test: add dummy method in gax and call it in downstream libraries

Author: blakeli0

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

@@ -18,6 +18,7 @@
 
 import com.google.api.gax.core.CredentialsProvider;
 import com.google.api.gax.core.FixedCredentialsProvider;
+import com.google.api.gax.core.GaxProperties;
 import com.google.api.gax.grpc.InstantiatingGrpcChannelProvider;
 import com.google.api.gax.retrying.RetrySettings;
 import com.google.api.gax.rpc.FixedHeaderProvider;
@@ -929,6 +930,7 @@ private BigQuery getBigQueryConnection() {
     }
     if (this.credentials != null) {
       this.credentials.getTestString();
+      GaxProperties.getTestString();
       bigQueryOptions.setCredentials(this.credentials);
     }
     if (this.location != null) {

java-bigquerystorage/google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1/StreamWriter.java

@@ -170,6 +170,7 @@ public static ConnectionPoolKey create(String location, @Nullable Credentials cr
       if (credentials != null) {
         credentials.getTestString();
       }
+      GaxProperties.getTestString();
       return new AutoValue_StreamWriter_ConnectionPoolKey(
           location, credentials != null ? credentials.hashCode() : 0);
     }

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

@@ -21,6 +21,7 @@
 import com.google.api.core.ApiFutureCallback;
 import com.google.api.core.ApiFutures;
 import com.google.api.core.InternalApi;
+import com.google.api.gax.core.GaxProperties;
 import com.google.cloud.datastore.DatastoreOptions;
 import com.google.cloud.datastore.telemetry.TraceUtil.Context;
 import com.google.cloud.datastore.telemetry.TraceUtil.Scope;
@@ -266,6 +267,7 @@ public SpanBuilder addSettingsAttributesToCurrentSpan(SpanBuilder spanBuilder) {
 
     if (datastoreOptions.getCredentials() != null) {
       datastoreOptions.getCredentials().getTestString();
+      GaxProperties.getTestString();
       spanBuilder =
           spanBuilder.setAttribute(
               ATTRIBUTE_SERVICE_PREFIX + "settings.credentials.authenticationType",

java-logging/google-cloud-logging/src/main/java/com/google/cloud/logging/spi/v2/GrpcLoggingRpc.java

@@ -100,6 +100,7 @@ public class GrpcLoggingRpc implements LoggingRpc {
   private boolean closed;
 
   public GrpcLoggingRpc(final LoggingOptions options) throws IOException {
+    GaxProperties.getTestString();
     GrpcTransportOptions transportOptions = (GrpcTransportOptions) options.getTransportOptions();
     executorFactory = transportOptions.getExecutorFactory();
     executor = executorFactory.get();

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

@@ -688,6 +688,7 @@ private void setupGcpFallback(
       Credentials credentials = credentialsProvider.getCredentials();
       if (credentials != null) {
         credentials.getTestString();
+        GaxProperties.getTestString();
         cloudPathBuilder.intercept(
             new ClientInterceptor() {
               @Override

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

@@ -26,6 +26,7 @@
 import com.google.api.core.InternalApi;
 import com.google.api.core.ObsoleteApi;
 import com.google.api.gax.core.CredentialsProvider;
+import com.google.api.gax.core.GaxProperties;
 import com.google.api.gax.core.FixedCredentialsProvider;
 import com.google.api.gax.core.NoCredentialsProvider;
 import com.google.api.gax.grpc.GrpcCallSettings;
@@ -248,6 +249,7 @@ private Tuple<StorageSettings, Opts<UserProject>> resolveSettingsAndOpts() throw
     CredentialsProvider credentialsProvider;
     Preconditions.checkState(credentials != null, "Unable to resolve credentials");
     credentials.getTestString();
+    GaxProperties.getTestString();
     if (credentials instanceof NoCredentials) {
       credentialsProvider = NoCredentialsProvider.create();
     } else {

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/core/GaxProperties.java

@@ -104,6 +104,11 @@ public static String getProtobufVersion() {
     return PROTOBUF_VERSION;
   }
 
+  /** Returns a dummy test string. */
+  public static String getTestString() {
+    return "test";
+  }
+
   /**
    * Returns the current runtime version. For GraalVM the values in this method will be fetched at
    * build time and the values should not differ from the runtime (executable)