Auto merge of #93 - vikram7:vr-add-classify, r=poteto

Add classify helper

The PR adds a `classify` helper per issue https://github.com/DockYard/ember-composable-helpers/issues/67

README.md

@@ -66,6 +66,7 @@ For action helpers, this will mean better currying semantics:
 * [String](#string-helpers)
   + [`camelize`](#camelize)
   + [`capitalize`](#capitalize)
+  + [`classify`](#classify)
   + [`dasherize`](#dasherize)
   + [`underscore`](#underscore)
   + [`w`](#w)
@@ -150,6 +151,16 @@ Capitalizes a string using `Ember.String.capitalize`.
 
 **[⬆️ back to top](#available-helpers)**
 
+#### `classify`
+Classifies a string using `Ember.String.classify`.
+
+```hbs
+{{classify "hello jim bob"}}
+{{classify stringWithDashes}}
+```
+
+**[⬆️ back to top](#available-helpers)**
+
 #### `dasherize`
 Capitalizes a string using `Ember.String.dasherize`.
 

addon/helpers/classify.js

@@ -0,0 +1,12 @@
+import Ember from 'ember';
+const {
+  Helper: { helper },
+  String: { classify: _classify }
+} = Ember;
+
+export function classify([string]) {
+  string = string || '';
+  return _classify(string);
+}
+
+export default helper(classify);

addon/index.js

@@ -1,6 +1,7 @@
 export { default as AppendHelper } from './helpers/append';
 export { default as CamelizeHelper } from './helpers/camelize';
 export { default as CapitalizeHelper } from './helpers/capitalize';
+export { default as ClassifyHelper } from './helpers/classify';
 export { default as CompactHelper } from './helpers/compact';
 export { default as ComputeHelper } from './helpers/compute';
 export { default as ContainsHelper } from './helpers/contains';

app/helpers/classify.js

@@ -0,0 +1 @@
+export { default, classify } from 'ember-composable-helpers/helpers/classify';

tests/integration/helpers/classify-test.js

@@ -0,0 +1,46 @@
+import { moduleForComponent, test } from 'ember-qunit';
+import hbs from 'htmlbars-inline-precompile';
+
+moduleForComponent('classify', 'Integration | Helper | {{classify}}', {
+  integration: true
+});
+
+test('It converts camelCase correctly', function(assert) {
+  this.render(hbs`{{classify "andAnother"}}`);
+
+  let expected = 'AndAnother';
+
+  assert.equal(this.$().text().trim(), expected, 'classifies camelCased strings');
+});
+
+test('It converts underscored strings correctly', function(assert) {
+  this.render(hbs`{{classify "harry_potter"}}`);
+
+  let expected = 'HarryPotter';
+
+  assert.equal(this.$().text().trim(), expected, 'classifies underscored strings');
+});
+
+test('It converts spaces in strings correctly', function(assert) {
+  this.render(hbs`{{classify "age is foolish and forgetful when it underestimates youth"}}`);
+
+  let expected = 'AgeIsFoolishAndForgetfulWhenItUnderestimatesYouth';
+
+  assert.equal(this.$().text().trim(), expected, 'classifies strings with spaces');
+});
+
+test('It correctly handles empty string input', function(assert) {
+  this.render(hbs`{{classify ""}}`);
+
+  let expected = '';
+
+  assert.equal(this.$().text().trim(), expected, 'renders empty string if input is empty string');
+});
+
+test('It correctly handles undefined input', function(assert) {
+  this.render(hbs`{{classify undefined}}`);
+
+  let expected = '';
+
+  assert.equal(this.$().text().trim(), expected, 'renders empty string if undefined input');
+});