w2, f2 := makeOffsetWriter(name)
		defer f2.Close()
		Copy(w2, f)
		checkContent(name, f2)
	})

	// Copy -> WriteTo -> Write
	// Note: strings.Reader implements the io.WriterTo interface.
	name = "Write_Of_Copy_WriteTo"
	t.Run(name, func(t *testing.T) {
		w, f := makeOffsetWriter(name)
		defer f.Close()
		Copy(w, strings.NewReader(content))
		checkContent(name, f)
	})