text: describe('Chart.controllers.doughnut', function() {
  	it('should be registered as dataset controller', function() {
  		expect(typeof Chart.controllers.doughnut).toBe('function');
  		expect(Chart.controllers.doughnut).toBe(Chart.controllers.pie);
  	});
  
  	it('should be constructed', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: []
  				}],
  				labels: []
  			}
  		});
  
  		var meta = chart.getDatasetMeta(0);
  		expect(meta.type).toBe('doughnut');
  		expect(meta.controller).not.toBe(undefined);
  		expect(meta.controller.index).toBe(0);
  		expect(meta.data).toEqual([]);
  
  		meta.controller.updateIndex(1);
  		expect(meta.controller.index).toBe(1);
  	});
  
  	it('should create arc elements for each data item during initialization', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: [10, 15, 0, 4]
  				}],
  				labels: []
  			}
  		});
  
  		var meta = chart.getDatasetMeta(0);
  		expect(meta.data.length).toBe(4); // 4 rectangles created
  		expect(meta.data[0] instanceof Chart.elements.Arc).toBe(true);
  		expect(meta.data[1] instanceof Chart.elements.Arc).toBe(true);
  		expect(meta.data[2] instanceof Chart.elements.Arc).toBe(true);
  		expect(meta.data[3] instanceof Chart.elements.Arc).toBe(true);
  	});
  
  	it('should set the innerRadius to 0 if the config option is 0', function() {
  		var chart = window.acquireChart({
  			type: 'pie',
  			data: {
  				datasets: [{
  					data: [10, 15, 0, 4]
  				}],
  				labels: []
  			}
  		});
  
  		expect(chart.innerRadius).toBe(0);
  	});
  
  	it ('should reset and update elements', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: [1, 2, 3, 4],
  					hidden: true
  				}, {
  					data: [5, 6, 0, 7]
  				}, {
  					data: [8, 9, 10, 11]
  				}],
  				labels: ['label0', 'label1', 'label2', 'label3']
  			},
  			options: {
  				legend: false,
  				title: false,
  				animation: {
  					animateRotate: true,
  					animateScale: false
  				},
  				cutoutPercentage: 50,
  				rotation: Math.PI * -0.5,
  				circumference: Math.PI * 2.0,
  				elements: {
  					arc: {
  						backgroundColor: 'rgb(255, 0, 0)',
  						borderColor: 'rgb(0, 0, 255)',
  						borderWidth: 2
  					}
  				}
  			}
  		});
  
  		var meta = chart.getDatasetMeta(1);
  
  		meta.controller.reset(); // reset first
  
  		expect(meta.data.length).toBe(4);
  
  		[
  			{c: 0},
  			{c: 0},
  			{c: 0},
  			{c: 0}
  		].forEach(function(expected, i) {
  			expect(meta.data[i]._model.x).toBeCloseToPixel(256);
  			expect(meta.data[i]._model.y).toBeCloseToPixel(256);
  			expect(meta.data[i]._model.outerRadius).toBeCloseToPixel(254);
  			expect(meta.data[i]._model.innerRadius).toBeCloseToPixel(190);
  			expect(meta.data[i]._model.circumference).toBeCloseTo(expected.c, 8);
  			expect(meta.data[i]._model).toEqual(jasmine.objectContaining({
  				startAngle: Math.PI * -0.5,
  				endAngle: Math.PI * -0.5,
  				label: chart.data.labels[i],
  				backgroundColor: 'rgb(255, 0, 0)',
  				borderColor: 'rgb(0, 0, 255)',
  				borderWidth: 2
  			}));
  		});
  
  		chart.update();
  
  		[
  			{c: 1.7453292519, s: -1.5707963267, e: 0.1745329251},
  			{c: 2.0943951023, s: 0.1745329251, e: 2.2689280275},
  			{c: 0, s: 2.2689280275, e: 2.2689280275},
  			{c: 2.4434609527, s: 2.2689280275, e: 4.7123889803}
  		].forEach(function(expected, i) {
  			expect(meta.data[i]._model.x).toBeCloseToPixel(256);
  			expect(meta.data[i]._model.y).toBeCloseToPixel(256);
  			expect(meta.data[i]._model.outerRadius).toBeCloseToPixel(254);
  			expect(meta.data[i]._model.innerRadius).toBeCloseToPixel(190);
  			expect(meta.data[i]._model.circumference).toBeCloseTo(expected.c, 8);
  			expect(meta.data[i]._model.startAngle).toBeCloseTo(expected.s, 8);
  			expect(meta.data[i]._model.endAngle).toBeCloseTo(expected.e, 8);
  			expect(meta.data[i]._model).toEqual(jasmine.objectContaining({
  				label: chart.data.labels[i],
  				backgroundColor: 'rgb(255, 0, 0)',
  				borderColor: 'rgb(0, 0, 255)',
  				borderWidth: 2
  			}));
  		});
  
