More mypy (#612)

* remove type comment where type is annotated
* move function tests
* remove six from tests
* add none annotations
* add more types
* change mock (so that mypy understands it)

test/test_functions/test_function_softbarcode.py

@@ -0,0 +1,26 @@
+#!/usr/bin/python
+
+import barcode.errors
+import pytest
+
+import escpos.printer as printer
+
+
+@pytest.fixture
+def instance():
+    return printer.Dummy()
+
+
+def test_soft_barcode_ean8_invalid(instance: printer.Dummy) -> None:
+    """test with an invalid barcode"""
+    with pytest.raises(barcode.errors.BarcodeError):
+        instance.barcode("1234", "ean8", force_software=True)
+
+
+def test_soft_barcode_ean8(instance: printer.Dummy) -> None:
+    """test with a valid ean8 barcode"""
+    instance.barcode("1234567", "ean8", force_software=True)
+
+
+def test_soft_barcode_ean8_nocenter(instance: printer.Dummy) -> None:
+    instance.barcode("1234567", "ean8", align_ct=False, force_software=True)