fixup: allow bench with round count (easier testable)

Author: not-matthias

testing/testing/benchmark.go

@@ -227,6 +227,8 @@ func (b *B) runN(n int) {
 	b.previousN = n
 	b.previousDuration = b.duration
 
+	b.codspeedItersPerRound = append(b.codspeedItersPerRound, int64(n))
+
 	if b.loop.n > 0 && !b.loop.done && !b.failed {
 		b.Error("benchmark function returned without B.Loop() == false (break or return in loop?)")
 	}
@@ -280,7 +282,8 @@ var labelsOnce sync.Once
 // subbenchmarks. b must not have subbenchmarks.
 func (b *B) run() {
 	labelsOnce.Do(func() {
-		fmt.Fprintf(b.w, "Running with codspeed instrumentation\n")
+		fmt.Fprintf(b.w, "Running with CodSpeed instrumentation\n")
+
 		fmt.Fprintf(b.w, "goos: %s\n", runtime.GOOS)
 		fmt.Fprintf(b.w, "goarch: %s\n", runtime.GOARCH)
 		if b.importPath != "" {
@@ -375,7 +378,6 @@ func (b *B) launch() {
 
 			for range rounds {
 				b.runN(int(roundN))
-				b.codspeedItersPerRound = append(b.codspeedItersPerRound, int64(roundN))
 			}
 		}
 	}