grpc-api/stub: Implementation for InternalTimeUtil under grpc-api module

Author: SreeramdasLavanya

api/src/main/java/io/grpc/InternalTimeUtils.java

@@ -20,7 +20,7 @@
 
 @Internal
 public final class InternalTimeUtils {
-  static long convert(Duration duration) {
+  public static long convert(Duration duration) {
     try {
       return duration.toNanos();
     } catch (ArithmeticException tooBig) {

stub/src/main/java/io/grpc/stub/AbstractStub.java

@@ -17,7 +17,7 @@
 package io.grpc.stub;
 
 import static com.google.common.base.Preconditions.checkNotNull;
-import static io.grpc.stub.InternalTimeUtils.convert;
+import static io.grpc.InternalTimeUtils.convert;
 
 import io.grpc.CallCredentials;
 import io.grpc.CallOptions;

stub/src/main/java/io/grpc/stub/InternalTimeUtils.java

@@ -16,12 +16,18 @@
 
 package io.grpc.stub;
 
+import static com.google.common.truth.Truth.assertAbout;
 import static com.google.common.truth.Truth.assertThat;
+import static io.grpc.testing.DeadlineSubject.deadline;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.concurrent.TimeUnit.MINUTES;
 
 import io.grpc.CallOptions;
 import io.grpc.Channel;
+import io.grpc.Deadline;
 import io.grpc.stub.AbstractStub.StubFactory;
 import io.grpc.stub.AbstractStubTest.NoopStub;
+import java.time.Duration;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -47,8 +53,22 @@ public NoopStub newStub(Channel channel, CallOptions callOptions) {
         .isNull();
   }
 
-  class NoopStub extends AbstractStub<NoopStub> {
+  @Test
+  public void testDuration() {
+    NoopStub stub = NoopStub.newStub(new StubFactory<NoopStub>() {
+      @Override
+      public NoopStub newStub(Channel channel, CallOptions callOptions) {
+        return create(channel, callOptions);
+      }
+    }, channel, CallOptions.DEFAULT);
+    NoopStub stubInstance = stub.withDeadlineAfter(Duration.ofMinutes(1L));
+    Deadline actual = stubInstance.getCallOptions().getDeadline();
+    Deadline expected = Deadline.after(1, MINUTES);
 
+    assertAbout(deadline()).that(actual).isWithin(10, MILLISECONDS).of(expected);
+  }
+
+  class NoopStub extends AbstractStub<NoopStub> {
     NoopStub(Channel channel, CallOptions options) {
       super(channel, options);
     }