b = asList(4, 8, 15, 16, 23, 42);
    assertFalse(Iterators.elementsEqual(a.iterator(), b.iterator()));
    assertFalse(Iterators.elementsEqual(b.iterator(), a.iterator()));

    // Different lengths, one is empty.
    a = Collections.emptySet();
    b = asList(4, 8, 15, 16, 23, 42);
    assertFalse(Iterators.elementsEqual(a.iterator(), b.iterator()));
    assertFalse(Iterators.elementsEqual(b.iterator(), a.iterator()));
  }

    b = asList(4, 8, 15, 16, 23, 42);
    assertFalse(Iterators.elementsEqual(a.iterator(), b.iterator()));
    assertFalse(Iterators.elementsEqual(b.iterator(), a.iterator()));

    // Different lengths, one is empty.
    a = Collections.emptySet();
    b = asList(4, 8, 15, 16, 23, 42);
    assertFalse(Iterators.elementsEqual(a.iterator(), b.iterator()));
    assertFalse(Iterators.elementsEqual(b.iterator(), a.iterator()));
  }

    assertFalse(TypeToken.of(wildcardType).isSupertypeOf(wildcardType));
    assertFalse(TypeToken.of(int[].class).isSupertypeOf(wildcardType));
  }

  public void testAssignableWildcardTypeParameterToClassTypeParameter() {
    TypeToken<?> wildcardType = new TypeToken<Iterable<? extends Object[]>>() {};
    assertFalse(new TypeToken<Iterable<Object[]>>() {}.isSupertypeOf(wildcardType));

    assertFalse(TypeToken.of(wildcardType).isSupertypeOf(wildcardType));
    assertFalse(TypeToken.of(int[].class).isSupertypeOf(wildcardType));
  }

  public void testAssignableWildcardTypeParameterToClassTypeParameter() {
    TypeToken<?> wildcardType = new TypeToken<Iterable<? extends Object[]>>() {};
    assertFalse(new TypeToken<Iterable<Object[]>>() {}.isSupertypeOf(wildcardType));

    for (Set<Integer> subset : expected) {
      assertTrue(powerSet.contains(subset));
    }
    assertFalse(powerSet.contains(ImmutableSet.of(1, 2, 4)));
    assertFalse(powerSet.contains(Collections.<@Nullable Integer>singleton(null)));
    assertFalse(powerSet.contains(null));
    assertFalse(powerSet.contains((Object) "notASet"));
  }

  public void testPowerSetIteration_manual() {

    assertEquals("lubricants", entry.getValue());
    assertTrue(iter.hasNext());

    entry = iter.next();
    assertEquals("alpha", entry.getKey());
    assertEquals("betical", entry.getValue());
    assertFalse(iter.hasNext());
  }

  public void testLinkedHashMapGeneralizesTypes() {
    Map<String, Integer> original = new LinkedHashMap<>();
    original.put("a", 1);
    original.put("b", 2);

    assertEquals("lubricants", entry.getValue());
    assertTrue(iter.hasNext());

    entry = iter.next();
    assertEquals("alpha", entry.getKey());
    assertEquals("betical", entry.getValue());
    assertFalse(iter.hasNext());
  }

  public void testLinkedHashMapGeneralizesTypes() {
    Map<String, Integer> original = new LinkedHashMap<>();
    original.put("a", 1);
    original.put("b", 2);

        getFinishedSignal.countDown();
      }
    }.start();

    computationStarted.await();
    cache.invalidate(getKey);
    cache.invalidate(refreshKey);
    assertFalse(map.containsKey(getKey));
    assertFalse(map.containsKey(refreshKey));

    // let computation complete
    letGetFinishSignal.countDown();
    getFinishedSignal.await();
    checkNothingLogged();

        getFinishedSignal.countDown();
      }
    }.start();

    computationStarted.await();
    cache.invalidate(getKey);
    cache.invalidate(refreshKey);
    assertFalse(map.containsKey(getKey));
    assertFalse(map.containsKey(refreshKey));

    // let computation complete
    letGetFinishSignal.countDown();
    getFinishedSignal.await();
    checkNothingLogged();

import static org.hamcrest.Matchers.lessThan;
import static org.hamcrest.Matchers.startsWith;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;