billing: Add node test for is_in_array.
billing: Add node test for is_in_array.

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