function getLabels(scale) {
	return scale.ticks.map(t => t.label);
}

describe('Logarithmic Scale tests', function() {
	it('should register', function() {
		var Constructor = Chart.registry.getScale('logarithmic');
		expect(Constructor).not.toBe(undefined);
		expect(typeof Constructor).toBe('function');
	});

	it('should have the correct default config', function() {
		var defaultConfig = Chart.defaults.scales.logarithmic;
		expect(defaultConfig).toEqual({
			ticks: {
				callback: Chart.Ticks.formatters.logarithmic,
				major: {
					enabled: true
				}
			}
		});

		// Is this actually a function
		expect(defaultConfig.ticks.callback).toEqual(jasmine.any(Function));
	});

	it('should correctly determine the max & min data values', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'y',
					data: [42, 1000, 64, 100],
				}, {
					yAxisID: 'y1',
					data: [10, 5, 5000, 78, 450]
				}, {
					yAxisID: 'y1',
					data: [150]
				}, {
					yAxisID: 'y2',
					data: [20, 0, 150, 1800, 3040]
				}, {
					yAxisID: 'y3',
					data: [67, 0.0004, 0, 820, 0.001]
				}],
				labels: ['a', 'b', 'c', 'd', 'e']
			},
			options: {
				scales: {
					y: {
						id: 'y',
						type: 'logarithmic'
					},
					y1: {
						type: 'logarithmic',
						position: 'right'
					},
					y2: {
						type: 'logarithmic',
						position: 'right'
					},
					y3: {
						position: 'right',
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y).not.toEqual(undefined); // must construct
		expect(chart.scales.y.min).toBe(10);
		expect(chart.scales.y.max).toBe(1000);

		expect(chart.scales.y1).not.toEqual(undefined); // must construct
		expect(chart.scales.y1.min).toBe(1);
		expect(chart.scales.y1.max).toBe(5000);

		expect(chart.scales.y2).not.toEqual(undefined); // must construct
		expect(chart.scales.y2.min).toBe(10);
		expect(chart.scales.y2.max).toBe(4000);

		expect(chart.scales.y3).not.toEqual(undefined); // must construct
		expect(chart.scales.y3.min).toBeCloseTo(0.0001, 4);
		expect(chart.scales.y3.max).toBe(900);
	});

	it('should correctly determine the max & min of string data values', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					yAxisID: 'y',
					data: ['42', '1000', '64', '100'],
				}, {
					yAxisID: 'y1',
					data: ['10', '5', '5000', '78', '450']
				}, {
					yAxisID: 'y1',
					data: ['150']
				}, {
					yAxisID: 'y2',
					data: ['20', '0', '150', '1800', '3040']
				}, {
					yAxisID: 'y3',
					data: ['67', '0.0004', '0', '820', '0.001']
				}],
				labels: ['a', 'b', 'c', 'd', 'e']
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic'
					},
					y1: {
						position: 'right',
						type: 'logarithmic'
					},
					y2: {
						position: 'right',
						type: 'logarithmic'
					},
					y3: {
						position: 'right',
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y).not.toEqual(undefined); // must construct
		expect(chart.scales.y.min).toBe(10);
		expect(chart.scales.y.max).toBe(1000);

		expect(chart.scales.y1).not.toEqual(undefined); // must construct
		expect(chart.scales.y1.min).toBe(1);
		expect(chart.scales.y1.max).toBe(5000);

		expect(chart.scales.y2).not.toEqual(undefined); // must construct
		expect(chart.scales.y2.min).toBe(10);
		expect(chart.scales.y2.max).toBe(4000);

		expect(chart.scales.y3).not.toEqual(undefined); // must construct
		expect(chart.scales.y3.min).toBeCloseTo(0.0001, 4);
		expect(chart.scales.y3.max).toBe(900);
	});

	it('should correctly determine the max & min data values when there are hidden datasets', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					yAxisID: 'y1',
					data: [10, 5, 5000, 78, 450]
				}, {
					yAxisID: 'y',
					data: [42, 1000, 64, 100],
				}, {
					yAxisID: 'y1',
					data: [50000],
					hidden: true
				}, {
					yAxisID: 'y2',
					data: [20, 0, 7400, 14, 291]
				}, {
					yAxisID: 'y2',
					data: [6, 0.0007, 9, 890, 60000],
					hidden: true
				}],
				labels: ['a', 'b', 'c', 'd', 'e']
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic'
					},
					y1: {
						position: 'right',
						type: 'logarithmic'
					},
					y2: {
						position: 'right',
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y1).not.toEqual(undefined); // must construct
		expect(chart.scales.y1.min).toBe(1);
		expect(chart.scales.y1.max).toBe(5000);

