diff --git a/test/test_function_softbarcode.py b/test/test_function_softbarcode.py
index fc702d7..78ae5bc 100644
--- a/test/test_function_softbarcode.py
+++ b/test/test_function_softbarcode.py
@@ -1,6 +1,7 @@
 #!/usr/bin/python
 
 import escpos.printer as printer
+import barcode.errors
 import pytest
 
 
@@ -8,10 +9,15 @@ import pytest
 def instance():
     return printer.Dummy()
 
+def test_soft_barcode_ean8_invalid(instance):
+    """test with an invalid barcode"""
+    with pytest.raises(barcode.errors.BarcodeError):
+        instance.soft_barcode("ean8", "1234")
 
 def test_soft_barcode_ean8(instance):
-    instance.soft_barcode("ean8", "1234")
+    """test with a valid ean8 barcode"""
+    instance.soft_barcode("ean8", "1234567")
 
 
 def test_soft_barcode_ean8_nocenter(instance):
-    instance.soft_barcode("ean8", "1234", center=False)
+    instance.soft_barcode("ean8", "1234567", center=False)