unclebob

public class Wrapper {
  public static String wrap(String s, int col) {
    if (s.length() <= col)
      return s;
    else {
      StringBuilder builder = new StringBuilder();
      String[] strings = s.split(" ");
      int column = 0;
      for (String segment : strings) {
        column += segment.length();

unclebob

    @Test
    public void wrapWellBeforeWordBoundary() throws Exception {
      assertThat(wrap("word word", 3), equalTo("wor\nd\nwor\nd"));
    }

unclebob

@RunWith(Suite.class)
@Suite.SuiteClasses({
  WrapperTest.DegenerateTests.class,
  WrapperTest.wrapWordsTest.class
})

public class WrapperTest {
  public static class DegenerateTests {
    @Test
    public void emptyString() throws Exception {

unclebob

    @Test
    public void wrapThreeWordsAfterSecondSpace() throws Exception {
      assertThat(wrap("word word word", 11), equalTo("word word\nword")); 
    }

unclebob

public class Wrapper {
  public static String wrap(String s, int col) {
    if (s.length() <= col)
      return s;
    else {
      int lastSpace = 0;
      int space;
      while ((space = s.indexOf(" ", lastSpace)) != -1) {
        if (space > col) {
          s = s.substring(0, lastSpace) + "\n" + s.substring(lastSpace+1);

unclebob

  public static class DegenerateTests {
    @Test
    public void wrap_EmptyString_ShouldBeEmpty() throws Exception {
      assertThat(wrap("", 1), equalTo(""));
    }

    @Test
    public void stringShorterThanColDoesNotWrap() throws Exception {
      assertThat(wrap("word", 10), equalTo("word"));
    }

unclebob

  public static class SplitWordTests {
    @Test
    public void splitOneWord() throws Exception {
      assertThat(wrap("word", 2), equalTo("wo\nrd"));
    }
  }

unclebob

    @Test
    public void splitOneWordManyTimes() throws Exception {
      assertThat(wrap("abcdefghij", 3), equalTo("abc\ndef\nghi\nj"));
    }

unclebob

public class Wrapper {
  public static String wrap(String s, int col) {
    if (s.length() <= col)
      return s;
    else
      return (s.substring(0, col) + "\n" + wrap(s.substring(col), col));
  }
}

unclebob

  public static class WrapTwoWords {
    @Test
    public void wrapOnWordBoundary() throws Exception {
      assertThat(wrap("word word", 5), equalTo("word\nword"));      
    }
  }