1 files changed, 44 insertions, 0 deletions
diff --git a/format/sideband64k/helpers_test.go b/format/sideband64k/helpers_test.go
new file mode 100644
index 00000000..c10e9e71
--- /dev/null
+++ b/format/sideband64k/helpers_test.go
@@ -0,0 +1,44 @@
+package sideband64k_test
+
+import (
+	"bytes"
+	"io"
+)
+
+type limitWriter struct {
+	buf         bytes.Buffer
+	maxPerWrite int
+	flushes     int
+	shortWrite  bool
+}
+
+func (w *limitWriter) Write(p []byte) (int, error) {
+	if w.shortWrite {
+		return 0, nil
+	}
+
+	if w.maxPerWrite > 0 && len(p) > w.maxPerWrite {
+		p = p[:w.maxPerWrite]
+	}
+
+	return w.buf.Write(p)
+}
+
+func (w *limitWriter) Flush() error {
+	w.flushes++
+	return nil
+}
+
+type byteReader struct {
+	data []byte
+}
+
+func (r *byteReader) Read(p []byte) (int, error) {
+	if len(r.data) == 0 {
+		return 0, io.EOF
+	}
+
+	p[0] = r.data[0]
+	r.data = r.data[1:]
+	return 1, nil
+}