Starting on azure monitor metrics integration with MSI auth

plugins/outputs/azuremonitor/azuremetadata_test.go

@@ -0,0 +1,44 @@
+package azuremonitor
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetMetadata(t *testing.T) {
+	azureMetadata := &AzureInstanceMetadata{}
+	metadata, err := azureMetadata.GetInstanceMetadata()
+
+	require.NoError(t, err)
+	require.NotNil(t, metadata)
+	require.NotEmpty(t, metadata.AzureResourceID)
+	require.NotEmpty(t, metadata.Compute.Location)
+
+	// if err != nil {
+	// 	t.Logf("could not get metadata: %v\n", err)
+	// } else {
+	// 	t.Logf("resource id  \n%s", metadata.AzureResourceID)
+	// 	t.Logf("metadata is \n%v", metadata)
+	// }
+
+	//fmt.Printf("metadata is \n%v", metadata)
+}
+
+func TestGetTOKEN(t *testing.T) {
+	azureMetadata := &AzureInstanceMetadata{}
+
+	resourceID := "https://ingestion.monitor.azure.com/"
+	token, err := azureMetadata.GetMsiToken("", resourceID)
+
+	require.NoError(t, err)
+	require.NotEmpty(t, token.AccessToken)
+	require.EqualValues(t, token.Resource, resourceID)
+
+	t.Logf("token is %+v\n", token)
+	t.Logf("expiry time is %s\n", token.ExpiresAt().Format(time.RFC3339))
+	t.Logf("expiry duration is %s\n", token.ExpiresInDuration().String())
+	t.Logf("resource is %s\n", token.Resource)
+
+}