feat: add nopcloser

internal/testutil/nopcloser.go

@@ -0,0 +1,19 @@
+package testutil
+
+import (
+	"io"
+)
+
+// NopSeekCloser is an io.Reader that does nothing on Close, and
+// seeks to the beginning of the stream on Seek.
+// It is an extension of io.NopCloser that also implements io.Seeker.
+type readSeekerNopCloser struct {
+	io.ReadSeeker
+}
+
+// Close does nothing.
+func (readSeekerNopCloser) Close() error { return nil }
+
+func ReadSeekerNopCloser(r io.ReadSeeker) io.ReadSeekCloser {
+	return readSeekerNopCloser{r}
+}