		expect(chart.scales.y2).not.toEqual(undefined); // must construct
		expect(chart.scales.y2.min).toBe(10);
		expect(chart.scales.y2.max).toBe(8000);
	});

	it('should correctly determine the max & min data values when there is NaN data', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'y',
					data: [undefined, 10, null, 5, 5000, NaN, 78, 450]
				}, {
					yAxisID: 'y',
					data: [undefined, 28, null, 1000, 500, NaN, 50, 42, Infinity, -Infinity]
				}, {
					yAxisID: 'y1',
					data: [undefined, 30, null, 9400, 0, NaN, 54, 836]
				}, {
					yAxisID: 'y1',
					data: [undefined, 0, null, 800, 9, NaN, 894, 21]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i']
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic'
					},
					y1: {
						position: 'right',
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y).not.toEqual(undefined); // must construct
		expect(chart.scales.y.min).toBe(1);
		expect(chart.scales.y.max).toBe(5000);

		// Turn on stacked mode since it uses it's own
		chart.options.scales.y.stacked = true;
		chart.update();

		expect(chart.scales.y.min).toBe(1);
		expect(chart.scales.y.max).toBe(6000);

		expect(chart.scales.y1).not.toEqual(undefined); // must construct
		expect(chart.scales.y1.min).toBe(1);
		expect(chart.scales.y1.max).toBe(10000);
	});

	it('should correctly determine the max & min for scatter data', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					data: [
						{x: 10, y: 100},
						{x: 2, y: 6},
						{x: 65, y: 121},
						{x: 99, y: 7}
					]
				}]
			},
			options: {
				scales: {
					x: {
						type: 'logarithmic',
						position: 'bottom'
					},
					y: {
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.x.min).toBe(1);
		expect(chart.scales.x.max).toBe(100);

		expect(chart.scales.y.min).toBe(1);
		expect(chart.scales.y.max).toBe(200);
	});

	it('should correctly determine the max & min for scatter data when 0 values are present', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					data: [
						{x: 7, y: 950},
						{x: 289, y: 0},
						{x: 0, y: 8},
						{x: 23, y: 0.04}
					]
				}]
			},
			options: {
				scales: {
					x: {
						type: 'logarithmic',
						position: 'bottom'
					},
					y: {
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.x.min).toBe(1);
		expect(chart.scales.x.max).toBe(30);

		expect(chart.scales.y.min).toBe(0.01);
		expect(chart.scales.y.max).toBe(1000);
	});

	it('should correctly determine the min and max data values when stacked mode is turned on', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					type: 'bar',
					yAxisID: 'y',
					data: [10, 5, 1, 5, 78, 100]
				}, {
					yAxisID: 'y1',
					data: [0, 1000],
				}, {
					type: 'bar',
					yAxisID: 'y',
					data: [150, 10, 10, 100, 10, 9]
				}, {
					type: 'line',
					yAxisID: 'y',
					data: [100, 100, 100, 100, 100, 100]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						stacked: true
					},
					y1: {
						position: 'right',
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y.min).toBe(0.1);
		expect(chart.scales.y.max).toBe(200);
	});

	it('should correctly determine the min and max data values when stacked mode is turned on ignoring hidden datasets', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'y',
					data: [10, 5, 1, 5, 78, 100],
					type: 'bar'
				}, {
					yAxisID: 'y1',
					data: [0, 1000],
					type: 'bar'
				}, {
					yAxisID: 'y',
					data: [150, 10, 10, 100, 10, 9],
					type: 'bar'
				}, {
					yAxisID: 'y',
					data: [10000, 10000, 10000, 10000, 10000, 10000],
					hidden: true,
					type: 'bar'
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						stacked: true
					},
					y1: {
						position: 'right',
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y.min).toBe(0.1);
		expect(chart.scales.y.max).toBe(200);
	});

