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150 lines
3.9 KiB
150 lines
3.9 KiB
var assert = require('assert');
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var moment = require('moment');
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var DataSet = require('../lib/DataSet');
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var DataView = require('../lib/DataView');
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// TODO: improve DataView tests, split up in one test per function
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describe('DataView', function () {
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it('should work', function () {
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var groups = new DataSet();
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// add items with different groups
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groups.add([
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{id: 1, content: 'Item 1', group: 1},
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{id: 2, content: 'Item 2', group: 2},
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{id: 3, content: 'Item 3', group: 2},
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{id: 4, content: 'Item 4', group: 1},
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{id: 5, content: 'Item 5', group: 3}
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]);
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var group2 = new DataView(groups, {
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filter: function (item) {
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return item.group == 2;
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}
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});
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// test getting the filtered data
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assert.deepEqual(group2.get(), [
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{id: 2, content: 'Item 2', group: 2},
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{id: 3, content: 'Item 3', group: 2}
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]);
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assert.equal(group2.length, 2);
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// test filtering the view contents
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assert.deepEqual(group2.get({
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filter: function (item) {
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return item.id > 2;
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}
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}), [
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{id: 3, content: 'Item 3', group: 2}
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]);
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// test event subscription
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var groupsTriggerCount = 0;
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groups.on('*', function () {
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groupsTriggerCount++;
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});
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var group2TriggerCount = 0;
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group2.on('*', function () {
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group2TriggerCount++;
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});
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groups.update({id:2, content: 'Item 2 (changed)'});
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assert.equal(groupsTriggerCount, 1);
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assert.equal(group2TriggerCount, 1);
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assert.equal(group2.length, 2);
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groups.update({id:5, content: 'Item 5 (changed)'});
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assert.equal(groupsTriggerCount, 2);
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assert.equal(group2TriggerCount, 1);
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assert.equal(group2.length, 2);
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// detach the view from groups
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group2.setData(null);
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assert.equal(groupsTriggerCount, 2);
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assert.equal(group2TriggerCount, 2);
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assert.equal(group2.length, 0);
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groups.update({id:2, content: 'Item 2 (changed again)'});
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assert.equal(groupsTriggerCount, 3);
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assert.equal(group2TriggerCount, 2);
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// test updating of .length property
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group2.setData(groups);
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assert.equal(group2.length, 2);
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// add a new item
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groups.add({id: 6, content: 'Item 6', group: 2});
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assert.equal(group2.length, 3);
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// change an items group to 2
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groups.update({id: 4, group: 2});
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assert.equal(group2.length, 4);
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// change an items group to 1
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groups.update({id: 4, group: 1});
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assert.equal(group2.length, 3);
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// remove an item
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groups.remove(2);
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assert.equal(group2.length, 2);
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// remove all items
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groups.clear();
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assert.equal(group2.length, 0);
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});
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it('should refresh a DataView with filter', function () {
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var data = new DataSet([
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{id:1, value:2},
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{id:2, value:4},
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{id:3, value:7}
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]);
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var threshold = 5;
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// create a view. The view has a filter with a dynamic property `threshold`
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var view = new DataView(data, {
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filter: function (item) {
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return item.value < threshold;
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}
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});
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var added, updated, removed;
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view.on('add', function (event, props) {added = added.concat(props.items)});
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view.on('update', function (event, props) {updated = updated.concat(props.items)});
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view.on('remove', function (event, props) {removed = removed.concat(props.items)});
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assert.deepEqual(view.get(), [
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{id:1, value:2},
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{id:2, value:4}
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]);
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// change the threshold to 3
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added = [];
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updated = [];
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removed = [];
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threshold = 3;
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view.refresh();
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assert.deepEqual(view.get(), [{id:1, value:2}]);
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assert.deepEqual(added, []);
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assert.deepEqual(updated, []);
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assert.deepEqual(removed, [2]);
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// change threshold to 8
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added = [];
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updated = [];
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removed = [];
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threshold = 8;
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view.refresh();
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assert.deepEqual(view.get(), [
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{id:1, value:2},
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{id:2, value:4},
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{id:3, value:7}
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]);
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assert.deepEqual(added, [2, 3]);
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assert.deepEqual(updated, []);
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assert.deepEqual(removed, []);
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})
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});
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