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@Test
public void whenCollapseFromString_thenCollapsed() {
    String input = "       hel    lo      ";

    String result = CharMatcher.is(' ').collapseFrom(input, '-');
    assertEquals("-hel-lo-", result);

    result = CharMatcher.is(' ').trimAndCollapseFrom(input, '-');
    assertEquals("hel-lo", result);
}