Convention for tests proving initial values?

I'm wondering if there is a de facto convention or if we should establish an explicit one for testing of initial values.  How many elements of the host language do we need to test to 'prove' an initial value is what the spec states?  All elements to which the property applies, for completeness?  One?  Something in between?

Best wishes,

Melinda
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Melinda S. Grant
Melinda Grant Consulting
+1.541.582.3681
Melinda.Grant@hp.com<mailto:melinda.grant@hp.com>