test/java/util/stream/bootlib/java.base/java/util/stream/LambdaTestHelpers.java

*** 45,54 ****
--- 45,55 ----
  import java.util.function.ToIntFunction;
  import java.util.function.ToLongFunction;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertTrue;
+ import static org.testng.Assert.assertFalse;
  
  /**
   * LambdaTestHelpers -- assertion methods and useful objects for lambda test cases
   */
  public class LambdaTestHelpers {
*** 398,407 ****
--- 399,422 ----
  
      public static<T> void assertContentsUnordered(Iterator<T> actual, Iterator<T> expected) {
          assertEquals(toBoxedMultiset(actual), toBoxedMultiset(expected));
      }
  
+     public static<T> void assertContains(Optional<T> actual, Iterator<T> it) {
+         if (actual.isPresent()) {
+             T r = actual.get();
+             boolean contained = false;
+             while (!contained && it.hasNext()) {
+                 contained = Objects.equals(r, it.next());
+             }
+             assertTrue(contained);
+         }
+         else {
+             assertFalse(it.hasNext());
+         }
+     }
+ 
      public static void launderAssertion(Runnable r, Supplier<String> additionalInfo) {
          try {
              r.run();
          }
          catch (AssertionError ae) {