node tests: Add whiny_get() helper.
node tests: Add whiny_get() helper.

punchagan/zulip,rht/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,andersk/zulip,rht/zulip,zulip/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,rht/zulip,hackerkid/zulip,kou/zulip,rht/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,kou/zulip,rht/zulip,punchagan/zulip,punchagan/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,hackerkid/zulip,punchagan/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip