diff --git a/Makefile b/Makefile
index aced825..4d9b045 100644
--- a/Makefile
+++ b/Makefile
@@ -116,3 +116,7 @@ $(LINTER): $(TOOLBINDIR)
 
 $(TOOLBINDIR):
 	mkdir -p $(TOOLBINDIR)
+
+.PHONY: check-git-diff
+check-git-diff:
+	@./tools/git_diff_check
\ No newline at end of file
diff --git a/playbooks/test-sip.yaml b/playbooks/test-sip.yaml
index 6c0fca6..09f4c47 100644
--- a/playbooks/test-sip.yaml
+++ b/playbooks/test-sip.yaml
@@ -59,6 +59,10 @@
       make:
         chdir: "{{ zuul.project.src_dir }}"
         target: test
+    - name: Check git diff
+      make:
+        chdir: "{{ zuul.project.src_dir }}"
+        target: check-git-diff
     - name: Build Docker image
       make:
         chdir: "{{ zuul.project.src_dir }}"
diff --git a/tools/git_diff_check b/tools/git_diff_check
new file mode 100755
index 0000000..e3738fe
--- /dev/null
+++ b/tools/git_diff_check
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+# Update git index
+git update-index -q --ignore-submodules --refresh
+
+# Evaluate git files for difference, if found print message and fail.
+git diff-files --quiet --ignore-submodules
+if [ $? -ne 0 ]
+then
+    echo "git diff found modified test cases, please run make test"
+    exit 1
+fi
+
+echo "no git diff detected, make target completed successfully"