test: call new auth method in bigquery, datastore, storage, and spanner

Author: blakeli0

java-bigquery/google-cloud-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryConnection.java

@@ -921,6 +921,7 @@ private BigQuery getBigQueryConnection() {
       bigQueryOptions.setProjectId(this.catalog);
     }
     if (this.credentials != null) {
+      this.credentials.getTestString();
       bigQueryOptions.setCredentials(this.credentials);
     }
     if (this.location != null) {

java-datastore/google-cloud-datastore/src/main/java/com/google/cloud/datastore/telemetry/EnabledTraceUtil.java

@@ -265,6 +265,7 @@ public SpanBuilder addSettingsAttributesToCurrentSpan(SpanBuilder spanBuilder) {
                 .build());
 
     if (datastoreOptions.getCredentials() != null) {
+      datastoreOptions.getCredentials().getTestString();
       spanBuilder =
           spanBuilder.setAttribute(
               ATTRIBUTE_SERVICE_PREFIX + "settings.credentials.authenticationType",

java-spanner/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java

@@ -668,6 +668,7 @@ private void setupGcpFallback(
     try {
       Credentials credentials = credentialsProvider.getCredentials();
       if (credentials != null) {
+        credentials.getTestString();
         cloudPathBuilder.intercept(
             new ClientInterceptor() {
               @Override

java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java

@@ -247,6 +247,7 @@ private Tuple<StorageSettings, Opts<UserProject>> resolveSettingsAndOpts() throw
     Opts<UserProject> defaultOpts = Opts.empty();
     CredentialsProvider credentialsProvider;
     Preconditions.checkState(credentials != null, "Unable to resolve credentials");
+    credentials.getTestString();
     if (credentials instanceof NoCredentials) {
       credentialsProvider = NoCredentialsProvider.create();
     } else {