Utils { public boolean isNotBlank(final CharSequence cs) { return !isBlank(cs); }  boolean isBlank(final CharSequence cs); boolean isNotBlank(final CharSequence cs); String trimToSize(String str, int maxStringLength); void sleep(int ms); void logIssue(String message, Throwable ex); String getApplicationName(Context context); String getVersionName(Context context); int getVersionCode(Context context); String getApplicationPackageName(Context context); @NonNull String getAndroidId(Context context); boolean isOnWifi(Context context);  }
@Test public void testIsNotBlank() { assertFalse(utils.isNotBlank("")); assertFalse(utils.isNotBlank(" ")); assertFalse(utils.isNotBlank(" ")); assertFalse(utils.isNotBlank(null)); assertFalse(utils.isNotBlank("\n")); assertTrue(utils.isNotBlank("test")); assertTrue(utils.isNotBlank(" test")); assertTrue(utils.isNotBlank(" test")); assertTrue(utils.isNotBlank("@")); assertTrue(utils.isNotBlank("~")); assertTrue(utils.isNotBlank("`")); assertTrue(utils.isNotBlank("\"")); }