test: 💍 add start auth oidc test

addons/auth/tests/dummy/app/authenticators/oidc.js

@@ -0,0 +1,15 @@
+import OIDCAuthenticator from 'auth/authenticators/oidc';
+
+export default class ApplicationOIDCAuthenticator extends OIDCAuthenticator {
+  buildTokenValidationEndpointURL(id) {
+    return `/validate/${id}`;
+  }
+
+  buildStartAuthEndpointURL() {
+    return '/authenticate:start';
+  }
+
+  buildDeauthEndpointURL() {
+    return '/deauthenticate';
+  }
+}

addons/auth/tests/unit/authenticators/oidc-test.js

@@ -1,8 +1,36 @@
-import { module /*, test */ } from 'qunit';
+import { module, test } from 'qunit';
 import { setupTest } from 'ember-qunit';
+import { Response } from 'miragejs';
 import setupMirage from 'ember-cli-mirage/test-support/setup-mirage';
 
 module('Unit | Authenticator | OIDC', function (hooks) {
   setupTest(hooks);
   setupMirage(hooks);
+
+  test('`startAuthentication` initiates the authentication flow and returns the response', async function (assert) {
+    assert.expect(2);
+    const authenticator = this.owner.lookup('authenticator:oidc');
+    this.server.post(
+      authenticator.buildStartAuthEndpointURL(),
+      () => new Response(200, {}, { foo: 'bar' })
+    );
+    const response = await authenticator.startAuthentication();
+    assert.ok(true, 'authentication succeeded');
+    assert.deepEqual(response, { foo: 'bar' });
+  });
+
+  test('`startAuthentication` rejects/errors if API returns an error response', async function (assert) {
+    assert.expect(1);
+    const authenticator = this.owner.lookup('authenticator:oidc');
+    this.server.post(
+      authenticator.buildStartAuthEndpointURL(),
+      () => new Response(400)
+    );
+    // Because assert.throws doesn't work with async errors/promise rejections
+    try {
+      await authenticator.startAuthentication();
+    } catch (e) {
+      assert.ok(true);
+    }
+  });
 });