### Question:
StringUtils { public static boolean isNotBlank(final CharSequence cs) { return !isBlank(cs); } private  StringUtils(); static boolean isBlank(final CharSequence cs); static boolean isNotBlank(final CharSequence cs); static String getMaskedString(String secret, int lastSymbolsCount); static String getMaskedString(String secret); static String defaultIfBlank(String value, String defaultValue);  }### Answer:
@Test void isNotBlank() { assertThat(StringUtils.isNotBlank(null), is(false)); assertThat(StringUtils.isNotBlank(""), is(false)); assertThat(StringUtils.isNotBlank(" "), is(false)); assertThat(StringUtils.isNotBlank("bob"), is(true)); assertThat(StringUtils.isNotBlank(" bob "), is(true)); }