Add tests for attributes module

test/attributes.js

@@ -0,0 +1,59 @@
+var assert = require('assert');
+
+var snabbdom = require('../snabbdom');
+var patch = snabbdom.init([
+  require('../modules/attributes'),
+]);
+var h = require('../h');
+
+describe('attributes', function() {
+  var elm, vnode0;
+  beforeEach(function() {
+    elm = document.createElement('div');
+    vnode0 = elm;
+  });
+  it('have their provided values', function() {
+    var vnode1 = h('div', {attrs: {href: '/foo', minlength: 1, value: true}});
+    elm = patch(vnode0, vnode1).elm;
+    assert.strictEqual(elm.getAttribute('href'), '/foo');
+    assert.strictEqual(elm.getAttribute('minlength'), '1');
+    assert.strictEqual(elm.getAttribute('value'), 'true');
+  });
+  it('are not omitted when falsy values are provided', function() {
+    var vnode1 = h('div', {attrs: {href: null, minlength: 0, value: false}});
+    elm = patch(vnode0, vnode1).elm;
+    assert.strictEqual(elm.getAttribute('href'), 'null');
+    assert.strictEqual(elm.getAttribute('minlength'), '0');
+    assert.strictEqual(elm.getAttribute('value'), 'false');
+  });
+  describe('boolean attribute', function() {
+    it('is present if the value is truthy', function() {
+      var vnode1 = h('div', {attrs: {required: true, readonly: 1, noresize: 'truthy'}});
+      elm = patch(vnode0, vnode1).elm;
+      assert.strictEqual(elm.getAttribute('required'), 'true');
+      assert.strictEqual(elm.getAttribute('readonly'), '1');
+      assert.strictEqual(elm.getAttribute('noresize'), 'truthy');
+    });
+    it('is omitted if the value is falsy', function() {
+      var vnode1 = h('div', {attrs: {required: false, readonly: 0, noresize: null}});
+      elm = patch(vnode0, vnode1).elm;
+      assert.strictEqual(elm.getAttribute('required'), null);
+      assert.strictEqual(elm.getAttribute('readonly'), null);
+      assert.strictEqual(elm.getAttribute('noresize'), null);
+    });
+  });
+  describe('Object.prototype property', function() {
+    it('is not considered as a boolean attribute and shouldn\'t be omitted', function() {
+      var vnode1 = h('div', {attrs: {valueOf: true, toString: 1, constructor: 'truthy'}});
+      elm = patch(vnode0, vnode1).elm;
+      assert.strictEqual(elm.getAttribute('valueOf'), 'true');
+      assert.strictEqual(elm.getAttribute('toString'), '1');
+      assert.strictEqual(elm.getAttribute('constructor'), 'truthy');
+      var vnode2 = h('div', {attrs: {valueOf: false, toString: 0, constructor: null}});
+      elm = patch(vnode0, vnode2).elm;
+      assert.strictEqual(elm.getAttribute('valueOf'), 'false');
+      assert.strictEqual(elm.getAttribute('toString'), '0');
+      assert.strictEqual(elm.getAttribute('constructor'), 'null');
+    })
+  });
+});

test/index.js

@@ -4,3 +4,4 @@ require('./dataset');
 require('./eventlisteners');
 require('./attachto');
 require('./thunk');
+require('./attributes');