As described in JDK-8233954, the sunec.dll could be deleted in some circumstances and use the partial services of the SunEC provider.

It looks like there is no test case to cover this function.  As this is an important use case, it would be better to have test cases to check the operations when sunecc.ddl is not available.  I may suggest to add two kind of test cases, one for JCE test, one for JSSE test.