add io_stream lua test

dev/tests/io_stream.lua

@@ -0,0 +1,34 @@
+local device = file.create_memory_device()
+file.write(device..":test.txt", "Hello\nWorld")
+file.write_bytes(device..":test.bin", Bytearray({20, 30, 100, 200, 255}))
+
+local stream = file.open(device..":test.txt", 'r')
+
+local line1 = stream:read_line()
+local line2 = stream:read_line()
+
+assert(line1 == "Hello")
+assert(line2 == "World")
+
+local stream2 = file.open(device..":test.bin", 'rb')
+local data = stream2:read(5)
+assert(data[1] == 20)
+assert(data[2] == 30)
+assert(data[3] == 100)
+assert(data[4] == 200)
+assert(data[5] == 255)
+
+local stream3 = file.open(device..":test.txt", 'r')
+assert(stream3:is_alive())
+stream3:close()
+assert(not stream3:is_alive())
+
+local stream4 = file.open(device..":test.txt", 'r')
+stream4:seek('b', 6)
+local line = stream4:read_line()
+assert(line == "World")
+
+local stream5 = file.open(device..":test.txt", 'r')
+stream5:seek('e', 0)
+local pos = stream5:tell()
+assert(pos == 11)