def METHOD_NAME(self):
    c = self.c
    rc = c.rstCommands
    # Create the *input* tree.
    root = c.rootPosition().insertAfter()
    root.h = fn = '@rst test.html'
    child = root.insertAsLastChild()
    child.h = 'section'
    # Insert the body texts.  Overindent to eliminate @verbatim sentinels.
    root.b = textwrap.dedent("""\
        @language rest
        #####
        Title
        #####
        This is test.html
    """)
    child.b = textwrap.dedent("""\
        @ This is a doc part
        it has two lines.
        @c
        This is the body of the section.
    """)
    # Define the expected output.
    expected = textwrap.dedent(f"""\
        .. rst3: filename: {fn}
        .. _http-node-marker-1:
        @language rest
        #####
        Title
        #####
        This is test.html
        .. _http-node-marker-2:
        section
        +++++++
        @ This is a doc part
        it has two lines.
        @c
        This is the body of the section.