@Test
public void testCapitalize_String() {

    assertEquals(null, capitalize(null));
    assertEquals("", capitalize(""));
    assertEquals("  ", capitalize("  "));
    assertEquals("I", capitalize("I"));
    assertEquals("I", capitalize("i"));
    assertEquals("I Am Here 123", capitalize("i am here 123"));
    assertEquals("I Am Here 123", capitalize("I Am Here 123"));
    assertEquals("I Am HERE 123", capitalize("i am HERE 123"));
    assertEquals("I AM HERE 123", capitalize("I AM HERE 123"));
}