Improve testability `env`-service

ui/packages/consul-ui/app/services/env.js

@@ -12,3 +12,63 @@ export default class EnvService extends Service {
     return env(key);
   }
 }
+/**
+ * Stub class that can be used in testing when we want to test
+ * interactions with the EnvService. We can use `EnvStub.stubEnv` to setup
+ * an Env-Service that returns certain values we need to execute our tests.
+ *
+ * Example:
+ *
+ * ```js
+ * // some-test.js
+ * test('testing interaction with Env-service', async function(assert) {
+ *   this.owner.register('service:env', class Stub extends EnvStub {
+ * .   stubEnv = {
+ *       CONSUL_ACLS_ENABLED: true
+ *     }
+ *   })
+ * })
+ * ```
+ */
+export class EnvStub extends EnvService {
+  var(key) {
+    const { stubEnv } = this;
+
+    const stubbed = stubEnv[key];
+
+    if (stubbed) {
+      return stubbed;
+    } else {
+      return super.var(...arguments);
+    }
+  }
+}
+
+/**
+ * Helper function to allow stubbing out data that is accessed by the application
+ * based on the Env-service. You will need to call this before the env-service gets
+ * initialized because it overrides the env-service injection on the owner.
+ *
+ * Example:
+ *
+ * ```js
+ * test('test something env related', async function(assert) {
+ *   setupTestEnv(this.owner, {
+ *     CONSUL_ACLS_ENABLED: true
+ *   });
+ *
+ *   // ...
+ * })
+ * ```
+ *
+ * @param {*} owner - the owner of the test instance (usually `this.owner`)
+ * @param {*} stubEnv - an object that holds the stubbed env-data
+ */
+export function setupTestEnv(owner, stubEnv) {
+  owner.register(
+    'service:env',
+    class Stub extends EnvStub {
+      stubEnv = stubEnv;
+    }
+  );
+}