[IMP] Improve test checking database exist

tests/cli_22_dumpdb_test.py

@@ -140,6 +140,20 @@ def test_cli_dumpdb_failure(mocker):
         expect_success=False,
     )
 
+    # With a non-existing database
+    cli_runner_invoke(
+        [
+            "--log-level=DEBUG",
+            "dumpdb",
+            "--database=database_test_cli___dumpdb_non_existing",
+            f"--database-path={database_path}",
+            f"--database-format={formats[0]}",
+            f"--filestore-path={filestore_path}",
+            f"--filestore-format={formats[1]}",
+        ],
+        expect_success=False,
+    )
+
     # Cleanup files
     if database_path.is_dir():
         shutil.rmtree(database_path)