1 files changed, 41 insertions, 0 deletions
diff --git a/v_windows/v/vlib/io/io_test.v b/v_windows/v/vlib/io/io_test.v
new file mode 100644
index 0000000..fca17c2
--- /dev/null
+++ b/v_windows/v/vlib/io/io_test.v
@@ -0,0 +1,41 @@
+import io
+
+struct Buf {
+pub:
+	bytes []byte
+mut:
+	i int
+}
+
+struct Writ {
+pub mut:
+	bytes []byte
+}
+
+fn (mut b Buf) read(mut buf []byte) ?int {
+	if !(b.i < b.bytes.len) {
+		return none
+	}
+	n := copy(buf, b.bytes[b.i..])
+	b.i += n
+	return n
+}
+
+fn (mut w Writ) write(buf []byte) ?int {
+	if buf.len <= 0 {
+		return none
+	}
+	w.bytes << buf
+	return buf.len
+}
+
+fn test_copy() {
+	src := Buf{
+		bytes: 'abcdefghij'.repeat(10).bytes()
+	}
+	mut dst := Writ{
+		bytes: []byte{}
+	}
+	io.cp(src, mut dst) or { assert false }
+	assert dst.bytes == src.bytes
+}