Call prerecord in test parallelization

This deviates from the vanilla minitest behaviour, which calls prerecord
before tests are run even for parallel executors, which can result in
interleaved output.

Instead this calls prerecord after the test has come back and
immediately before calling record while holding a mutex, to ensure the
correct time is associated with the correct test.

Co-authored-by: abeidahmed <[email protected]>

Author: jhawthorn

activesupport/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Print test names when running `rails test -v` for parallel tests.
+
+    *John Hawthorn*, *Abeid Ahmed*
+
 *   Deprecate `Benchmark.ms` core extension.
 
     The `benchmark` gem will become bundled in Ruby 3.5

activesupport/lib/active_support/testing/parallelization/server.rb

@@ -6,6 +6,8 @@
 module ActiveSupport
   module Testing
     class Parallelization # :nodoc:
+      PrerecordResultClass = Struct.new(:name)
+
       class Server
         include DRb::DRbUndumped
 
@@ -21,6 +23,7 @@ def record(reporter, result)
           @in_flight.delete([result.klass, result.name])
 
           reporter.synchronize do
+            reporter.prerecord(PrerecordResultClass.new(result.klass), result.name)
             reporter.record(result)
           end
         end