tests: add tests for auto-start and dynamic port forwarding

Add test coverage for new vmemres features:

TestAutoStartDaemon:
- test_auto_start_on_first_command: Verify daemon auto-starts
- test_no_daemon_flag: Verify --no-daemon uses ephemeral mode
- test_vconfig_auto_daemon: Test auto-daemon config setting
- test_vconfig_idle_timeout: Test idle-timeout config setting

TestDynamicPortForwarding:
- test_dynamic_port_forward_run: Run -d -p adds forward dynamically
- test_port_forward_cleanup_on_stop: Forwards removed on stop
- test_port_forward_cleanup_on_rm: Forwards removed on rm
- test_multiple_dynamic_port_forwards: Multiple containers work

TestPortForwardRegistry:
- test_port_forward_cleared_on_memres_stop: Registry cleared

Also add ensure_busybox() helper to both VdkrRunner and VpdmnRunner.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/conftest.py b/tests/conftest.py
index b35f190c..71b86430 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -400,6 +400,13 @@ class VdkrRunner:
         if not self.has_image("alpine"):
             self.pull("alpine:latest", timeout=timeout)
 
+    def ensure_busybox(self, timeout=300):
+        """Ensure busybox:latest is available, pulling if necessary."""
+        # Ensure memres is running first (in case a previous test stopped it)
+        self.ensure_memres()
+        if not self.has_image("busybox"):
+            self.pull("busybox:latest", timeout=timeout)
+
 
 @pytest.fixture(scope="session")
 def vdkr(vdkr_bin, vdkr_env, arch, test_state_dir):
@@ -611,6 +618,13 @@ class VpdmnRunner:
         if not self.has_image("alpine"):
             self.pull("alpine:latest", timeout=timeout)
 
+    def ensure_busybox(self, timeout=300):
+        """Ensure busybox:latest is available, pulling if necessary."""
+        # Ensure memres is running first (in case a previous test stopped it)
+        self.ensure_memres()
+        if not self.has_image("busybox"):
+            self.pull("busybox:latest", timeout=timeout)
+
 
 @pytest.fixture(scope="session")
 def vpdmn(vpdmn_bin, vdkr_env, arch, vpdmn_test_state_dir):