	it('should ensure that the scale has a max and min that are not equal', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: []
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y.min).toBe(1);
		expect(chart.scales.y.max).toBe(10);

		chart.data.datasets[0].data = [0.15, 0.15];
		chart.update();

		expect(chart.scales.y.min).toBe(0.01);
		expect(chart.scales.y.max).toBe(1);
	});

	it('should use the min and max options', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [1, 1, 1, 2, 1, 0]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						min: 10,
						max: 1010,
						ticks: {
							callback: function(value) {
								return value;
							}
						}
					}
				}
			}
		});

		var yScale = chart.scales.y;
		var tickCount = yScale.ticks.length;
		expect(yScale.min).toBe(10);
		expect(yScale.max).toBe(1010);
		expect(yScale.ticks[0].value).toBe(10);
		expect(yScale.ticks[tickCount - 1].value).toBe(1010);
	});

	it('should ignore negative min and max options', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [1, 1, 1, 2, 1, 0]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						min: -10,
						max: -1010,
						ticks: {
							callback: function(value) {
								return value;
							}
						}
					}
				}
			}
		});

		var y = chart.scales.y;
		expect(y.min).toBe(0.1);
		expect(y.max).toBe(2);
	});

	it('should ignore invalid min and max options', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [1, 1, 1, 2, 1, 0]
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						min: 'zero',
						max: null,
						ticks: {
							callback: function(value) {
								return value;
							}
						}
					}
				}
			}
		});

		var y = chart.scales.y;
		expect(y.min).toBe(0.1);
		expect(y.max).toBe(2);
	});

	it('should generate tick marks', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [10, 5, 2, 25, 78]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						ticks: {
							callback: function(value) {
								return value;
							}
						}
					}
				}
			}
		});

		var scale = chart.scales.y;
		expect(getLabels(scale)).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80]);
		expect(scale.start).toEqual(1);
		expect(scale.end).toEqual(80);
	});

	it('should generate tick marks when 0 values are present', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [11, 0.8, 0, 28, 7]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						ticks: {
							callback: function(value) {
								return value;
							}
						}
					}
				}
			}
		});

		var scale = chart.scales.y;
		// Counts down because the lines are drawn top to bottom
		expect(getLabels(scale)).toEqual([0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30]);
		expect(scale.start).toEqual(0.1);
		expect(scale.end).toEqual(30);
	});


	it('should generate tick marks in the correct order in reversed mode', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					data: [10, 5, 1, 25, 78]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						reverse: true,
						ticks: {
							callback: function(value) {
								return value;
							}
						}
					}
				}
			}
		});

		var scale = chart.scales.y;
		expect(getLabels(scale)).toEqual([80, 70, 60, 50, 40, 30, 20, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1]);
		expect(scale.start).toEqual(80);
		expect(scale.end).toEqual(1);
	});

	it('should generate tick marks in the correct order in reversed mode when 0 values are present', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					data: [21, 9, 0, 10, 25]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						reverse: true,
						ticks: {
							callback: function(value) {
								return value;
							}
						}
					}
				}
			}
		});

		var scale = chart.scales.y;
		expect(getLabels(scale)).toEqual([30, 20, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1]);
		expect(scale.start).toEqual(30);
		expect(scale.end).toEqual(1);
	});

	it('should build labels using the default template', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					data: [10, 5, 1.1, 25, 0, 78]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic'
					}
				}
			}
		});

		expect(getLabels(chart.scales.y)).toEqual(['1', '2', '', '', '5', '', '', '', '', '10', '20', '', '', '50', '', '', '']);
	});

	it('should build labels using the user supplied callback', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [10, 5, 2, 25, 78]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						ticks: {
							callback: function(value, index) {
								return index.toString();
							}
						}
					}
				}
			}
		});

