diff --git a/hearthstone/__tests__/testUtils/promiseUtils.ts b/hearthstone/__tests__/testUtils/promiseUtils.ts
new file mode 100644
index 00000000..aea550bd
--- /dev/null
+++ b/hearthstone/__tests__/testUtils/promiseUtils.ts
@@ -0,0 +1,2 @@
+export const spyResolves = (returnValue: any) => jest.fn(() => Promise.resolve(returnValue));
+export const spyRejects = (error?: any) => jest.fn(() => Promise.reject(error));
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