feat: Add isCancelable attribute to session model

Closes: gs

addons/api/addon/models/session.js

@@ -1,7 +1,18 @@
 import GeneratedSessionModel from '../generated/models/session';
+import { computed } from '@ember/object';
 
 export default class SessionModel extends GeneratedSessionModel {
 
+  // =attributes
+
+  /**
+   * @type {boolean}
+   */
+  @computed('status')
+  get isCancelable() {
+    return this.status?.match(/(active)|(pending)/i);
+  }
+
   // =methods
 
   /**

addons/api/tests/unit/models/session-test.js

@@ -4,10 +4,26 @@ import { setupTest } from 'ember-qunit';
 module('Unit | Model | session', function(hooks) {
   setupTest(hooks);
 
-  // Replace this with your real tests.
   test('it exists', function(assert) {
     let store = this.owner.lookup('service:store');
     let model = store.createRecord('session', {});
     assert.ok(model);
+    assert.notOk(model.isCancelable);
+  });
+
+  test('it allows cancellation of an active session', function(assert) {
+    let store = this.owner.lookup('service:store');
+    let model = store.createRecord('session', {
+      status: 'active'
+    });
+    assert.ok(model.isCancelable);
+  });
+
+  test('it allows cancellation of a pending session', function(assert) {
+    let store = this.owner.lookup('service:store');
+    let model = store.createRecord('session', {
+      status: 'pending'
+    });
+    assert.ok(model.isCancelable);
   });
 });