Add fake clients and unit tests

pkg/cloudprovider/providers/azure/azure_util_test.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2017 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 azure
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetVmssInstanceID(t *testing.T) {
+	tests := []struct {
+		msg                string
+		machineName        string
+		expectError        bool
+		expectedInstanceID string
+	}{{
+		msg:         "invalid vmss instance name",
+		machineName: "vmvm",
+		expectError: true,
+	},
+		{
+			msg:                "valid vmss instance name",
+			machineName:        "vm00000Z",
+			expectError:        false,
+			expectedInstanceID: "35",
+		},
+	}
+
+	for i, test := range tests {
+		instanceID, err := getVmssInstanceID(test.machineName)
+		if test.expectError {
+			assert.Error(t, err, fmt.Sprintf("TestCase[%d]: %s", i, test.msg))
+		} else {
+			assert.Equal(t, test.expectedInstanceID, instanceID, fmt.Sprintf("TestCase[%d]: %s", i, test.msg))
+		}
+	}
+}