create new_notebook classmethod creating/switching to new Notebook page

notebook/tests/selenium/test_markdown.py

@@ -10,18 +10,7 @@ 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)
+    return Notebook.new_notebook(authenticated_browser)
 
 
 def test_markdown_cell(notebook):

notebook/tests/selenium/utils.py

@@ -130,6 +130,15 @@ class Notebook:
         self.add_cell(index, cell_type="markdown")
         self.edit_cell(index=index, content=content, render=render)
 
+
+    @classmethod
+    def new_notebook(cls, browser, kernel_name='kernel-python3'):
+        # initial_window_handles = browser.window_handles
+        with new_window(browser, selector=".cell"):
+            select_kernel(browser, kernel_name=kernel_name)
+        browser.execute_script("Jupyter.notebook.set_autosave_interval(0)")
+        return cls(browser)
+
     
 def select_kernel(browser, kernel_name='kernel-python3'):
     """Clicks the "new" button and selects a kernel from the options.