quaggaJS/test/spec/barcode_locator.spec.js

const BarcodeLocator = require('../../src/locator/barcode_locator');
const Config = require('../../src/config/config');
const merge = require('lodash/object/merge');

describe('checkImageConstraints', function() {
    var config,
        inputStream,
        imageSize,
        streamConfig = {};

    beforeEach(function() {
        imageSize = {
            x: 640, y: 480
        };
        config = merge({}, Config);
        inputStream = {
            getWidth: function() {
                return imageSize.x;
            },
            getHeight: function() {
                return imageSize.y;
            },
            setWidth: function() {},
            setHeight: function() {},
            setTopRight: function() {},
            setCanvasSize: function() {},
            getConfig: function() {
                return streamConfig;
            }
        };
        sinon.stub(inputStream, "setWidth", function(width) {
            imageSize.x = width;
        });
        sinon.stub(inputStream, "setHeight", function(height) {
            imageSize.y = height;
        });
        sinon.stub(inputStream, "setTopRight");
        sinon.stub(inputStream, "setCanvasSize");
    });

    afterEach(function() {
        inputStream.setWidth.restore();
        inputStream.setHeight.restore();
    });

    it('should not adjust the image-size if not needed', function() {
        var expected = {x: imageSize.x, y: imageSize.y};
        BarcodeLocator.checkImageConstraints(inputStream, config.locator);
        expect(inputStream.getWidth()).to.be.equal(expected.x);
        expect(inputStream.getHeight()).to.be.equal(expected.y);
    });

    it('should adjust the image-size', function() {
        var expected = {x: imageSize.x, y: imageSize.y};

        config.locator.halfSample = true;
        imageSize.y += 1;
        BarcodeLocator.checkImageConstraints(inputStream, config.locator);
        expect(inputStream.getWidth()).to.be.equal(expected.x);
        expect(inputStream.getHeight()).to.be.equal(expected.y);
    });

    it('should adjust the image-size', function() {
        var expected = {x: imageSize.x, y: imageSize.y};

        imageSize.y += 1;
        config.locator.halfSample = false;
        BarcodeLocator.checkImageConstraints(inputStream, config.locator);
        expect(inputStream.getHeight()).to.be.equal(expected.y);
        expect(inputStream.getWidth()).to.be.equal(expected.x);
    });

    it("should take the defined area into account", function() {
        var expectedSize = {
                x: 420,
                y: 315
            },
            expectedTopRight = {
                x: 115,
                y: 52
            },
            expectedCanvasSize = {
                x: 640,
                y: 480
            };

        streamConfig.area = {
            top: "11%",
            right: "15%",
            bottom: "20%",
            left: "18%"
        };

        config.locator.halfSample = false;
        BarcodeLocator.checkImageConstraints(inputStream, config.locator);
        expect(inputStream.getHeight()).to.be.equal(expectedSize.y);
        expect(inputStream.getWidth()).to.be.equal(expectedSize.x);
        expect(inputStream.setTopRight.getCall(0).args[0]).to.deep.equal(expectedTopRight);
        expect(inputStream.setCanvasSize.getCall(0).args[0]).to.deep.equal(expectedCanvasSize);
    });

    it("should return the original size if set to full image", function() {
        var expectedSize = {
                x: 640,
                y: 480
            },
            expectedTopRight = {
                x: 0,
                y: 0
            },
            expectedCanvasSize = {
                x: 640,
                y: 480
            };

        streamConfig.area = {
            top: "0%",
            right: "0%",
            bottom: "0%",
            left: "0%"
        };

        config.locator.halfSample = false;
        BarcodeLocator.checkImageConstraints(inputStream, config.locator);
        expect(inputStream.getHeight()).to.be.equal(expectedSize.y);
        expect(inputStream.getWidth()).to.be.equal(expectedSize.x);
        expect(inputStream.setTopRight.getCall(0).args[0]).to.deep.equal(expectedTopRight);
        expect(inputStream.setCanvasSize.getCall(0).args[0]).to.deep.equal(expectedCanvasSize);
    });
});