The following information took me too long to discover, because it was not present in `doc/testing.md`. Note that the jtreg instructions are workable; it's just the gtest part that is lacking.

Please also consider adding links (somewhere) to jtreg and googletest downloads. I know jib.sh does this for some of us, but the instructions should not silently assume everyone is a jib user.

```
diff --git a/doc/testing.md b/doc/testing.md
index b8b4971cef8..2515004a033 100644
--- a/doc/testing.md
+++ b/doc/testing.md
@@ -167,6 +167,10 @@ use a fully qualified test descriptor, add `jtreg:`, e.g.
 
 ### Gtest
 
+To be able to run Google-style tests, `configure` may need help
+finding the googletest test framework. See `doc/building.md` for
+information.
+
 Since the Hotspot Gtest suite is so quick, the default is to run all tests.
 This is specified by just `gtest`, or as a fully qualified test descriptor
 `gtest:all`.
```