* make it load its own version of FinalizableReferenceQueue. Then we need to interact with that
   * parallel version through reflection in order to exercise the parallel
   * FinalizableReferenceQueue, and then check that the parallel ClassLoader can be
   * garbage-collected after that.
   */

  public static class MyFinalizableWeakReference extends FinalizableWeakReference<Object> {

	_, err := fmt.Fprint(pipe, args[1])
	if err != nil {
		fmt.Fprintf(os.Stderr, "writing to pipe failed: %v\n", err)
		os.Exit(1)
	}
	pipe.Close()
}

func TestPipePassing(t *testing.T) {
	t.Parallel()

	r, w, err := os.Pipe()
	if err != nil {
		t.Error(err)
	}
	const marker = "arrakis, dune, desert planet"
	childProc := helperCommand(t, "pipehandle", strconv.FormatUint(uint64(w.Fd()), 16), marker)

		"issue20272.go",
		"issue27013.go",
		"issue30202.go",
	}

	testenv.MustHaveGoBuild(t)
	iters := 10
	if testing.Short() {
		iters = 4
	}
	t.Parallel()
	for _, test := range tests {
		test := test
		t.Run(test, func(t *testing.T) {
			t.Parallel()
			var want []byte
			tmp, err := os.CreateTemp("", "")
			if err != nil {
				t.Fatalf("temp file creation failed: %v", err)
			}
			defer os.Remove(tmp.Name())

    }

    def "can enable parallel execution via --parallel property"() {
        given:
        buildScript """
            task writeValue {
                doLast {
                    file("out.txt").text = gradle.startParameter.parallelProjectExecutionEnabled
                }
            }
        """

        when:
        runner("writeValue", "--parallel")

		t.Run(test.name, func(t *testing.T) {
			t.Parallel()
			f(t, curve)
		})
	}
}

func TestOnCurve(t *testing.T) {
	t.Parallel()
	testAllCurves(t, func(t *testing.T, curve Curve) {
		if !curve.IsOnCurve(curve.Params().Gx, curve.Params().Gy) {
			t.Error("basepoint is not on the curve")
		}
	})
}

func TestOffCurve(t *testing.T) {
	t.Parallel()
	testAllCurves(t, func(t *testing.T, curve Curve) {

            // ...
        }
}
```

Under the hood, this relies on Go's `t.Parallel()` and will, therefore, have the same behavior.

A parallel test will run in parallel with siblings that share the same parent test. The parent test function
will exit before the parallel children are executed. It should be noted that if the parent test is prevented

# Matches no subtests, parallel
go test -run Test/Sub/ThisWillNotMatch standalone_parallel_sub_test.go
stdout '^ok.*\[no tests to run\]'

-- standalone_parallel_sub_test.go --
package standalone_parallel_sub_test

import "testing"

func Test(t *testing.T) {
	ch := make(chan bool, 1)
	t.Run("Sub", func(t *testing.T) {
		t.Parallel()
		<-ch
		t.Run("Nested", func(t *testing.T) {})
	})

                        ${server.callFromBuild("parallel-task-done")}
                    }
                }
            """
        }
        def numWorkers = (parallelTaskCount / 2) + 2 as int

        when:
        server.expectConcurrent(numWorkers, ["parallel-task-done"] * parallelTaskCount + ["before-interrupt"] as String[])

# Matches only subtests, parallel
go test -run Test/Sub/Nested standalone_parallel_sub_test.go
! stdout '^ok.*\[no tests to run\]'
! stderr '^ok.*\[no tests to run\]'
stdout '^ok'

-- standalone_parallel_sub_test.go --
package standalone_parallel_sub_test

import "testing"

func Test(t *testing.T) {
	ch := make(chan bool, 1)
	t.Run("Sub", func(t *testing.T) {
		t.Parallel()
		<-ch
		t.Run("Nested", func(t *testing.T) {})
	})

		t.Errorf("expected zero waiting arena chunks, found %d", n)
	}
}

func runSubTestUserArenaNew[S comparable](t *testing.T, value *S, parallel bool) {
	t.Run(reflect.TypeOf(value).Elem().Name(), func(t *testing.T) {
		if parallel {
			t.Parallel()
		}

		// Allocate and write data, enough to exhaust the arena.
		//