### Question:
DocumentationParserSupport { public boolean isCommentStart(final String line) { if (line == null) { throw new IllegalArgumentException("Line cannot be null."); } return line.trim().startsWith("/**"); }  boolean isCommentClose(final String line); boolean isCommentStart(final String line); boolean isTagOpen(final String line); boolean isTerminatingTagOpen(final String line); String normalize(final String line); String stripCommentClose(final String line);  }### Answer:
@Test public void testIsCommentStart() { assertThat(support.isCommentStart(" ")).isFalse(); }
@Test public void testIsCommentStartNullLine() { IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> { support.isCommentStart(null); }); assertThat(e.getMessage()).isEqualTo("Line cannot be null."); }