@Test
  public void testToByteArrayWithNull() {
    assertThatThrownBy(() -> IOUtils.toByteArray(null)).isInstanceOf(AssertionError.class)
        .hasMessage("The input stream to read bytes from cannot be null!");
  }
Gets a fully-qualified path anchored at root.
<p>

@param pathElements a String array containing the elements of the path.
@return a fully-qualified pathname as a String value.
geode-core/src/test/java/org/apache/geode/internal/util/IOUtilsJUnitTest.java