make sure progress writes to stdout

internal/app/app.go

@@ -34,7 +34,10 @@ type Options struct {
 
 	// Progress will print a single summary line for each package once the package has completed.
 	// Useful for long running test suites. Maybe used with FollowOutput or on its own.
-	Progress bool
+	//
+	// This will output to stdout.
+	Progress       bool
+	ProgressOutput io.Writer
 
 	// DisableTableOutput will disable all table output. This is used for testing.
 	DisableTableOutput bool
@@ -71,6 +74,7 @@ func Run(option Options) (int, error) {
 		parse.WithFollowVersboseOutput(option.FollowOutputVerbose),
 		parse.WithWriter(option.FollowOutputWriter),
 		parse.WithProgress(option.Progress),
+		parse.WithProgressOutput(option.ProgressOutput),
 	)
 	if err != nil {
 		return 1, err

main.go

@@ -159,11 +159,12 @@ func main() {
 			Trim:     *smallScreenPtr,
 			TrimPath: *trimPathPtr,
 		},
-		Format:      format,
-		Sorter:      sorter,
-		ShowNoTests: *showNoTestsPtr,
-		Progress:    *progressPtr,
-		Compare:     *comparePtr,
+		Format:         format,
+		Sorter:         sorter,
+		ShowNoTests:    *showNoTestsPtr,
+		Progress:       *progressPtr,
+		ProgressOutput: os.Stdout,
+		Compare:        *comparePtr,
 
 		// Do not expose publicly.
 		DisableTableOutput: false,

parse/process.go

@@ -109,7 +109,7 @@ func Process(r io.Reader, optionsFunc ...OptionsFunc) (*GoTestSummary, error) {
 		// Progress is a special case of follow, where we only print the
 		// progress of the test suite, but not the output.
 		if option.progress && option.w != nil {
-			printProgress(option.w, e, summary.Packages)
+			printProgress(option.progressOutput, e, summary.Packages)
 		}
 
 		summary.AddEvent(e)

parse/process_options.go

@@ -9,7 +9,9 @@ type options struct {
 	follow        bool
 	followVerbose bool
 	debug         bool
-	progress      bool
+
+	progress       bool
+	progressOutput io.Writer
 }
 
 type OptionsFunc func(o *options)
@@ -33,3 +35,7 @@ func WithDebug() OptionsFunc {
 func WithProgress(b bool) OptionsFunc {
 	return func(o *options) { o.progress = b }
 }
+
+func WithProgressOutput(w io.Writer) OptionsFunc {
+	return func(o *options) { o.progressOutput = w }
+}