1 files changed, 43 insertions, 0 deletions
diff --git a/internal/progress/meter_test.go b/internal/progress/meter_test.go
new file mode 100644
index 00000000..8fa09973
--- /dev/null
+++ b/internal/progress/meter_test.go
@@ -0,0 +1,43 @@
+package progress_test
+
+import (
+	"bytes"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"lindenii.org/go/furgit/internal/progress"
+	"lindenii.org/go/lgo/iowrap"
+)
+
+func TestMeterConcurrentAdd(t *testing.T) {
+	t.Parallel()
+
+	var buf bytes.Buffer
+
+	meter := progress.New(progress.Options{
+		Writer: iowrap.NopFlush(&buf),
+		Title:  "test",
+		Total:  1000,
+	})
+
+	var wg sync.WaitGroup
+
+	for range 10 {
+		wg.Go(func() {
+			for range 100 {
+				meter.Add(1, 0)
+				time.Sleep(time.Millisecond)
+			}
+		})
+	}
+
+	wg.Wait()
+
+	meter.Stop("done")
+
+	if got := buf.String(); !strings.Contains(got, "100% (1000/1000)") {
+		t.Fatalf("final line = %q, want it to contain %q", got, "100% (1000/1000)")
+	}
+}