adding friendly asserting when you forget to needs a transform in uni…

…t test

addon/converter/fixture-converter.js

@@ -146,6 +146,15 @@ export default class {
       return this.defaultValueTransformFn;
     }
     let container = Ember.getOwner ? Ember.getOwner(this.store) : this.store.container;
+    let transform = container.lookup('transform:' + type);
+
+    Ember.assert(`[ember-data-factory-guy] could not find
+    the [ ${type} ] transform. If you are in a unit test, be sure 
+    to include it in the list of needs as [ transform:${type} ],  Or set your 
+    unit test to be [ integration: true ] and include everything.`,
+      transform
+    );
+
     return container.lookup('transform:' + type).serialize;
   }
 

tests/unit/router-test.js

@@ -0,0 +1,26 @@
+import {mockFindAll, mockSetup, mockTeardown, manualSetup} from 'ember-data-factory-guy';
+import {moduleFor, test} from 'ember-qunit';
+
+moduleFor('route:profiles', 'Unit | forgetting to needs transform', {
+  beforeEach() {
+    manualSetup(this.container);
+  },
+
+  afterEach() {
+    mockTeardown();
+  },
+
+  needs: [
+    'model:profile',
+//    'transform:just-a-string'  ( it's common to forget this needs )
+  ]
+});
+
+test('profiles', function(assert) {
+  let regex = new RegExp("\\[ember-data-factory-guy\\] could not find\\s*the \\[ just-a-string \\] transform");
+  assert.throws(
+    ()=>mockFindAll('profile', 2),
+    (err)=>{
+       return regex.test(err.toString());
+    });
+});