  		// Change the amount of data and ensure that arcs are updated accordingly
  		chart.data.datasets[1].data = [1, 2]; // remove 2 elements from dataset 0
  		chart.update();
  
  		expect(meta.data.length).toBe(2);
  		expect(meta.data[0] instanceof Chart.elements.Arc).toBe(true);
  		expect(meta.data[1] instanceof Chart.elements.Arc).toBe(true);
  
  		// Add data
  		chart.data.datasets[1].data = [1, 2, 3, 4];
  		chart.update();
  
  		expect(meta.data.length).toBe(4);
  		expect(meta.data[0] instanceof Chart.elements.Arc).toBe(true);
  		expect(meta.data[1] instanceof Chart.elements.Arc).toBe(true);
  		expect(meta.data[2] instanceof Chart.elements.Arc).toBe(true);
  		expect(meta.data[3] instanceof Chart.elements.Arc).toBe(true);
  	});
  
  	it ('should rotate and limit circumference', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: [2, 4],
  					hidden: true
  				}, {
  					data: [1, 3]
  				}, {
  					data: [1, 0]
  				}],
  				labels: ['label0', 'label1']
  			},
  			options: {
  				legend: false,
  				title: false,
  				cutoutPercentage: 50,
  				rotation: Math.PI,
  				circumference: Math.PI * 0.5,
  				elements: {
  					arc: {
  						backgroundColor: 'rgb(255, 0, 0)',
  						borderColor: 'rgb(0, 0, 255)',
  						borderWidth: 2
  					}
  				}
  			}
  		});
  
  		var meta = chart.getDatasetMeta(1);
  
  		expect(meta.data.length).toBe(2);
  
  		// Only startAngle, endAngle and circumference should be different.
  		[
  			{c: Math.PI / 8, s: Math.PI, e: Math.PI + Math.PI / 8},
  			{c: 3 * Math.PI / 8, s: Math.PI + Math.PI / 8, e: Math.PI + Math.PI / 2}
  		].forEach(function(expected, i) {
  			expect(meta.data[i]._model.x).toBeCloseToPixel(511);
  			expect(meta.data[i]._model.y).toBeCloseToPixel(511);
  			expect(meta.data[i]._model.outerRadius).toBeCloseToPixel(510);
  			expect(meta.data[i]._model.innerRadius).toBeCloseToPixel(382);
  			expect(meta.data[i]._model.circumference).toBeCloseTo(expected.c, 8);
  			expect(meta.data[i]._model.startAngle).toBeCloseTo(expected.s, 8);
  			expect(meta.data[i]._model.endAngle).toBeCloseTo(expected.e, 8);
  		});
  	});
  
  	it('should treat negative values as positive', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: [-1, -3]
  				}],
  				labels: ['label0', 'label1']
  			},
  			options: {
  				legend: false,
  				title: false,
  				cutoutPercentage: 50,
  				rotation: Math.PI,
  				circumference: Math.PI * 0.5,
  				elements: {
  					arc: {
  						backgroundColor: 'rgb(255, 0, 0)',
  						borderColor: 'rgb(0, 0, 255)',
  						borderWidth: 2
  					}
  				}
  			}
  		});
  
  		var meta = chart.getDatasetMeta(0);
  
  		expect(meta.data.length).toBe(2);
  
  		// Only startAngle, endAngle and circumference should be different.
  		[
  			{c: Math.PI / 8, s: Math.PI, e: Math.PI + Math.PI / 8},
  			{c: 3 * Math.PI / 8, s: Math.PI + Math.PI / 8, e: Math.PI + Math.PI / 2}
  		].forEach(function(expected, i) {
  			expect(meta.data[i]._model.circumference).toBeCloseTo(expected.c, 8);
  			expect(meta.data[i]._model.startAngle).toBeCloseTo(expected.s, 8);
  			expect(meta.data[i]._model.endAngle).toBeCloseTo(expected.e, 8);
  		});
  	});
  
  	it ('should draw all arcs', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: [10, 15, 0, 4]
  				}],
  				labels: ['label0', 'label1', 'label2', 'label3']
  			}
  		});
  
  		var meta = chart.getDatasetMeta(0);
  
  		spyOn(meta.data[0], 'draw');
  		spyOn(meta.data[1], 'draw');
  		spyOn(meta.data[2], 'draw');
  		spyOn(meta.data[3], 'draw');
  
  		chart.update();
  
  		expect(meta.data[0].draw.calls.count()).toBe(1);
  		expect(meta.data[1].draw.calls.count()).toBe(1);
  		expect(meta.data[2].draw.calls.count()).toBe(1);
  		expect(meta.data[3].draw.calls.count()).toBe(1);
  	});
  
  	it ('should set the hover style of an arc', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: [10, 15, 0, 4]
  				}],
  				labels: ['label0', 'label1', 'label2', 'label3']
  			},
  			options: {
  				elements: {
  					arc: {
  						backgroundColor: 'rgb(255, 0, 0)',
  						borderColor: 'rgb(0, 0, 255)',
  						borderWidth: 2,
  					}
  				}
  			}
  		});
  
  		var meta = chart.getDatasetMeta(0);
  		var arc = meta.data[0];
  
  		meta.controller.setHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(230, 0, 0)');
  		expect(arc._model.borderColor).toBe('rgb(0, 0, 230)');
  		expect(arc._model.borderWidth).toBe(2);
  
