### Question:
Equals { public static boolean isNullOrBlank(final String s) { return s == null || s.trim().isEmpty(); }  static boolean safeEquals(final Object obj1, final Object obj2); static boolean isNullOrBlank(final String s); static boolean safeTrimmedStringEquals(final String s1, final String s2);  }### Answer:
@Test public void shouldBeBlank_withNullOrWhitespaceString() { assertTrue(Equals.isNullOrBlank(null)); assertTrue(Equals.isNullOrBlank(" ")); assertTrue(Equals.isNullOrBlank("\t")); }
@Test public void shouldNotBeBlank_withString() { assertFalse(Equals.isNullOrBlank(Randoms.randomString(5))); }