		// Just the index
		expect(getLabels(chart.scales.y)).toEqual(['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16']);
	});

	it('should correctly get the correct label for a data item', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'y',
					data: [10, 5, 5000, 78, 450]
				}, {
					yAxisID: 'y1',
					data: [1, 1000, 10, 100],
				}, {
					yAxisID: 'y',
					data: [150]
				}],
				labels: []
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic'
					},
					y1: {
						position: 'right',
						type: 'logarithmic'
					}
				}
			}
		});

		expect(chart.scales.y.getLabelForValue(150)).toBe('150');
	});

	describe('when', function() {
		var data = [
			{
				data: [1, 39],
				stack: 'stack'
			},
			{
				data: [1, 39],
				stack: 'stack'
			},
		];
		var dataWithEmptyStacks = [
			{
				data: []
			},
			{
				data: []
			}
		].concat(data);
		var config = [
			{
				axis: 'y',
				firstTick: 1, // start of the axis (minimum)
				describe: 'all stacks are defined'
			},
			{
				axis: 'y',
				data: dataWithEmptyStacks,
				firstTick: 1,
				describe: 'not all stacks are defined'
			},
			{
				axis: 'y',
				scale: {
					y: {
						min: 0
					}
				},
				firstTick: 0.1,
				describe: 'all stacks are defined and min: 0'
			},
			{
				axis: 'y',
				data: dataWithEmptyStacks,
				scale: {
					y: {
						min: 0
					}
				},
				firstTick: 0.1,
				describe: 'not stacks are defined and min: 0'
			},
			{
				axis: 'x',
				firstTick: 1,
				describe: 'all stacks are defined'
			},
			{
				axis: 'x',
				data: dataWithEmptyStacks,
				firstTick: 1,
				describe: 'not all stacks are defined'
			},
			{
				axis: 'x',
				scale: {
					x: {
						min: 0
					}
				},
				firstTick: 0.1,
				describe: 'all stacks are defined and min: 0'
			},
			{
				axis: 'x',
				data: dataWithEmptyStacks,
				scale: {
					x: {
						min: 0
					}
				},
				firstTick: 0.1,
				describe: 'not all stacks are defined and min: 0'
			},
		];
		config.forEach(function(setup) {
			var scaleConfig = {};
			var indexAxis, chartStart, chartEnd;

			if (setup.axis === 'x') {
				indexAxis = 'y';
				chartStart = 'left';
				chartEnd = 'right';
			} else {
				indexAxis = 'x';
				chartStart = 'bottom';
				chartEnd = 'top';
			}
			scaleConfig[setup.axis] = {
				type: 'logarithmic',
				beginAtZero: false
			};
			Object.assign(scaleConfig, setup.scale);
			scaleConfig[setup.axis].type = 'logarithmic';

			var description = 'dataset has stack option and ' + setup.describe
				+ ' and axis is "' + setup.axis + '";';
			describe(description, function() {
				it('should define the correct axis limits', function() {
					var chart = window.acquireChart({
						type: 'bar',
						data: {
							labels: ['category 1', 'category 2'],
							datasets: setup.data || data,
						},
						options: {
							indexAxis,
							scales: scaleConfig
						}
					});

					var axisID = setup.axis;
					var scale = chart.scales[axisID];
					var firstTick = setup.firstTick;
					var lastTick = 80; // last tick (should be first available tick after: 2 * 39)
					var start = chart.chartArea[chartStart];
					var end = chart.chartArea[chartEnd];

					expect(scale.getPixelForValue(firstTick)).toBeCloseToPixel(start);
					expect(scale.getPixelForValue(lastTick)).toBeCloseToPixel(end);

					expect(scale.getValueForPixel(start)).toBeCloseTo(firstTick, 4);
					expect(scale.getValueForPixel(end)).toBeCloseTo(lastTick, 4);

					chart.scales[axisID].options.reverse = true; // Reverse mode
					chart.update();

					// chartArea might have been resized in update
					start = chart.chartArea[chartEnd];
					end = chart.chartArea[chartStart];

					expect(scale.getPixelForValue(firstTick)).toBeCloseToPixel(start);
					expect(scale.getPixelForValue(lastTick)).toBeCloseToPixel(end);

					expect(scale.getValueForPixel(start)).toBeCloseTo(firstTick, 4);
					expect(scale.getValueForPixel(end)).toBeCloseTo(lastTick, 4);
				});
			});
		});
	});

