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Figure 20-10. Screenshot looking normal
Well, that didn’t help much.
A Common Selenium Problem: Race Conditions
Whenever you see an inexplicable failure in a Selenium test, one of the most likely
explanations is a hidden race condition. Let’s look at the line that failed:
functional_tests/test_my_lists.py.
# She sees that her list is in there, named according to its
# first list item
self
.
browser
.
find_element_by_link_text
(
'Reticulate splines'
)
.
click
()
self
.
assertEqual
(
self
.
browser
.
current_url
,
first_list_url
)
Immediately after we click the “Reticulate splines” link, we ask Selenium to check
whether the current URL matches the URL for our first list. But it doesn’t:
AssertionError:
'http://localhost:8081/accounts
/edith@example.com/' !=
'http://localhost:8081/lists/1/'
It looks like the current URL is still the URL of the “My Lists” page. What’s going on?
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Chapter 20: Continuous Integration (CI)