clh: add startSandbox unit test

- use utils.StartCmd to mock call to start hypervisor process.

- Add unit test for startSandbox.

Fixes: kata-containers#2367

Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>

virtcontainers/clh.go

@@ -754,7 +754,7 @@ func (clh *cloudHypervisor) LaunchClh() (string, int, error) {
 		cmd.Env = append(cmd.Env, "RUST_BACKTRACE=full")
 	}
 
-	if err := cmd.Start(); err != nil {
+	if err := utils.StartCmd(cmd); err != nil {
 		fmt.Println("Error starting cloudHypervisor", err)
 		if cmd.Process != nil {
 			cmd.Process.Kill()

virtcontainers/clh_test.go

@@ -230,3 +230,34 @@ func TestClhCreateSandbox(t *testing.T) {
 	assert.NoError(os.RemoveAll(parentDir))
 	assert.Exactly(clhConfig, clh.config)
 }
+
+func TestClooudHypervisorStartSandbox(t *testing.T) {
+	assert := assert.New(t)
+	clhConfig, err := newClhConfig()
+
+	clh := &cloudHypervisor{
+		config:    clhConfig,
+		APIClient: &clhClientMock{},
+		virtiofsd: &virtiofsdMock{},
+	}
+
+	sandbox := &Sandbox{
+		ctx: context.Background(),
+		id:  "testSandbox",
+		config: &SandboxConfig{
+			HypervisorConfig: clhConfig,
+		},
+	}
+
+	vcStore, err := store.NewVCSandboxStore(sandbox.ctx, sandbox.id)
+	assert.NoError(err)
+
+	sandbox.store = vcStore
+
+	// Create parent dir path for hypervisor.json
+	parentDir := store.SandboxConfigurationRootPath(sandbox.id)
+	assert.NoError(os.MkdirAll(parentDir, store.DirMode))
+
+	err = clh.startSandbox(10)
+	assert.NoError(err)
+}