Update acceptance test for image plugin.

cms/djangoapps/contentstore/features/html-editor.feature

@@ -22,6 +22,6 @@ Feature: CMS.HTML Editor
 
   Scenario: TinyMCE image plugin sets urls correctly
     Given I have created a Blank HTML Page
-    When I edit the page and select the Visual Editor
+    When I edit the page
     And I add an image with a static link via the Image Plugin Icon
     Then the image static link is rewritten to translate the path
\ No newline at end of file

cms/djangoapps/contentstore/features/html-editor.py

@@ -31,37 +31,26 @@ def i_created_etext_in_latex(step):
     )
 
 
-@step('I edit the page and select the Visual Editor')
+@step('I edit the page$')
 def i_click_on_edit_icon(step):
     world.edit_component()
-    world.wait_for(lambda _driver: world.css_visible('a.visual-tab'))
-    world.css_click('a.visual-tab')
 
 
-@step('I add an image with a static link via the Image Plugin Icon')
+@step('I add an image with a static link via the Image Plugin Icon$')
 def i_click_on_image_plugin_icon(step):
     # Click on image plugin button
-    world.wait_for(lambda _driver: world.css_visible('a.mce_image'))
-    world.css_click('a.mce_image')
+    world.css_click('.mce-i-image')
 
-    # Change to the non-modal TinyMCE Image window
-    # keeping parent window so we can go back to it.
-    parent_window = world.browser.current_window
-    for window in world.browser.windows:
+    # Wait for the editing window to open.
+    world.wait_for_visible('.mce-window')
 
-        world.browser.switch_to_window(window)  # Switch to a different window
-        if world.browser.title == 'Insert/Edit Image':
+    # Fill in the first field (source).
+    world.css_fill('.mce-textbox', '/static/image.jpg', 0)
+    # Click OK
+    world.css_click('.mce-primary')
 
-            # This is the Image window so find the url text box,
-            # enter text in it then hit Insert button.
-            url_elem = world.browser.find_by_id("src")
-            url_elem.fill('/static/image.jpg')
-            world.browser.find_by_id('insert').click()
 
-    world.browser.switch_to_window(parent_window)  # Switch back to the main window
-
-
-@step('the image static link is rewritten to translate the path')
+@step('the image static link is rewritten to translate the path$')
 def image_static_link_is_rewritten(step):
     # Find the TinyMCE iframe within the main window
     with world.browser.get_iframe('mce_0_ifr') as tinymce: