Add unit tests for pkg azure/auth

Signed-off-by: Shu0t1an Cheng <shuche@microsoft.com>

staging/src/k8s.io/legacy-cloud-providers/azure/auth/BUILD

@@ -1,4 +1,10 @@
-load("@io_bazel_rules_go//go:def.bzl", "go_library")
+package(default_visibility = ["//visibility:public"])
+
+load(
+    "@io_bazel_rules_go//go:def.bzl",
+    "go_library",
+    "go_test",
+)
 
 go_library(
     name = "go_default_library",
@@ -14,6 +20,17 @@ go_library(
     ],
 )
 
+go_test(
+    name = "go_default_test",
+    srcs = ["azure_auth_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//vendor/github.com/Azure/go-autorest/autorest/adal:go_default_library",
+        "//vendor/github.com/Azure/go-autorest/autorest/azure:go_default_library",
+        "//vendor/github.com/stretchr/testify/assert:go_default_library",
+    ],
+)
+
 filegroup(
     name = "package-srcs",
     srcs = glob(["**"]),

staging/src/k8s.io/legacy-cloud-providers/azure/auth/azure_auth_test.go

@@ -0,0 +1,152 @@
+/*
+Copyright 2019 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 auth
+
+import (
+	"testing"
+
+	"github.com/Azure/go-autorest/autorest/adal"
+	"github.com/Azure/go-autorest/autorest/azure"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetServicePrincipalTokenFromMSIWithUserAssignedID(t *testing.T) {
+	configs := []*AzureAuthConfig{
+		{
+			UseManagedIdentityExtension: true,
+			UserAssignedIdentityID:      "UserAssignedIdentityID",
+		},
+		// The Azure service principal is ignored when
+		// UseManagedIdentityExtension is set to true
+		{
+			UseManagedIdentityExtension: true,
+			UserAssignedIdentityID:      "UserAssignedIdentityID",
+			TenantID:                    "TenantID",
+			AADClientID:                 "AADClientID",
+			AADClientSecret:             "AADClientSecret",
+		},
+	}
+	env := &azure.PublicCloud
+
+	for _, config := range configs {
+		token, err := GetServicePrincipalToken(config, env)
+		assert.NoError(t, err)
+
+		msiEndpoint, err := adal.GetMSIVMEndpoint()
+		assert.NoError(t, err)
+
+		spt, err := adal.NewServicePrincipalTokenFromMSIWithUserAssignedID(msiEndpoint,
+			env.ServiceManagementEndpoint, config.UserAssignedIdentityID)
+		assert.NoError(t, err)
+		assert.Equal(t, token, spt)
+	}
+}
+
+func TestGetServicePrincipalTokenFromMSI(t *testing.T) {
+	configs := []*AzureAuthConfig{
+		{
+			UseManagedIdentityExtension: true,
+		},
+		// The Azure service principal is ignored when
+		// UseManagedIdentityExtension is set to true
+		{
+			UseManagedIdentityExtension: true,
+			TenantID:                    "TenantID",
+			AADClientID:                 "AADClientID",
+			AADClientSecret:             "AADClientSecret",
+		},
+	}
+	env := &azure.PublicCloud
+
+	for _, config := range configs {
+		token, err := GetServicePrincipalToken(config, env)
+		assert.NoError(t, err)
+
+		msiEndpoint, err := adal.GetMSIVMEndpoint()
+		assert.NoError(t, err)
+
+		spt, err := adal.NewServicePrincipalTokenFromMSI(msiEndpoint, env.ServiceManagementEndpoint)
+		assert.NoError(t, err)
+		assert.Equal(t, token, spt)
+	}
+
+}
+
+func TestGetServicePrincipalToken(t *testing.T) {
+	config := &AzureAuthConfig{
+		TenantID:        "TenantID",
+		AADClientID:     "AADClientID",
+		AADClientSecret: "AADClientSecret",
+	}
+	env := &azure.PublicCloud
+
+	token, err := GetServicePrincipalToken(config, env)
+	assert.NoError(t, err)
+
+	oauthConfig, err := adal.NewOAuthConfigWithAPIVersion(env.ActiveDirectoryEndpoint, config.TenantID, nil)
+	assert.NoError(t, err)
+
+	spt, err := adal.NewServicePrincipalToken(*oauthConfig, config.AADClientID, config.AADClientSecret, env.ServiceManagementEndpoint)
+	assert.NoError(t, err)
+
+	assert.Equal(t, token, spt)
+}
+
+func TestParseAzureEngironment(t *testing.T) {
+	cases := []struct {
+		cloudName               string
+		resourceManagerEndpoint string
+		identitySystem          string
+		expected                *azure.Environment
+	}{
+		{
+			cloudName:               "",
+			resourceManagerEndpoint: "",
+			identitySystem:          "",
+			expected:                &azure.PublicCloud,
+		},
+		{
+			cloudName:               "AZURECHINACLOUD",
+			resourceManagerEndpoint: "",
+			identitySystem:          "",
+			expected:                &azure.ChinaCloud,
+		},
+	}
+
+	for _, c := range cases {
+		env, err := ParseAzureEnvironment(c.cloudName, c.resourceManagerEndpoint, c.identitySystem)
+		assert.NoError(t, err)
+		assert.Equal(t, env, c.expected)
+	}
+}
+
+func TestAzureStackOverrides(t *testing.T) {
+	env := &azure.PublicCloud
+	resourceManagerEndpoint := "https://management.test.com/"
+
+	azureStackOverrides(env, resourceManagerEndpoint, "")
+	assert.Equal(t, env.ManagementPortalURL, "https://portal.test.com/")
+	assert.Equal(t, env.ServiceManagementEndpoint, env.TokenAudience)
+	assert.Equal(t, env.ResourceManagerVMDNSSuffix, "cloudapp.test.com")
+	assert.Equal(t, env.ActiveDirectoryEndpoint, "https://login.microsoftonline.com/")
+
+	azureStackOverrides(env, resourceManagerEndpoint, "adfs")
+	assert.Equal(t, env.ManagementPortalURL, "https://portal.test.com/")
+	assert.Equal(t, env.ServiceManagementEndpoint, env.TokenAudience)
+	assert.Equal(t, env.ResourceManagerVMDNSSuffix, "cloudapp.test.com")
+	assert.Equal(t, env.ActiveDirectoryEndpoint, "https://login.microsoftonline.com")
+}