enhancement:

- Update testify error handling code
- Add sample serviceAccount.json inside testdata

receiver/googlecloudmonitoringreceiver/receiver_test.go

@@ -5,7 +5,6 @@ package googlecloudmonitoringreceiver
 
 import (
 	"context"
-	"fmt"
 	"net"
 	"os"
 	"testing"
@@ -105,7 +104,7 @@ func TestInitializeClient_Success(t *testing.T) {
 	ctx := context.Background()
 
 	// Set up fake credentials for testing
-	os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "./../googlecloudspannerreceiver/testdata/serviceAccount.json")
+	os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "./testdata/serviceAccount.json")
 	defer os.Unsetenv("GOOGLE_APPLICATION_CREDENTIALS")
 
 	logger := zap.NewNop()
@@ -185,14 +184,11 @@ func TestStart_Failure_NoClient(t *testing.T) {
 		},
 	}
 
-	receiver := newGoogleCloudMonitoringReceiver(cfg, logger)
 	// Don't initialize the client to test failure case
-
-	// Test the Start function
-	err := receiver.Start(ctx, nil)
-	errMsg := fmt.Errorf("%s", "failed to find default credentials: google: could not find default credentials. See https://cloud.google.com/docs/authentication/external/set-up-adc for more information")
-	assert.Error(t, err)
-	assert.Contains(t, err.Error(), errMsg.Error())
+	receiver := newGoogleCloudMonitoringReceiver(cfg, logger)
+	err := receiver.Start(ctx, nil)                // Test the Start function
+	assert.Error(t, err)                           // Assert error presence
+	assert.Contains(t, err.Error(), "credentials") // Assert error contains a specific substring
 }
 
 func TestStart_Failure_InvalidMetricDescriptor_ProjectNotFound(t *testing.T) {
@@ -222,9 +218,9 @@ func TestStart_Failure_InvalidMetricDescriptor_ProjectNotFound(t *testing.T) {
 
 	// Test the Start function
 	err = receiver.Start(ctx, nil)
-	errMsg := fmt.Errorf("%s", "failed to retrieve metric descriptors data: rpc error: code = NotFound desc = project not found")
 	assert.Error(t, err)
-	assert.Contains(t, err.Error(), errMsg.Error())
+	assert.Contains(t, err.Error(), "not found")
+	assert.Equal(t, status.Code(err), codes.NotFound)
 }
 
 func TestStart_Failure_InvalidMetricDescriptor_Unauthenticated_User(t *testing.T) {
@@ -252,9 +248,9 @@ func TestStart_Failure_InvalidMetricDescriptor_Unauthenticated_User(t *testing.T
 
 	// Test the Start function
 	err = receiver.Start(ctx, nil)
-	errMsg := fmt.Errorf("%s", "failed to retrieve metric descriptors data: rpc error: code = Unauthenticated desc = transport: per-RPC creds failed due to error: auth: cannot fetch token: 400")
 	assert.Error(t, err)
-	assert.Contains(t, err.Error(), errMsg.Error())
+	assert.Contains(t, err.Error(), "Unauthenticated")
+	assert.Equal(t, status.Code(err), codes.Unauthenticated)
 }
 
 func TestScrape_Success(t *testing.T) {
@@ -301,8 +297,6 @@ func TestScrape_Success(t *testing.T) {
 
 	// Execute Scrape
 	metrics, err := receiver.Scrape(ctx)
-
-	// Assert
 	assert.NoError(t, err)
 	assert.NotNil(t, metrics)
 }
@@ -342,8 +336,6 @@ func TestScrape_Failure_MetricDescriptorNotFound(t *testing.T) {
 
 	// Execute Scrape
 	metrics, err := receiver.Scrape(ctx)
-
-	// Assert
 	assert.NoError(t, err) // Should not return error as it just show logs warning
 	assert.NotNil(t, metrics)
 	assert.Equal(t, 0, metrics.ResourceMetrics().Len())
@@ -393,12 +385,10 @@ func TestScrape_Failure_InvalidProjectID_WithMaxInterval(t *testing.T) {
 
 	// Execute Scrape
 	metrics, err := receiver.Scrape(ctx)
-
-	// Assert
-	errMsg := fmt.Errorf("%s", "failed to retrieve time series data: rpc error: code = NotFound desc = project not found")
 	assert.Error(t, err)
 	assert.NotNil(t, metrics)
-	assert.Contains(t, err.Error(), errMsg.Error())
+	assert.Contains(t, err.Error(), "not found")
+	assert.Equal(t, status.Code(err), codes.NotFound)
 }
 
 func TestConvertGCPTimeSeriesToMetrics(t *testing.T) {
@@ -770,8 +760,6 @@ func TestScrape_WithDefaultCollectionInterval(t *testing.T) {
 
 	// Execute Scrape
 	metrics, err := receiver.Scrape(ctx)
-
-	// Assert
 	assert.NoError(t, err)
 	assert.NotNil(t, metrics)
 }

receiver/googlecloudmonitoringreceiver/testdata/serviceAccount.json

@@ -0,0 +1,12 @@
+{
+  "type": "service_account",
+  "project_id": "qwerty",
+  "private_key_id": "qwerty",
+  "private_key": "-----BEGIN PRIVATE KEY-----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\n4w0afAT+jEpv2LBZWNT2XYdK\n-----END PRIVATE KEY-----\n",
+  "client_email": "[email protected]",
+  "client_id": "123",
+  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+  "token_uri": "https://oauth2.googleapis.com/token",
+  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/qwerty%40qwerty.iam.gserviceaccount.com"
+}