test: refactor idtoken test (#921)

- move them into the idtoken package
- use ADC var name as some tests require the fallback
- remove my locally sourced creds
- remove build tag restricting run

integration-tests/idtoken/idtoken_test.go → idtoken/integration_test.go

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build integration
-
-package idtoken
+package idtoken_test
 
 import (
 	"context"
@@ -20,7 +18,7 @@ import (
 )
 
 const (
-	envCredentialFile = "GCLOUD_TESTS_GOLANG_KEY"
+	envCredentialFile = "GOOGLE_APPLICATION_CREDENTIALS"
 
 	aud = "http://example.com"
 )
@@ -29,7 +27,6 @@ func TestNewTokenSource(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")
 	}
-	os.Setenv(envCredentialFile, "/Users/codyoss/creds/codyoss-workspace-2b1fb7cd40c0.json")
 	ts, err := idtoken.NewTokenSource(context.Background(), "http://example.com", option.WithCredentialsFile(os.Getenv(envCredentialFile)))
 	if err != nil {
 		t.Fatalf("unable to create TokenSource: %v", err)
@@ -56,7 +53,6 @@ func TestNewClient_WithCredentialFile(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test")
 	}
-	os.Setenv(envCredentialFile, "/Users/codyoss/creds/codyoss-workspace-2b1fb7cd40c0.json")
 	client, err := idtoken.NewClient(context.Background(), aud, option.WithCredentialsFile(os.Getenv(envCredentialFile)))
 	if err != nil {
 		t.Fatalf("unable to create Client: %v", err)

internal/kokoro/test.sh

@@ -7,7 +7,7 @@
 # Fail on any error
 set -eo pipefail
 
-export GCLOUD_TESTS_GOLANG_KEY="${KOKORO_GFILE_DIR}/secret_manager/go-cloud-integration-service-account"
+export GOOGLE_APPLICATION_CREDENTIALS="${KOKORO_GFILE_DIR}/secret_manager/go-cloud-integration-service-account"
 
 # Display commands being run
 set -x