How to use the lookatme.render.markdown_block function in lookatme

def test_table(mocker):
    """Test basic table rendering
    """
    import lookatme.widgets.table

    mocker.patch.object(lookatme.config, "LOG")
    fake_config = mocker.patch.object(lookatme.render.markdown_block, "config")
    mocker.patch.object(lookatme.widgets.table, "config", fake_config)
    fake_config.STYLE = {
        "table": {
            "column_spacing": 1,
            "header_divider": "-",
        },
    }

    rendered = render_markdown("""
| H1      |   H2   |     H3 |
|:--------|:------:|-------:|
| 1value1 | value2 | value3 |
| 1       | 2      | 3      |
""")

    assert len(rendered) == 4

def test_file_loader_relative(tmpdir, mocker):
    """Test the built-in file loader extension
    """
    mocker.patch.object(lookatme.config, "LOG")
    mocker.patch.object(lookatme.config, "SLIDE_SOURCE_DIR", str(tmpdir))
    fake_config = mocker.patch.object(lookatme.render.markdown_block, "config")
    mocker.patch.object(lookatme.render.pygments, "config", fake_config)
    fake_config.STYLE = TEST_STYLE

    tmppath = tmpdir.join("test.py")
    tmppath.write("print('hello')")

    rendered = render_markdown(f"""
```file
path: test.py
relative: true

""")

stripped_rows = [
    b'',
    b"print('hello')",

* ``urwid.Widget`` - A single widget to render. Will be added to
            ``stack[-1]`` automatically.
        """
        self._log.debug(f"Rendering slide {slide_num}")
        start = time.time()

        tmp_pile = urwid.Pile([])
        stack = [tmp_pile]
        for token in to_render.tokens:
            self._log.debug(f"{'  '*len(stack)}Rendering token {token}")

            last_stack = stack[-1]
            last_stack_len = len(stack)

            #render_token = getattr(lam_md, f"render_{token['type']}", lambda *args: None)
            render_token = getattr(lam_md, f"render_{token['type']}")
            res = render_token(token, stack[-1], stack, self.loop)
            if len(stack) > last_stack_len:
                self._propagate_meta(last_stack, stack[-1])
            if res is None:
                continue
            pile_add(last_stack, res)

        total = time.time() - start
        self._log.debug(f"Rendered slide {slide_num} in {total}")

        return tmp_pile.contents