1 files changed, 86 insertions, 0 deletions
diff --git a/format/pktline/encoder_buffered_flush_behavior_test.go b/format/pktline/encoder_buffered_flush_behavior_test.go
new file mode 100644
index 00000000..09bac9f9
--- /dev/null
+++ b/format/pktline/encoder_buffered_flush_behavior_test.go
@@ -0,0 +1,86 @@
+package pktline_test
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+	"codeberg.org/lindenii/furgit/format/pktline"
+)
+
+func TestEncoderBufferedFlushBehavior(t *testing.T) {
+	t.Parallel()
+
+	var out bytes.Buffer
+
+	bw := bufio.NewWriter(&out)
+	enc := pktline.NewEncoder(bw)
+
+	err := enc.WriteData([]byte("hello"))
+	if err != nil {
+		t.Fatalf("WriteData: %v", err)
+	}
+
+	err = enc.WriteFlush()
+	if err != nil {
+		t.Fatalf("WriteFlush: %v", err)
+	}
+
+	if out.Len() != 0 {
+		t.Fatalf("WriteFlush should not flush I/O, got %q", out.String())
+	}
+
+	err = enc.FlushIO()
+	if err != nil {
+		t.Fatalf("FlushIO: %v", err)
+	}
+
+	if got, want := out.String(), "0009hello0000"; got != want {
+		t.Fatalf("got %q, want %q", got, want)
+	}
+
+	out.Reset()
+	bw = bufio.NewWriter(&out)
+	enc = pktline.NewEncoder(bw)
+
+	err = enc.WriteData([]byte("ok"))
+	if err != nil {
+		t.Fatalf("WriteData: %v", err)
+	}
+
+	err = enc.WriteFlush()
+	if err != nil {
+		t.Fatalf("WriteFlush: %v", err)
+	}
+
+	if out.Len() != 0 {
+		t.Fatalf("WriteFlush should not flush I/O, got %q", out.String())
+	}
+
+	err = enc.FlushIO()
+	if err != nil {
+		t.Fatalf("FlushIO: %v", err)
+	}
+
+	if got, want := out.String(), "0006ok0000"; got != want {
+		t.Fatalf("got %q, want %q", got, want)
+	}
+
+	out.Reset()
+	bw = bufio.NewWriter(&out)
+	enc = pktline.NewEncoder(bw)
+
+	err = enc.WriteData([]byte("yo"))
+	if err != nil {
+		t.Fatalf("WriteData: %v", err)
+	}
+
+	err = enc.WriteFlushAndFlushIO()
+	if err != nil {
+		t.Fatalf("WriteFlushAndFlushIO: %v", err)
+	}
+
+	if got, want := out.String(), "0006yo0000"; got != want {
+		t.Fatalf("got %q, want %q", got, want)
+	}
+}
+