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67 lines
1.7 KiB
JavaScript
67 lines
1.7 KiB
JavaScript
var assert = require('assert');
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var snabbdom = require('../snabbdom');
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var patch = snabbdom.init([
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]);
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var h = require('../h');
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var thunk = require('../thunk');
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describe('thunk', function() {
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var elm, vnode0;
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beforeEach(function() {
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elm = document.createElement('div');
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vnode0 = elm;
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});
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it('returns vnode with data and render function', function() {
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function numberInSpan(n) {
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return h('span', 'Number is ' + n);
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}
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var vnode = thunk('num', numberInSpan, 22);
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assert.deepEqual(vnode.sel, 'thunknum');
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assert.deepEqual(vnode.data.args, [22]);
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});
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it('only calls render function on data change', function() {
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var called = 0;
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function numberInSpan(n) {
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called++;
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return h('span', 'Number is ' + n);
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}
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var vnode1 = h('div', [
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thunk('num', numberInSpan, 1)
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]);
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var vnode2 = h('div', [
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thunk('num', numberInSpan, 1)
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]);
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var vnode3 = h('div', [
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thunk('num', numberInSpan, 2)
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]);
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patch(vnode0, vnode1);
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patch(vnode1, vnode2);
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patch(vnode2, vnode3);
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assert.equal(called, 2);
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});
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it('renders correctly', function() {
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var called = 0;
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function numberInSpan(n) {
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called++;
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return h('span', 'Number is ' + n);
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}
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var vnode1 = h('div', [
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thunk('num', numberInSpan, 1)
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]);
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var vnode2 = h('div', [
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thunk('num', numberInSpan, 1)
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]);
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var vnode3 = h('div', [
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thunk('num', numberInSpan, 2)
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]);
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patch(vnode0, vnode1);
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assert.equal(elm.firstChild.innerHTML, 'Number is 1');
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patch(vnode1, vnode2);
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assert.equal(elm.firstChild.innerHTML, 'Number is 1');
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patch(vnode2, vnode3);
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assert.equal(elm.firstChild.innerHTML, 'Number is 2');
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assert.equal(called, 2);
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});
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});
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