}

  public void testToString() {
    assertThat(entry("foo", 1).toString()).isEqualTo("foo");
    assertThat(entry("bar", 2).toString()).isEqualTo("bar x 2");
  }

  public void testToStringNull() {
    assertThat(entry(NE, 1).toString()).isEqualTo("null");
    assertThat(entry(NE, 2).toString()).isEqualTo("null x 2");
  }

  public void testEquals() {
    assertEquals(control("foo", 1), entry("foo", 1));

  }

  public void testToString() {
    assertThat(entry("foo", 1).toString()).isEqualTo("foo");
    assertThat(entry("bar", 2).toString()).isEqualTo("bar x 2");
  }

  public void testToStringNull() {
    assertThat(entry(NE, 1).toString()).isEqualTo("null");
    assertThat(entry(NE, 2).toString()).isEqualTo("null x 2");
  }

  public void testEquals() {
    assertEquals(control("foo", 1), entry("foo", 1));

      K key, V value) {
    return singletonMap(key, value).entrySet().iterator().next();
  }

  public void testToString() {
    assertThat(entry("foo", 1).toString()).isEqualTo("foo=1");
  }

  public void testToStringNull() {
    assertThat(entry(NK, 1).toString()).isEqualTo("null=1");
    assertThat(entry("foo", NV).toString()).isEqualTo("foo=null");
    assertThat(entry(NK, NV).toString()).isEqualTo("null=null");
  }