1 files changed, 39 insertions, 0 deletions
diff --git a/polygerrit-ui/app/services/scheduler/fake-scheduler.ts b/polygerrit-ui/app/services/scheduler/fake-scheduler.ts
new file mode 100644
index 0000000000..d4df3cea62
--- /dev/null
+++ b/polygerrit-ui/app/services/scheduler/fake-scheduler.ts
@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright 2022 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import {Scheduler, Task} from './scheduler';
+
+type FakeTask = (error?: unknown) => Promise<void>;
+export class FakeScheduler<T> implements Scheduler<T> {
+  readonly scheduled: Array<FakeTask> = [];
+
+  schedule(task: Task<T>) {
+    return new Promise<T>((resolve, reject) => {
+      this.scheduled.push(async (error?: unknown) => {
+        if (error) {
+          reject(error);
+        } else {
+          try {
+            resolve(await task());
+          } catch (e: unknown) {
+            reject(e);
+          }
+        }
+      });
+    });
+  }
+
+  async resolve(): Promise<void> {
+    if (this.scheduled.length === 0) return;
+    const fakeTask = this.scheduled.shift() as FakeTask;
+    await fakeTask();
+  }
+
+  async reject(error: unknown): Promise<void> {
+    if (this.scheduled.length === 0) return;
+    const fakeTask = this.scheduled.shift() as FakeTask;
+    await fakeTask(error);
+  }
+}