Add unit test for system verification

test/e2e_node/system/cgroup_validator_test.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package system
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidateCgroupSubsystem(t *testing.T) {
+	v := &CgroupsValidator{}
+	cgroupSpec := []string{"system1", "system2"}
+	for desc, test := range map[string]struct {
+		cgroupSpec []string
+		subsystems []string
+		err        bool
+	}{
+		"missing cgroup subsystem should report error": {
+			subsystems: []string{"system1"},
+			err:        true,
+		},
+		"extra cgroup subsystems should not report error": {
+			subsystems: []string{"system1", "system2", "system3"},
+			err:        false,
+		},
+		"subsystems the same with spec should not report error": {
+			subsystems: []string{"system1", "system2"},
+			err:        false,
+		},
+	} {
+		err := v.validateCgroupSubsystems(cgroupSpec, test.subsystems)
+		if !test.err {
+			assert.Nil(t, err, "%q: Expect error not to occur with cgroup", desc)
+		} else {
+			assert.NotNil(t, err, "%q: Expect error to occur with docker info", desc)
+		}
+
+	}
+}