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vendors/Chart.js/test/core.element.tests.js

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+// Test the core element functionality
+describe('Core element tests', function() {
+	it ('should transition model properties', function() {
+		var element = new Chart.Element({
+			_model: {
+				numberProp: 0,
+				numberProp2: 100,
+				_underscoreProp: 0,
+				stringProp: 'abc',
+				objectProp: {
+					myObject: true
+				},
+				colorProp: 'rgb(0, 0, 0)'
+			}
+		});
+
+		// First transition clones model into view
+		element.transition(0.25);
+		expect(element._view).toEqual(element._model);
+		expect(element._start).toEqual(element._model); // also cloned
+
+		expect(element._view.objectProp).toBe(element._model.objectProp); // not cloned
+		expect(element._start.objectProp).toEqual(element._model.objectProp); // not cloned
+
+		element._model.numberProp = 100;
+		element._model.numberProp2 = 250;
+		element._model._underscoreProp = 200;
+		element._model.stringProp = 'def'
+		element._model.newStringProp = 'newString';
+		element._model.colorProp = 'rgb(255, 255, 0)'
+
+		element.transition(0.25);
+		expect(element._view).toEqual({
+			numberProp: 25,
+			numberProp2: 137.5,
+			_underscoreProp: 0, // underscore props are not transition to a new value
+			stringProp: 'def',
+			newStringProp: 'newString',
+			objectProp: {
+				myObject: true
+			},
+			colorProp: 'rgb(64, 64, 0)',
+		});
+	});
+});