Use assertEqual as pluralized doesn't exist

[joestump]

Was working on getting my local dev environment working and ran into this.

[meeb]

Thanks! assertEquals did exist but seems it's been a depreciated alias since about 3.1 and removed in 3.6 or there about.

[joestump]

@meeb ah, that makes sense. Could have sworn it existed, but it’d been a bit since I’d written Python tests in the Django framework. 😅