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const {color, getHoverColor} = Chart.helpers;
describe('Color helper', function() {
function isColorInstance(obj) {
return typeof obj === 'object' && obj.valid;
}
it('should return a color when called with a color', function() {
expect(isColorInstance(color('rgb(1, 2, 3)'))).toBe(true);
});
});
describe('Background hover color helper', function() {
it('should return a modified version of color when called with a color', function() {
var originalColorRGB = 'rgb(70, 191, 189)';
expect(getHoverColor('#46BFBD')).not.toEqual(originalColorRGB);
});
});
describe('color and getHoverColor helpers', function() {
it('should return a CanvasPattern when called with a CanvasPattern', function(done) {
var dots = new Image();
dots.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAMAAAAolt3jAAAAD1BMVEUAAAD///////////////+PQt5oAAAABXRSTlMAHlFhZsfk/BEAAAAqSURBVHgBY2BgZGJmYmSAAUYWEIDzmcBcJhiXGcxlRpPFrhdmMiqgvX0AcGIBEUAo6UAAAAAASUVORK5CYII=';
dots.onload = function() {
var chartContext = document.createElement('canvas').getContext('2d');
var patternCanvas = document.createElement('canvas');
var patternContext = patternCanvas.getContext('2d');
var pattern = patternContext.createPattern(dots, 'repeat');
patternContext.fillStyle = pattern;
var chartPattern = chartContext.createPattern(patternCanvas, 'repeat');
expect(color(chartPattern) instanceof CanvasPattern).toBe(true);
expect(getHoverColor(chartPattern) instanceof CanvasPattern).toBe(true);
done();
};
});
it('should return a CanvasGradient when called with a CanvasGradient', function() {
var context = document.createElement('canvas').getContext('2d');
var gradient = context.createLinearGradient(0, 1, 2, 3);
expect(color(gradient) instanceof CanvasGradient).toBe(true);
expect(getHoverColor(gradient) instanceof CanvasGradient).toBe(true);
});
});
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