tests/k8s: add setup common

Bring the setup_common() from CCv0 branch test's
integration/kubernetes/confidential/tests_common.sh. It should be used
to reduce boilerplates on the setup() of the tests.

Unlike the original code, this won't export the `test_start_time` variable
as it wouldn't be accurate to grab logs from the worker nodes due
date/time mismatch between the running tests machine and the worker
node. The function export the `node` variable which holds the name of
a random node which has kata installed. Apart from that, it exports the
`node_start_time` which capture the date/time when the test started,
relative to the `node`.

Tests that should inspect the logs can schedule pods/resources to the `node`
and use `node_start_time` as the value reference to grep the logs.

Fixes #7590
Co-authored-by: stevenhorsman <steven@uk.ibm.com>
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>

tests/integration/kubernetes/tests_common.sh

@@ -33,6 +33,23 @@ dragonball_limitations="https://github.com/kata-containers/kata-containers/issue
 # overwrite it.
 export KUBECONFIG="${KUBECONFIG:-$HOME/.kube/config}"
 
+# Common setup for tests.
+#
+# Global variables exported:
+#	$node	             - random picked node that has kata installed
+#	$node_start_date     - start date/time at the $node for the sake of
+#                          fetching logs
+#
+setup_common() {
+	node=$(get_one_kata_node)
+	[ -n "$node" ]
+	node_start_time=$(exec_host "$node" date +\"%Y-%m-%d %H:%M:%S\")
+	[ -n "$node_start_time" ]
+	export node node_start_time
+
+	k8s_delete_all_pods_if_any_exists || true
+}
+
 get_pod_config_dir() {
 	pod_config_dir="${BATS_TEST_DIRNAME}/runtimeclass_workloads_work"
 	info "k8s configured to use runtimeclass"