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describe('Chart.DatasetController', function() {
it('should listen for dataset data insertions or removals', function() {
var data = [0, 1, 2, 3, 4, 5];
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data
}]
}
});
var controller = chart.getDatasetMeta(0).controller;
var methods = [
'onDataPush',
'onDataPop',
'onDataShift',
'onDataSplice',
'onDataUnshift'
];
methods.forEach(function(method) {
spyOn(controller, method);
});
data.push(6, 7, 8);
data.push(9);
data.pop();
data.shift();
data.shift();
data.shift();
data.splice(1, 4, 10, 11);
data.unshift(12, 13, 14, 15);
data.unshift(16, 17);
[2, 1, 3, 1, 2].forEach(function(expected, index) {
expect(controller[methods[index]].calls.count()).toBe(expected);
});
});
describe('inextensible data', function() {
it('should handle a frozen data object', function() {
function createChart() {
var data = Object.freeze([0, 1, 2, 3, 4, 5]);
expect(Object.isExtensible(data)).toBeFalsy();
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data
}]
}
});
var dataset = chart.data.datasets[0];
dataset.data = Object.freeze([5, 4, 3, 2, 1, 0]);
expect(Object.isExtensible(dataset.data)).toBeFalsy();
chart.update();
// Tests that the unlisten path also works for frozen objects
chart.destroy();
}
expect(createChart).not.toThrow();
});
it('should handle a sealed data object', function() {
function createChart() {
var data = Object.seal([0, 1, 2, 3, 4, 5]);
expect(Object.isExtensible(data)).toBeFalsy();
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data
}]
}
});
var dataset = chart.data.datasets[0];
dataset.data = Object.seal([5, 4, 3, 2, 1, 0]);
expect(Object.isExtensible(dataset.data)).toBeFalsy();
chart.update();
// Tests that the unlisten path also works for frozen objects
chart.destroy();
}
expect(createChart).not.toThrow();
});
it('should handle an unextendable data object', function() {
function createChart() {
var data = Object.preventExtensions([0, 1, 2, 3, 4, 5]);
expect(Object.isExtensible(data)).toBeFalsy();
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data
}]
}
});
var dataset = chart.data.datasets[0];
dataset.data = Object.preventExtensions([5, 4, 3, 2, 1, 0]);
expect(Object.isExtensible(dataset.data)).toBeFalsy();
chart.update();
// Tests that the unlisten path also works for frozen objects
chart.destroy();
}
expect(createChart).not.toThrow();
});
});
it('should synchronize metadata when data are inserted or removed', function() {
var data = [0, 1, 2, 3, 4, 5];
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data
}]
}
});
var meta = chart.getDatasetMeta(0);
var first, second, last;
first = meta.data[0];
last = meta.data[5];
data.push(6, 7, 8);
data.push(9);
expect(meta.data.length).toBe(10);
expect(meta.data[0]).toBe(first);
expect(meta.data[5]).toBe(last);
last = meta.data[9];
data.pop();
expect(meta.data.length).toBe(9);
expect(meta.data[0]).toBe(first);
expect(meta.data.indexOf(last)).toBe(-1);
last = meta.data[8];
data.shift();
data.shift();
data.shift();
expect(meta.data.length).toBe(6);
expect(meta.data.indexOf(first)).toBe(-1);
expect(meta.data[5]).toBe(last);
first = meta.data[0];
second = meta.data[1];
last = meta.data[5];
data.splice(1, 4, 10, 11);
expect(meta.data.length).toBe(4);
expect(meta.data[0]).toBe(first);
expect(meta.data[3]).toBe(last);
expect(meta.data.indexOf(second)).toBe(-1);
data.unshift(12, 13, 14, 15);
data.unshift(16, 17);
expect(meta.data.length).toBe(10);
expect(meta.data[6]).toBe(first);
expect(meta.data[9]).toBe(last);
});
it('should re-synchronize metadata when the data object reference changes', function() {
var data0 = [0, 1, 2, 3, 4, 5];
var data1 = [6, 7, 8];
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data0
}]
}
});
var meta = chart.getDatasetMeta(0);
expect(meta.data.length).toBe(6);
chart.data.datasets[0].data = data1;
chart.update();
expect(meta.data.length).toBe(3);
data1.push(9, 10, 11);
expect(meta.data.length).toBe(6);
});
it('should re-synchronize metadata when data are unusually altered', function() {
var data = [0, 1, 2, 3, 4, 5];
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data
}]
}
});
var meta = chart.getDatasetMeta(0);
expect(meta.data.length).toBe(6);
data.length = 2;
chart.update();
expect(meta.data.length).toBe(2);
data.length = 42;
chart.update();
expect(meta.data.length).toBe(42);
});
it('should cleanup attached properties when the reference changes or when the chart is destroyed', function() {
var data0 = [0, 1, 2, 3, 4, 5];
var data1 = [6, 7, 8];
var chart = acquireChart({
type: 'line',
data: {
datasets: [{
data: data0
}]
}
});
var hooks = ['push', 'pop', 'shift', 'splice', 'unshift'];
expect(data0._chartjs).toBeDefined();
hooks.forEach(function(hook) {
expect(data0[hook]).not.toBe(Array.prototype[hook]);
});
expect(data1._chartjs).not.toBeDefined();
hooks.forEach(function(hook) {
expect(data1[hook]).toBe(Array.prototype[hook]);
});
chart.data.datasets[0].data = data1;
chart.update();
expect(data0._chartjs).not.toBeDefined();
hooks.forEach(function(hook) {
expect(data0[hook]).toBe(Array.prototype[hook]);
});
expect(data1._chartjs).toBeDefined();
hooks.forEach(function(hook) {
expect(data1[hook]).not.toBe(Array.prototype[hook]);
});
chart.destroy();
expect(data1._chartjs).not.toBeDefined();
hooks.forEach(function(hook) {
expect(data1[hook]).toBe(Array.prototype[hook]);
});
});
});