a litmus test

something that shows clearly what someone's opinions or intentions are

Usage notes: Litmus is a substance used in chemical tests because it changes colour.

His views on abortion are effectively a litmus test of his views on women's rights.

Name	Pronounced	Usage
Eloise	EL-o-eez, el-o-EEZ	English
Esteban	es-TE-bahn	Spanish
Daly	['deili]
Adkins	['ædkinz]
KoppÁNy	-	Hungarian
Chikelu	-	Western African, Igbo