	describe('when', function() {
		var config = [
			{
				dataset: [],
				firstTick: 1, // value of the first tick
				lastTick: 10, // value of the last tick
				describe: 'empty dataset, without min/max'
			},
			{
				dataset: [],
				scale: {stacked: true},
				firstTick: 1,
				lastTick: 10,
				describe: 'empty dataset, without min/max, with stacked: true'
			},
			{
				data: {
					datasets: [
						{data: [], stack: 'stack'},
						{data: [], stack: 'stack'},
					],
				},
				type: 'bar',
				firstTick: 1,
				lastTick: 10,
				describe: 'empty dataset with stack option, without min/max'
			},
			{
				dataset: [],
				scale: {min: 1},
				firstTick: 1,
				lastTick: 10,
				describe: 'empty dataset, min: 1, without max'
			},
			{
				dataset: [],
				scale: {max: 80},
				firstTick: 1,
				lastTick: 80,
				describe: 'empty dataset, max: 80, without min'
			},
			{
				dataset: [],
				scale: {max: 0.8},
				firstTick: 0.01,
				lastTick: 0.8,
				describe: 'empty dataset, max: 0.8, without min'
			},
			{
				dataset: [{x: 10, y: 10}, {x: 5, y: 5}, {x: 1, y: 1}, {x: 25, y: 25}, {x: 78, y: 78}],
				firstTick: 1,
				lastTick: 80,
				describe: 'dataset min point {x: 1, y: 1}, max point {x:78, y:78}'
			},
		];
		config.forEach(function(setup) {
			var axes = [
				{
					id: 'x', // horizontal scale
					start: 'left',
					end: 'right'
				},
				{
					id: 'y', // vertical scale
					start: 'bottom',
					end: 'top'
				}
			];
			axes.forEach(function(axis) {
				var expectation = 'min = ' + setup.firstTick + ', max = ' + setup.lastTick;
				describe(setup.describe + ' and axis is "' + axis.id + '"; expect: ' + expectation + ';', function() {
					beforeEach(function() {
						var xConfig = {
							type: 'logarithmic',
							position: 'bottom'
						};
						var yConfig = {
							type: 'logarithmic',
							position: 'left'
						};
						var data = setup.data || {
							datasets: [{
								data: setup.dataset
							}],
						};
						Object.assign(xConfig, setup.scale);
						Object.assign(yConfig, setup.scale);
						Object.assign(data, setup.data || {});
						this.chart = window.acquireChart({
							type: 'line',
							data: data,
							options: {
								scales: {
									x: xConfig,
									y: yConfig
								}
							}
						});
					});

					it('should get the correct pixel value for a point', function() {
						var chart = this.chart;
						var axisID = axis.id;
						var scale = chart.scales[axisID];
						var firstTick = setup.firstTick;
						var lastTick = setup.lastTick;
						var start = chart.chartArea[axis.start];
						var end = chart.chartArea[axis.end];

						expect(scale.getPixelForValue(firstTick)).toBeCloseToPixel(start);
						expect(scale.getPixelForValue(lastTick)).toBeCloseToPixel(end);
						expect(scale.getPixelForValue(0)).toBeCloseToPixel(start); // 0 is invalid, put it at the start.

						expect(scale.getValueForPixel(start)).toBeCloseTo(firstTick, 4);
						expect(scale.getValueForPixel(end)).toBeCloseTo(lastTick, 4);

						chart.scales[axisID].options.reverse = true; // Reverse mode
						chart.update();

						// chartArea might have been resized in update
						start = chart.chartArea[axis.end];
						end = chart.chartArea[axis.start];

						expect(scale.getPixelForValue(firstTick)).toBeCloseToPixel(start);
						expect(scale.getPixelForValue(lastTick)).toBeCloseToPixel(end);

						expect(scale.getValueForPixel(start)).toBeCloseTo(firstTick, 4);
						expect(scale.getValueForPixel(end)).toBeCloseTo(lastTick, 4);
					});
				});
			});
		});
	});

