tests: Refactors PodSandbox creation

Most of the tests creating and using Pod Sandboxes in the same way. We can create
a common function that will do that for us, so we can have less duplicated code,
and make it easier to add new tests in the future.

Signed-off-by: Claudiu Belu <cbelu@cloudbasesolutions.com>

integration/imagefs_info_test.go

@@ -28,19 +28,12 @@ import (
 )
 
 func TestImageFSInfo(t *testing.T) {
-	config := PodSandboxConfig("running-pod", "imagefs")
+	t.Logf("Create a sandbox to make sure there is an active snapshot")
+	PodSandboxConfigWithCleanup(t, "running-pod", "imagefs")
 
 	t.Logf("Pull an image to make sure image fs is not empty")
 	EnsureImageExists(t, GetImage(BusyBox))
 
-	t.Logf("Create a sandbox to make sure there is an active snapshot")
-	sb, err := runtimeService.RunPodSandbox(config, *runtimeHandler)
-	require.NoError(t, err)
-	defer func() {
-		assert.NoError(t, runtimeService.StopPodSandbox(sb))
-		assert.NoError(t, runtimeService.RemovePodSandbox(sb))
-	}()
-
 	// It takes time to populate imagefs stats. Use eventually
 	// to check for a period of time.
 	t.Logf("Check imagefs info")
@@ -66,6 +59,6 @@ func TestImageFSInfo(t *testing.T) {
 	}, time.Second, 30*time.Second))
 
 	t.Logf("Image filesystem mountpath should exist")
-	_, err = os.Stat(info.GetFsId().GetMountpoint())
+	_, err := os.Stat(info.GetFsId().GetMountpoint())
 	assert.NoError(t, err)
 }