diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 387fa6f5..cca24045 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -114,3 +114,60 @@ jobs:
 
       - name: Run Unit Tests
         run: python3 -m pytest
+
+  test-rocky:
+    name: "Rocky Linux: Python 3.9"
+    runs-on: ubuntu-latest
+    container:
+      image: rockylinux/rockylinux:9
+    steps:
+      - name: Checkout ReBench
+        uses: actions/checkout@v4
+
+      - name: Install basic tools
+        run: dnf install -y which time sudo python3-pip
+
+      - name: Run Tests and Package in venv
+        run: |
+            python3 -m pip install virtualenv
+            python3 -m virtualenv venv
+            source venv/bin/activate
+          
+            pip install pytest
+            pip install .
+    
+            pytest
+            (cd rebench && rebench -D ../rebench.conf e:TestRunner2)
+            
+            python3 setup.py sdist build
+            python3 setup.py sdist bdist_wheel
+
+      - name: Install built package globally
+        run: pip install dist/*.whl
+
+      - name: Run integration test
+        run: |
+            set +e
+            cd rebench
+            rebench -c ../rebench.conf e:TestRunner2
+            REBENCH_EXIT=$?
+          
+            echo "rebench exit code: $REBENCH_EXIT"
+          
+            if [ "$REBENCH_EXIT" -ne "0" ]; then
+              echo "rebench failed unexpectedly"
+              exit $REBENCH_EXIT
+            fi
+          
+            if [ ! -f test.data ]; then
+              echo "test.data not found"
+              exit 1
+            fi
+          
+            EXPECTED=80
+            LINES=$(cat test.data | grep total | wc -l)
+            if [ "$LINES" -ne "$EXPECTED" ]; then
+              echo "test.data has unexpected number of lines: $LINES"
+              echo "expected: $EXPECTED"
+              exit 1
+            fi
diff --git a/rebench/rebench.py b/rebench/rebench.py
index 8980ac31..967fdf87 100755
--- a/rebench/rebench.py
+++ b/rebench/rebench.py
@@ -323,24 +323,32 @@ def execute_experiment(self, runs, use_nice, use_shielding):
                                " using the reported settings.")
             return executor.execute()
 
+EXIT_CODE_SUCCESS = 0
+EXIT_CODE_BENCHMARK_FAILED = 1
+EXIT_CODE_ABORTED = 2
+EXIT_CODE_UI_ERROR = 3
+EXIT_CODE_EXCEPTION = 4
 
 def main_func():
     try:
         rebench = ReBench()
-        return 0 if rebench.run() else -1
+        if rebench.run():
+            return EXIT_CODE_SUCCESS
+        else:
+            return EXIT_CODE_BENCHMARK_FAILED
     except KeyboardInterrupt:
         ui = UI()
         ui.debug_error_info("Aborted by user request\n")
-        return -1
+        return EXIT_CODE_ABORTED
     except UIError as err:
         ui = UI()
         ui.error("\n" + err.message)
-        return -1
+        return EXIT_CODE_UI_ERROR
     except BenchmarkThreadExceptions as exceptions:
         ui = UI()
         for ex in exceptions.exceptions:
             ui.error(str(ex) + "\n")
-        return -1
+        return EXIT_CODE_EXCEPTION
 
 
 if __name__ == "__main__":
diff --git a/rebench/tests/denoise_test.py b/rebench/tests/denoise_test.py
index ffb222a7..c71978f2 100644
--- a/rebench/tests/denoise_test.py
+++ b/rebench/tests/denoise_test.py
@@ -12,7 +12,7 @@ def test_minimize(self):
         result = minimize_noise(False, self.ui, True)
         self.assertIsInstance(result.succeeded, bool)
         self.assertIsInstance(result.use_nice, bool)
-        self.assertIsInstance(result.use_shielding, bool)
+        self.assertIsInstance(result.use_shielding, (bool, str))
 
         # if it was successful, try to restore normal settings
         if result.succeeded:
diff --git a/rebench/tests/environment_test.py b/rebench/tests/environment_test.py
index 5ecc9513..fdc49a41 100644
--- a/rebench/tests/environment_test.py
+++ b/rebench/tests/environment_test.py
@@ -30,14 +30,17 @@ def test_environment(self):
         self.assertGreater(len(env["userName"]), 0)
         self.assertGreater(len(env["hostName"]), 0)
         self.assertGreater(len(env["osType"]), 0)
-        self.assertGreater(len(env["cpu"]), 0)
+
 
         self.assertTrue("manualRun" in env)
         self.assertGreater(env["memory"], 0)
-        self.assertGreaterEqual(env["clockSpeed"], 0)
 
         self.assertGreaterEqual(len(env["software"]), 3)
 
+        if "cpu" in env:
+            self.assertGreater(len(env["cpu"]), 0)
+            self.assertGreaterEqual(env["clockSpeed"], 0)
+
     def test_extract_base(self):
         self.assertEqual('', extract_base(''))
         self.assertEqual('branch', extract_base('branch'))