Add a unit test for notYankedOrIsOwner (authored by @efx).

Author: smarnach

tests/unit/controllers/crate/version-test.js

@@ -0,0 +1,35 @@
+import { module, test } from 'qunit';
+import { setupTest } from 'ember-qunit';
+import { A } from '@ember/array';
+import Service from '@ember/service';
+
+module('Unit | Controller | crate/version', function(hooks) {
+    setupTest(hooks);
+    const userId = 1;
+    // stub the session service
+    // https://guides.emberjs.com/release/testing/testing-components/#toc_stubbing-services
+    const sessionStub = Service.extend();
+
+    hooks.beforeEach(function() {
+        sessionStub.currentUser = { id: userId };
+        this.owner.register('service:session', sessionStub);
+    });
+
+    test('notYankedOrIsOwner is true when conditions fulfilled', function(assert) {
+        assert.expect(2);
+        let controller = this.owner.lookup('controller:crate/version');
+        controller.model = { yanked: false };
+        controller.crate = { owner_user: A([{ id: userId }]) };
+        assert.ok(controller);
+        assert.ok(controller.notYankedOrIsOwner);
+    });
+
+    test('notYankedOrIsOwner is false when conditions fulfilled', function(assert) {
+        assert.expect(2);
+        let controller = this.owner.lookup('controller:crate/version');
+        controller.model = { yanked: true };
+        controller.crate = { owner_user: A([{ id: userId }]) };
+        assert.ok(controller);
+        assert.notOk(controller.notYankedOrIsOwner);
+    });
+});