Add model unit test for medication (#873)

- Add model unit test for medication

tests/unit/models/medication-test.js

@@ -0,0 +1,21 @@
+import { moduleForModel, test } from 'ember-qunit';
+
+moduleForModel('medication', 'Unit | Model | medication', {
+  needs: [
+    'model:inventory',
+    'model:patient',
+    'model:visit'
+  ]
+});
+
+test('isRequested', function(assert) {
+  let medication = this.subject({ status: 'Requested' });
+
+  assert.strictEqual(medication.get('isRequested'), true);
+});
+
+test('isRequested false', function(assert) {
+  let medication = this.subject({ status: 'Test' });
+
+  assert.strictEqual(medication.get('isRequested'), false);
+});