Add GCU empty input test to verify functional usage and valid configDB

tests/generic_config_updater/test_empty_input.py

@@ -0,0 +1,41 @@
+import logging
+import pytest
+
+from tests.generic_config_updater.gu_utils import apply_patch, expect_op_success
+from tests.generic_config_updater.gu_utils import generate_tmpfile, delete_tmpfile
+from tests.generic_config_updater.gu_utils import create_checkpoint, delete_checkpoint, rollback_or_reload
+
+logger = logging.getLogger(__name__)
+
+@pytest.fixture(autouse=True)
+def setup_env(duthosts, rand_one_dut_hostname):
+    """
+    Setup/teardown fixture for empty input=
+
+    Args:
+        duthosts: list of DUTs.
+        rand_selected_dut: The fixture returns a randomly selected DuT.
+    """
+    duthost = duthosts[rand_one_dut_hostname]
+    create_checkpoint(duthost)
+
+    yield
+
+    try:
+        logger.info("Rolled back to original checkpoint")
+        rollback_or_reload(duthost)
+
+    finally:
+        delete_checkpoint(duthost)
+
+def test_tc1_empty_input(duthost):
+    json_patch = []
+
+    tmpfile = generate_tmpfile(duthost)
+    logger.info("tmpfile {}".format(tmpfile))
+
+    try:
+        output = apply_patch(duthost, json_data=json_patch, dest_file=tmpfile)
+        expect_op_success(duthost, output)
+    finally:
+        delete_tmpfile(duthost, tmpfile)

tests/kvmtest.sh

@@ -152,6 +152,7 @@ test_t0() {
       container_checker/test_container_checker.py \
       process_monitoring/test_critical_process_monitoring.py \
       system_health/test_system_status.py \
+      generic_config_updater/test_empty_input.py \
       generic_config_updater/test_aaa.py \
       generic_config_updater/test_bgpl.py \
       generic_config_updater/test_bgp_prefix.py \