subtract', () => {
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it('returns a new image of the same size', () => {
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const output = Composition.subtract(inputA, inputB);
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expect(output).not.toBe(inputA);
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expect(output).not.toBe(inputB);
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expect(output.width).toEqual(inputA.width);
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expect(output.height).toEqual(inputA.height);
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expect(output.dim).toEqual(inputA.dim);
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expect(output.values).not.toBe(inputA.values);
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expect(output.values).not.toBe(inputB.values);
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});
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it('uses the given target if specified', () => {
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const output = Composition.subtract(
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inputA,
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inputB,
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{target: inputA}
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);
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expect(output).toBe(inputA);
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});
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it('calculates the difference for each pixel', () => {
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const output = Composition.subtract(inputA, inputB);
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expect(output.get(0, 0)).toEqual(0);
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expect(output.get(1, 0)).toEqual(1);
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expect(output.get(0, 1)).toEqual(-1);
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expect(output.get(1, 1)).toEqual(0);
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});
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});
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describe('ImageRegion.subtract', () => {
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it('is added to the ImageRegion prototype', () => {
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expect(inputA.subtract).toEqual(jasmine.any(Function));
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});
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it('invokes subtract', () => {
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const output = inputA.subtract(inputB);
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expect(output.get(0, 1)).toEqual(-1);
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});
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});
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describe('ImageRegion.difference', () => {
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it('is added to the ImageRegion prototype', () => {
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expect(inputA.difference).toEqual(jasmine.any(Function));
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});
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it('invokes abs(subtract)', () => {
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const output = inputA.difference(inputB);
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expect(output.get(0, 1)).toEqual(1);
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});
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});
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});
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