mypy: Specify Callable parameters in FakeClient functions in WorkerTest.
mypy: Specify Callable parameters in FakeClient functions in WorkerTest.

timabbott/zulip,kou/zulip,tommyip/zulip,rishig/zulip,jackrzhang/zulip,eeshangarg/zulip,timabbott/zulip,dhcrzf/zulip,synicalsyntax/zulip,eeshangarg/zulip,rishig/zulip,showell/zulip,synicalsyntax/zulip,andersk/zulip,kou/zulip,brainwane/zulip,mahim97/zulip,brainwane/zulip,eeshangarg/zulip,andersk/zulip,rishig/zulip,zulip/zulip,jackrzhang/zulip,shubhamdhama/zulip,brainwane/zulip,kou/zulip,punchagan/zulip,timabbott/zulip,showell/zulip,rishig/zulip,synicalsyntax/zulip,showell/zulip,rht/zulip,zulip/zulip,jackrzhang/zulip,mahim97/zulip,synicalsyntax/zulip,rishig/zulip,kou/zulip,kou/zulip,kou/zulip,andersk/zulip,tommyip/zulip,hackerkid/zulip,timabbott/zulip,dhcrzf/zulip,synicalsyntax/zulip,jackrzhang/zulip,rht/zulip,zulip/zulip,zulip/zulip,andersk/zulip,dhcrzf/zulip,tommyip/zulip,rht/zulip,hackerkid/zulip,dhcrzf/zulip,showell/zulip,hackerkid/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,timabbott/zulip,shubhamdhama/zulip,andersk/zulip,jackrzhang/zulip,mahim97/zulip,mahim97/zulip,synicalsyntax/zulip,shubhamdhama/zulip,timabbott/zulip,tommyip/zulip,mahim97/zulip,showell/zulip,showell/zulip,synicalsyntax/zulip,punchagan/zulip,dhcrzf/zulip,jackrzhang/zulip,rishig/zulip,mahim97/zulip,brainwane/zulip,eeshangarg/zulip,brainwane/zulip,rht/zulip,punchagan/zulip,shubhamdhama/zulip,zulip/zulip,kou/zulip,dhcrzf/zulip,rht/zulip,punchagan/zulip,shubhamdhama/zulip,tommyip/zulip,punchagan/zulip,showell/zulip,eeshangarg/zulip,jackrzhang/zulip,brainwane/zulip,timabbott/zulip,rishig/zulip,hackerkid/zulip,hackerkid/zulip,dhcrzf/zulip,eeshangarg/zulip,tommyip/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,shubhamdhama/zulip,shubhamdhama/zulip,punchagan/zulip,brainwane/zulip,zulip/zulip,punchagan/zulip,tommyip/zulip