Don't treat debug messages as errors

testjson/execution.go

@@ -734,7 +734,7 @@ func readStderr(config ScanConfig, execution *Execution) error {
 		if err := config.Handler.Err(line); err != nil {
 			return fmt.Errorf("failed to handle stderr: %v", err)
 		}
-		if isGoModuleOutput(line) {
+		if isGoModuleOutput(line) || isGoDebugOutput(line) {
 			continue
 		}
 		if strings.HasPrefix(line, "warning:") {
@@ -765,6 +765,20 @@ func isGoModuleOutput(scannerText string) bool {
 	return false
 }
 
+func isGoDebugOutput(scannerText string) bool {
+	prefixes := []string{
+		"HASH",       // Printed when tests are running with `GODEBUG=gocachehash=1`.
+		"testcache:", // Printed when tests are running with `GODEBUG=gocachetest=1`.
+	}
+
+	for _, prefix := range prefixes {
+		if strings.HasPrefix(scannerText, prefix) {
+			return true
+		}
+	}
+	return false
+}
+
 func parseEvent(raw []byte) (TestEvent, error) {
 	// TODO: this seems to be a bug in the `go test -json` output
 	if bytes.HasPrefix(raw, []byte("FAIL")) {