tests: Fix bad use of mock local variable name.
tests: Fix bad use of mock local variable name.

This ended up masking the mock module.

kou/zulip,rishig/zulip,showell/zulip,kou/zulip,tommyip/zulip,timabbott/zulip,shubhamdhama/zulip,shubhamdhama/zulip,punchagan/zulip,showell/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,tommyip/zulip,shubhamdhama/zulip,rishig/zulip,punchagan/zulip,brainwane/zulip,tommyip/zulip,synicalsyntax/zulip,andersk/zulip,brainwane/zulip,brainwane/zulip,rishig/zulip,andersk/zulip,brainwane/zulip,kou/zulip,zulip/zulip,showell/zulip,rishig/zulip,eeshangarg/zulip,rht/zulip,showell/zulip,timabbott/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,rht/zulip,rht/zulip,synicalsyntax/zulip,zulip/zulip,timabbott/zulip,showell/zulip,synicalsyntax/zulip,eeshangarg/zulip,tommyip/zulip,eeshangarg/zulip,brainwane/zulip,synicalsyntax/zulip,hackerkid/zulip,zulip/zulip,hackerkid/zulip,punchagan/zulip,rishig/zulip,rishig/zulip,kou/zulip,hackerkid/zulip,kou/zulip,brainwane/zulip,kou/zulip,tommyip/zulip,zulip/zulip,synicalsyntax/zulip,andersk/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,synicalsyntax/zulip,timabbott/zulip,timabbott/zulip,synicalsyntax/zulip,punchagan/zulip,punchagan/zulip,shubhamdhama/zulip,tommyip/zulip,tommyip/zulip,hackerkid/zulip,shubhamdhama/zulip,showell/zulip,showell/zulip,zulip/zulip,punchagan/zulip,timabbott/zulip,andersk/zulip,eeshangarg/zulip,shubhamdhama/zulip,hackerkid/zulip,timabbott/zulip,kou/zulip,rishig/zulip,hackerkid/zulip,rht/zulip,shubhamdhama/zulip,brainwane/zulip