@Test
public void headPathShouldReturnTheCorrectSubPath() {
TreePath path = new TreePath(new Object[] {"a", "b", "c"});
TreePath expected = path.getParentPath();
TreePath actual = TreePaths.headPath(path, path.getSegmentCount() - 1);
assertThat(actual, equalTo(expected));
}
@Test
public void headPathShouldThrowAnExceptionIfIndexIsNegative() {
TreePath path = newPath();
thrown.expect(IllegalArgumentException.class);
TreePaths.headPath(path, -1);
}
@Test
public void headPathShouldReturnAnEqualPathIfIndexIsEqualToThePathLength() {
TreePath path = newPath();
assertThat(TreePaths.headPath(path, path.getSegmentCount()), equalTo(path));
}
@Test
public void headPathShouldThrowAnExceptionIfIndexIsGreaterThanThePathLength() {
TreePath path = newPath();
thrown.expect(IllegalArgumentException.class);
TreePaths.headPath(path, path.getSegmentCount() + 1);
}
