node tests: Improve copy_data_attribute_value test.
node tests: Improve copy_data_attribute_value test.

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