feat: fix bug with similar commit hashes. (#549)

* feat: improve error handling when similar commit hashed are detected.

* Updated triggered event

* Update debug message.

* Removed --no-merges restriction.

* Update to use qoutes.

* updated git fetch.

.github/workflows/test.yml

@@ -8,6 +8,9 @@ on:
   pull_request:
     branches:
       - main
+  pull_request_review:
+    types:
+      - submitted
 
 jobs:
   shellcheck:
@@ -116,6 +119,29 @@ jobs:
         shell:
           bash
 
+  test-similar-base-and-commit-sha:
+    name: Test changed-files similar base and commit sha
+    runs-on: ${{ matrix.platform }}
+    strategy:
+      fail-fast: false
+      max-parallel: 4
+      matrix:
+        platform: [ubuntu-latest, windows-latest, macos-latest, macos-11, ubuntu-18.04, windows-2022]
+
+    steps:
+      - name: Checkout to branch
+        uses: actions/checkout@v3
+
+      - name: Run changed-files with a single commit history
+        id: changed-files
+        uses: ./
+
+      - name: Show output
+        run: |
+          echo '${{ toJSON(steps.changed-files.outputs) }}'
+        shell:
+          bash
+
   test-non-existent-base-sha:
     name: Test changed-files non existent base sha
     runs-on: ${{ matrix.platform }}