On Tue, 16 Feb 2021 23:49:36 GMT, Brian Burkhalter <b...@openjdk.org> wrote:

> I think the implementation changes here look good. I don't know however 
> whether there is enough coverage in the tests. These should verify that the 
> `Reader`, `CharArrayReader`, and `InputStreamReader` implementations of 
> `read(CharBuffer)` are accurate. If there is already sufficient coverage in 
> the tests in `test/jdk/java/io` then that is good enough and nothing need be 
> added.

`CharArrayReader` was lacking a test. I added a test which found a bug and 
fixed the bug. The PR also contains new tests for `Reader` and 
`InputStreamReader`. They cover on-heap and off-heap cases.

Is there a way to get test coverage with JTReg tests? I only found [1] which 
seems out of date and points to an Oracle internal wiki.

 [1] 
https://wiki.openjdk.java.net/display/CodeTools/JCov+FAQ#JCovFAQ-HowdoIuseJCovwithjtreg?

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PR: https://git.openjdk.java.net/jdk/pull/1915

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