  		// Set a dataset style to take precedence
  		chart.data.datasets[0].hoverBackgroundColor = 'rgb(9, 9, 9)';
  		chart.data.datasets[0].hoverBorderColor = 'rgb(18, 18, 18)';
  		chart.data.datasets[0].hoverBorderWidth = 1.56;
  
  		meta.controller.setHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(9, 9, 9)');
  		expect(arc._model.borderColor).toBe('rgb(18, 18, 18)');
  		expect(arc._model.borderWidth).toBe(1.56);
  
  		// Dataset styles can be an array
  		chart.data.datasets[0].hoverBackgroundColor = ['rgb(255, 255, 255)', 'rgb(9, 9, 9)'];
  		chart.data.datasets[0].hoverBorderColor = ['rgb(18, 18, 18)'];
  		chart.data.datasets[0].hoverBorderWidth = [0.1, 1.56];
  
  		meta.controller.setHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(255, 255, 255)');
  		expect(arc._model.borderColor).toBe('rgb(18, 18, 18)');
  		expect(arc._model.borderWidth).toBe(0.1);
  
  		// Element custom styles also work
  		arc.custom = {
  			hoverBackgroundColor: 'rgb(7, 7, 7)',
  			hoverBorderColor: 'rgb(17, 17, 17)',
  			hoverBorderWidth: 3.14159,
  		};
  
  		meta.controller.setHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(7, 7, 7)');
  		expect(arc._model.borderColor).toBe('rgb(17, 17, 17)');
  		expect(arc._model.borderWidth).toBe(3.14159);
  	});
  
  	it ('should unset the hover style of an arc', function() {
  		var chart = window.acquireChart({
  			type: 'doughnut',
  			data: {
  				datasets: [{
  					data: [10, 15, 0, 4]
  				}],
  				labels: ['label0', 'label1', 'label2', 'label3']
  			},
  			options: {
  				elements: {
  					arc: {
  						backgroundColor: 'rgb(255, 0, 0)',
  						borderColor: 'rgb(0, 0, 255)',
  						borderWidth: 2,
  					}
  				}
  			}
  		});
  
  		var meta = chart.getDatasetMeta(0);
  		var arc = meta.data[0];
  
  		chart.update();
  		meta.controller.setHoverStyle(arc);
  		meta.controller.removeHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(255, 0, 0)');
  		expect(arc._model.borderColor).toBe('rgb(0, 0, 255)');
  		expect(arc._model.borderWidth).toBe(2);
  
  		// Set a dataset style to take precedence
  		chart.data.datasets[0].backgroundColor = 'rgb(9, 9, 9)';
  		chart.data.datasets[0].borderColor = 'rgb(18, 18, 18)';
  		chart.data.datasets[0].borderWidth = 1.56;
  
  		chart.update();
  		meta.controller.setHoverStyle(arc);
  		meta.controller.removeHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(9, 9, 9)');
  		expect(arc._model.borderColor).toBe('rgb(18, 18, 18)');
  		expect(arc._model.borderWidth).toBe(1.56);
  
  		// Dataset styles can be an array
  		chart.data.datasets[0].backgroundColor = ['rgb(255, 255, 255)', 'rgb(9, 9, 9)'];
  		chart.data.datasets[0].borderColor = ['rgb(18, 18, 18)'];
  		chart.data.datasets[0].borderWidth = [0.1, 1.56];
  
  		chart.update();
  		meta.controller.setHoverStyle(arc);
  		meta.controller.removeHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(255, 255, 255)');
  		expect(arc._model.borderColor).toBe('rgb(18, 18, 18)');
  		expect(arc._model.borderWidth).toBe(0.1);
  
  		// Element custom styles also work
  		arc.custom = {
  			backgroundColor: 'rgb(7, 7, 7)',
  			borderColor: 'rgb(17, 17, 17)',
  			borderWidth: 3.14159,
  		};
  
  		chart.update();
  		meta.controller.setHoverStyle(arc);
  		meta.controller.removeHoverStyle(arc);
  		expect(arc._model.backgroundColor).toBe('rgb(7, 7, 7)');
  		expect(arc._model.borderColor).toBe('rgb(17, 17, 17)');
  		expect(arc._model.borderWidth).toBe(3.14159);
  	});
  });
  