diff --git a/.node-version b/.node-version
index 1cc433a..9d5712a 100644
--- a/.node-version
+++ b/.node-version
@@ -1 +1,2 @@
 20.6.0
+
diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index b9ce429..6785cdb 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -183,4 +183,27 @@ describe('main', () => {
       expect(outputs['predicate-type']).toBe('https://slsa.dev/provenance/v1')
     })
   })
+
+  describe('when an error occurs during processing', () => {
+    beforeEach(() => {
+      process.env = {
+        ...originalEnv,
+        GITHUB_SERVER_URL: 'https://github.com',
+        GITHUB_REPOSITORY: 'owner/repo'
+      }
+    })
+
+    it('fails the workflow run', async () => {
+      jest.spyOn(core, 'getInput').mockImplementation((name) => {
+        if (name === 'subject-images') {
+          throw new Error('Test error')
+        }
+        return ''
+      })
+
+      await main.run()
+
+      expect(setFailedMock).toHaveBeenCalledWith('Test error')
+    })
+  })
 })
diff --git a/src/main.ts b/src/main.ts
index 184cafe..0cd3d75 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -14,6 +14,8 @@ export async function run(): Promise<void> {
       for (const image of images) {
         core.info(`Processing image: ${image}`)
         // Add logic to process each image for attestation
+        // Assuming processImageForAttestation is a function that processes the image
+        await processImageForAttestation(image)
       }
     }
 
@@ -28,3 +30,13 @@ export async function run(): Promise<void> {
     core.setFailed(error.message)
   }
 }
+
+/**
+ * Processes an image for attestation.
+ * @param {string} image - The image to process.
+ * @returns {Promise<void>} Resolves when the image is processed.
+ */
+async function processImageForAttestation(image: string): Promise<void> {
+  // Add the actual logic to process the image for attestation
+  core.info(`Image ${image} processed for attestation`)
+}