### Question:
StringUtil { public static String uncapitalize(String str) { return str.substring(0, 1).toLowerCase() + str.substring(1); }  static String capitalize(Element element); static String capitalize(String str); static String uncapitalize(String str); static String toClassCase(CharSequence str); static String repeat(int n, String toRepeat, String delimiter);  }### Answer:
@Test void uncapitalize_upperCaseLetter_lowerCasesFirstLetter() { assertThat(StringUtil.uncapitalize("String")).isEqualTo("string"); }
@Test void uncapitalize_lowerCaseLetter_returnsSameString() { assertThat(StringUtil.uncapitalize("string")).isEqualTo("string"); }