add a smiple tests

Author: elinx

tests/smoke_test.py

@@ -0,0 +1,23 @@
+import subprocess
+import sys
+
+def main():
+    try:
+        # Run the installed script with --help
+        result = subprocess.run(["safe-view", "--help"], capture_output=True, text=True, check=True)
+        print("safe-view --help output:")
+        print(result.stdout)
+        if "usage: safe-view" not in result.stdout:
+            print("Error: 'usage: safe-view' not found in help output.")
+            sys.exit(1)
+        print("Smoke test passed!")
+    except FileNotFoundError:
+        print("Error: 'safe-view' command not found. Is the package installed correctly?")
+        sys.exit(1)
+    except subprocess.CalledProcessError as e:
+        print(f"Error running 'safe-view --help': {e}")
+        print(f"Stderr: {e.stderr}")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()