test: add retries to create glossary test (#923)

* test: add retries to create glossary test

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translate/snippets/src/test/java/com/example/translate/CreateGlossaryTests.java

@@ -19,6 +19,7 @@
 import static com.google.common.truth.Truth.assertThat;
 import static junit.framework.TestCase.assertNotNull;
 
+import com.google.cloud.testing.junit4.MultipleAttemptsRule;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
@@ -29,6 +30,7 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.BeforeClass;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -76,6 +78,8 @@ public void tearDown() throws InterruptedException, ExecutionException, IOExcept
     System.setOut(originalPrintStream);
   }
 
+  @Rule public MultipleAttemptsRule multipleAttemptsRule = new MultipleAttemptsRule(3);
+
   @Test
   public void testCreateGlossary() throws InterruptedException, ExecutionException, IOException {
     List<String> languageCodes = new ArrayList<>();