selenium tests for metadata

[wmoore]

Webclient selenium test to check metadata for a particular image.

• Test needs to import an image with known metadata,
• Then check that the metadata page E.g. ​http://localhost:4080/webclient/metadata_details/image/4183/ displays correct data

• Aim to test for correct metadata in a way that is not too sensitive to changes in the UI layout - this will change as clients become unified

[Will Moore <will@…>]

(In [59ae6e278dcb77e05e33198c251eee313782d2e7/ome.git] on branch develop) First attempt at webclient metadata selenium tests. See #4219

[wmoore]

Problems so far:

• Don't know how to import a file as part of the test and retrieve it's ID. Looked at helper function in integration tests but not sure how this works in Selenium. For now, just hard coding an existing image ID.
• Identifying elements on a page with Selenium either uses very 'brittle' references E.g.

  self.assertEqual("DAPI", sel.get_value("//div[@id='metadata_tab']/div[4]/table/tbody/tr[1]/td[2]/input"))
  

• Alternative is to check that text exists somewhere on the page.

  self.failUnless(sel.is_text_present("DAPI"))
  

But this doesn't work for values in input fields (not sure how to test this).