1 files changed, 25 insertions, 0 deletions
diff --git a/logutil/logutil_test.go b/logutil/logutil_test.go
new file mode 100644
index 0000000..29f8849
--- /dev/null
+++ b/logutil/logutil_test.go
@@ -0,0 +1,25 @@
+package logutil
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestWrite(t *testing.T) {
+	var sb strings.Builder
+	w := NewUniqueWriter(&sb)
+
+	w.Write([]byte("l1\n"))
+	w.Write([]byte("l1\n"))
+	w.Write([]byte("l2\n"))
+	w.Write([]byte("\n"))
+	w.Write([]byte("\n"))
+
+	want := "l1\n" +
+		"\033[1A\033[Kl1 [repeated 2 times]\n" +
+		"l2\n" +
+		"\n\033[1A\033[K[repeated 2 times]\n"
+	if got := sb.String(); got != want {
+		t.Errorf("got %q, want %q", got, want)
+	}
+}