diff --git a/test/test_functions.py b/test/test_functions.py
index f35de54..22ee737 100644
--- a/test/test_functions.py
+++ b/test/test_functions.py
@@ -5,13 +5,13 @@ from escpos.printer import Dummy
 def test_line_spacing_code_gen():
     printer = Dummy()
     printer.line_spacing(10)
-    assert printer.output == '\x1b3\n'
+    assert printer.output == b'\x1b3\n'
 
 
 def test_line_spacing_rest():
     printer = Dummy()
     printer.line_spacing()
-    assert printer.output == '\x1b2'
+    assert printer.output == b'\x1b2'
 
 
 def test_line_spacing_error_handling():