1 files changed, 46 insertions, 0 deletions
diff --git a/protocol/sideband64k/encoder_partial_write_test.go b/protocol/sideband64k/encoder_partial_write_test.go
new file mode 100644
index 00000000..3cec9324
--- /dev/null
+++ b/protocol/sideband64k/encoder_partial_write_test.go
@@ -0,0 +1,46 @@
+package sideband64k_test
+
+import (
+	"errors"
+	"io"
+	"testing"
+
+	"codeberg.org/lindenii/furgit/protocol/sideband64k"
+)
+
+func TestEncoderHandlesPartialWrites(t *testing.T) {
+	t.Parallel()
+
+	dst := &limitWriter{maxPerWrite: 2}
+	enc := sideband64k.NewEncoder(dst)
+
+	err := enc.WriteProgress([]byte("abc"))
+	if err != nil {
+		t.Fatalf("WriteProgress: %v", err)
+	}
+
+	err = enc.WriteFlushAndFlushIO()
+	if err != nil {
+		t.Fatalf("WriteFlushAndFlushIO: %v", err)
+	}
+
+	if got, want := dst.buf.String(), "0008\x02abc0000"; got != want {
+		t.Fatalf("got %q, want %q", got, want)
+	}
+
+	if dst.flushes != 1 {
+		t.Fatalf("flushes=%d, want 1", dst.flushes)
+	}
+}
+
+func TestEncoderReturnsShortWrite(t *testing.T) {
+	t.Parallel()
+
+	dst := &limitWriter{shortWrite: true}
+	enc := sideband64k.NewEncoder(dst)
+
+	err := enc.WriteData([]byte("x"))
+	if !errors.Is(err, io.ErrShortWrite) {
+		t.Fatalf("got err %v, want io.ErrShortWrite", err)
+	}
+}