add first markdown test and a notebook fixture for new notebook

notebook/tests/selenium/test_markdown.py

@@ -0,0 +1,37 @@
+import os
+
+import pytest
+from selenium.webdriver.common.keys import Keys
+
+from .utils import wait_for_selector, Notebook
+
+pjoin = os.path.join
+    
+
+@pytest.fixture(scope='module')
+def notebook(authenticated_browser):
+    b = authenticated_browser
+    new_button = b.find_element_by_id('new-buttons')
+    new_button.click()
+    kernel_selector = '#kernel-python3 a'
+    kernel_list = wait_for_selector(b, kernel_selector)
+    kernel_list[0].click()
+    window_handle_list = b.window_handles
+    window_handle_list.remove(b.current_window_handle)
+    b.switch_to_window(window_handle_list[0])
+    kernel_list = wait_for_selector(b, ".cell")
+    b.execute_script("Jupyter.notebook.set_autosave_interval(0)")
+    return Notebook(b)
+
+
+def test_markdown_cell(notebook):
+    nb = notebook
+    cell = nb.cells[0]
+    nb.convert_cell_type(cell_type="markdown")
+    assert nb.current_cell != cell
+    nb.edit_cell(index=0, content="# Foo")
+    nb.wait_for_stale_cell(cell)
+    rendered_cells = nb.browser.find_elements_by_class_name('text_cell_render')
+    outputs = [x.get_attribute('innerHTML') for x in rendered_cells]
+    expected = '<h1 id="Foo">Foo<a class="anchor-link" href="#Foo">¶</a></h1>'
+    assert outputs[0].strip() == expected