diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index 7a25abc..8205e39 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -24,6 +24,11 @@ const timeRegex = /^\d{2}:\d{2}:\d{2}/
 describe('action', () => {
   beforeEach(() => {
     jest.clearAllMocks()
+    jest.spyOn(core, 'debug').mockImplementation()
+    jest.spyOn(core, 'error').mockImplementation()
+    jest.spyOn(core, 'getInput').mockImplementation()
+    jest.spyOn(core, 'setFailed').mockImplementation()
+    jest.spyOn(core, 'setOutput').mockImplementation()
   })
 
   it('sets the time output', async () => {