Add tests for Astarte interface validation

- Add test to validate Astarte interfaces using astartectl

Signed-off-by: Jusuf <jusuf.avdic@secomind.com>

tests/utils/test_utils_interface.py

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: 2024 SECO Mind Srl
+#
+# SPDX-License-Identifier: Apache-2.0
+
+
+import subprocess
+import os
+
+
+def test_utils_interface_validate():
+    interface = "test.astarte-platform.draft.interfaces.Install"
+
+    interface_path = os.path.realpath(
+        os.path.join("tests", "realm_management", "test_interfaces", f"{interface}.json")
+    )
+
+    arg_list = [
+        "astartectl",
+        "utils",
+        "interfaces",
+        "validate",
+        interface_path,
+    ]
+
+    sample_data_result = subprocess.run(arg_list, capture_output=True, text=True)
+
+    assert sample_data_result.returncode == 0