	describe('when', function() {
		var config = [
			{
				dataset: [],
				scale: {min: 0},
				lastTick: 10, // value of the last tick
				describe: 'empty dataset, min: 0, without max'
			},
			{
				dataset: [],
				scale: {min: 0, max: 80},
				lastTick: 80,
				describe: 'empty dataset, min: 0, max: 80'
			},
			{
				dataset: [],
				scale: {min: 0, max: 0.8},
				lastTick: 0.8,
				describe: 'empty dataset, min: 0, max: 0.8'
			},
			{
				dataset: [{x: 0, y: 0}, {x: 10, y: 10}, {x: 1.2, y: 1.2}, {x: 25, y: 25}, {x: 78, y: 78}],
				lastTick: 80,
				describe: 'dataset min point {x: 0, y: 0}, max point {x:78, y:78}'
			},
			{
				dataset: [{x: 0, y: 0}, {x: 10, y: 10}, {x: 6.3, y: 6.3}, {x: 25, y: 25}, {x: 78, y: 78}],
				lastTick: 80,
				describe: 'dataset min point {x: 0, y: 0}, max point {x:78, y:78}'
			},
			{
				dataset: [{x: 10, y: 10}, {x: 1.2, y: 1.2}, {x: 25, y: 25}, {x: 78, y: 78}],
				scale: {min: 0},
				lastTick: 80,
				describe: 'dataset min point {x: 1.2, y: 1.2}, max point {x:78, y:78}, min: 0'
			},
			{
				dataset: [{x: 10, y: 10}, {x: 6.3, y: 6.3}, {x: 25, y: 25}, {x: 78, y: 78}],
				scale: {min: 0},
				lastTick: 80,
				describe: 'dataset min point {x: 6.3, y: 6.3}, max point {x:78, y:78}, min: 0'
			},
		];
		config.forEach(function(setup) {
			var axes = [
				{
					id: 'x', // horizontal scale
					start: 'left',
					end: 'right'
				},
				{
					id: 'y', // vertical scale
					start: 'bottom',
					end: 'top'
				}
			];
			axes.forEach(function(axis) {
				var expectation = 'min = 0, max = ' + setup.lastTick;
				describe(setup.describe + ' and axis is "' + axis.id + '"; expect: ' + expectation + ';', function() {
					beforeEach(function() {
						var xConfig = {
							type: 'logarithmic',
							position: 'bottom'
						};
						var yConfig = {
							type: 'logarithmic',
							position: 'left'
						};
						var data = setup.data || {
							datasets: [{
								data: setup.dataset
							}],
						};
						Object.assign(xConfig, setup.scale);
						Object.assign(yConfig, setup.scale);
						Object.assign(data, setup.data || {});
						this.chart = window.acquireChart({
							type: 'line',
							data: data,
							options: {
								scales: {
									x: xConfig,
									y: yConfig
								}
							}
						});
					});

					it('should get the correct pixel value for a point', function() {
						var chart = this.chart;
						var axisID = axis.id;
						var scale = chart.scales[axisID];
						var lastTick = setup.lastTick;
						var start = chart.chartArea[axis.start];
						var end = chart.chartArea[axis.end];

						expect(scale.getPixelForValue(0)).toBeCloseToPixel(start);
						expect(scale.getPixelForValue(lastTick)).toBeCloseToPixel(end);

						expect(scale.getValueForPixel(start)).toBeCloseTo(scale.min, 4);
						expect(scale.getValueForPixel(end)).toBeCloseTo(lastTick, 4);

						chart.scales[axisID].options.reverse = true; // Reverse mode
						chart.update();

						// chartArea might have been resized in update
						start = chart.chartArea[axis.end];
						end = chart.chartArea[axis.start];

						expect(scale.getPixelForValue(0)).toBeCloseToPixel(start);
						expect(scale.getPixelForValue(lastTick)).toBeCloseToPixel(end);

						expect(scale.getValueForPixel(start)).toBeCloseTo(scale.min, 4);
						expect(scale.getValueForPixel(end)).toBeCloseTo(lastTick, 4);
					});
				});
			});
		});
	});

	it('Should correctly determine the max & min when no values provided and suggested minimum and maximum are set', function() {
		var chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					yAxisID: 'y',
					data: []
				}],
				labels: ['a', 'b', 'c', 'd', 'e', 'f']
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						suggestedMin: 10,
						suggestedMax: 100
					}
				}
			}
		});

		expect(chart.scales.y).not.toEqual(undefined); // must construct
		expect(chart.scales.y.min).toBe(10);
		expect(chart.scales.y.max).toBe(100);
	});

	it('Should bound to data', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				labels: ['a', 'b'],
				datasets: [{
					data: [1.1, 99]
				}]
			},
			options: {
				scales: {
					y: {
						type: 'logarithmic',
						bounds: 'data'
					}
				}
			}
		});

		expect(chart.scales.y.min).toEqual(1.1);
		expect(chart.scales.y.max).toEqual(99);
	});
});