test: add test for network metric

add test for metric interface

Signed-off-by: Ace-Tang <[email protected]>

containerd-shim-v2/metrics_test.go

@@ -0,0 +1,56 @@
+// Copyright (c) 2017 Intel Corporation
+// Copyright (c) 2018 HyperHQ Inc.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package containerdshim
+
+import (
+	"context"
+	"testing"
+
+	"github.com/containerd/cgroups"
+	"github.com/containerd/containerd/namespaces"
+	vc "github.com/kata-containers/runtime/virtcontainers"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStatNetworkMetric(t *testing.T) {
+
+	assert := assert.New(t)
+	var err error
+
+	mockNetwork := []*vc.NetworkStats{
+		{
+			Name:    "test-network",
+			RxBytes: 10,
+			TxBytes: 20,
+		},
+	}
+
+	expectedNetwork := []*cgroups.NetworkStat{
+		{
+			Name:    "test-network",
+			RxBytes: 10,
+			TxBytes: 20,
+		},
+	}
+
+	testingImpl.StatsContainerFunc = func(ctx context.Context, sandboxID, containerID string) (vc.ContainerStats, error) {
+		return vc.ContainerStats{
+			NetworkStats: mockNetwork,
+		}, nil
+	}
+
+	defer func() {
+		testingImpl.StatsContainerFunc = nil
+	}()
+
+	ctx := namespaces.WithNamespace(context.Background(), "UnitTest")
+	resp, err := testingImpl.StatsContainer(ctx, testSandboxID, testContainerID)
+	assert.NoError(err)
+
+	metrics := statsToMetrics(&resp)
+	assert.Equal(expectedNetwork, metrics.Network)
+}