hg: jdk/sandbox: flatmap-branch: add testing for default implementation

[julia.boes at oracle.com]

Changeset: 4659615d1689
Author:    jboes
Date:      2020-03-25 16:12 +0000
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/4659615d1689

flatmap-branch: add testing for default implementation

! src/java.base/share/classes/java/util/stream/Stream.java
! test/jdk/java/util/stream/test/org/openjdk/tests/java/util/stream/FlatPushOpTest.java