improve type annotations in tests (#613)

test/test_abstract_base_class.py

@@ -14,14 +14,14 @@ import pytest
 import escpos.escpos as escpos
 
 
-def test_abstract_base_class_raises():
+def test_abstract_base_class_raises() -> None:
     """test whether the abstract base class raises an exception for ESC/POS"""
     with pytest.raises(TypeError):
         # This call should raise TypeError because of abstractmethod _raw()
-        escpos.Escpos()
+        escpos.Escpos()  # type: ignore [abstract]
 
 
-def test_abstract_base_class():
+def test_abstract_base_class() -> None:
     """test whether Escpos has the metaclass ABCMeta"""
     assert issubclass(escpos.Escpos, object)
     assert type(escpos.Escpos) is ABCMeta

test/test_load_module.py

@@ -11,7 +11,7 @@
 import escpos.printer as printer
 
 
-def test_instantiation():
+def test_instantiation() -> None:
     """test the instantiation of a escpos-printer class and basic printing"""
     instance = printer.Dummy()
     instance.text("This is a test\n")

test/test_load_module_missing_capability.py

@@ -13,7 +13,7 @@ import tempfile
 import pytest
 
 
-def test_instantiation():
+def test_instantiation() -> None:
     """test the instantiation of a escpos-printer class"""
     # inject an environment variable that points to an empty capabilities file
     os.environ["ESCPOS_CAPABILITIES_FILE"] = tempfile.NamedTemporaryFile().name

test/test_magicencode.py

@@ -13,6 +13,7 @@ import hypothesis.strategies as st
 import pytest
 from hypothesis import example, given
 
+from escpos import printer
 from escpos.exceptions import Error
 from escpos.katakana import encode_katakana
 from escpos.magicencode import Encoder, MagicEncode
@@ -54,7 +55,7 @@ class TestMagicEncode:
         Test initialization.
         """
 
-        def test_disabled_requires_encoding(self, driver):
+        def test_disabled_requires_encoding(self, driver: printer.Dummy) -> None:
             """
             Test that disabled without encoder raises an error.
 
@@ -64,33 +65,33 @@ class TestMagicEncode:
                 MagicEncode(driver, disabled=True)
 
     class TestWriteWithEncoding:
-        def test_init_from_none(self, driver):
+        def test_init_from_none(self, driver: printer.Dummy) -> None:
             encode = MagicEncode(driver, encoding=None)
             encode.write_with_encoding("CP858", "€ ist teuro.")
             assert driver.output == b"\x1bt\x13\xd5 ist teuro."
 
-        def test_change_from_another(self, driver):
+        def test_change_from_another(self, driver: printer.Dummy) -> None:
             encode = MagicEncode(driver, encoding="CP437")
             encode.write_with_encoding("CP858", "€ ist teuro.")
             assert driver.output == b"\x1bt\x13\xd5 ist teuro."
 
-        def test_no_change(self, driver):
+        def test_no_change(self, driver: printer.Dummy) -> None:
             encode = MagicEncode(driver, encoding="CP858")
             encode.write_with_encoding("CP858", "€ ist teuro.")
             assert driver.output == b"\xd5 ist teuro."
 
     class TestWrite:
-        def test_write(self, driver):
+        def test_write(self, driver: printer.Dummy) -> None:
             encode = MagicEncode(driver)
             encode.write("€ ist teuro.")
             assert driver.output == b"\x1bt\x0f\xa4 ist teuro."
 
-        def test_write_disabled(self, driver):
+        def test_write_disabled(self, driver: printer.Dummy) -> None:
             encode = MagicEncode(driver, encoding="CP437", disabled=True)
             encode.write("€ ist teuro.")
             assert driver.output == b"? ist teuro."
 
-        def test_write_no_codepage(self, driver):
+        def test_write_no_codepage(self, driver: printer.Dummy) -> None:
             encode = MagicEncode(
                 driver,
                 defaultsymbol="_",
@@ -101,7 +102,7 @@ class TestMagicEncode:
             assert driver.output == b"_ ist teuro."
 
     class TestForceEncoding:
-        def test(self, driver):
+        def test(self, driver: printer.Dummy) -> None:
             encode = MagicEncode(driver)
             encode.force_encoding("CP437")
             assert driver.output == b"\x1bt\x00"

test/test_raise_arbitrary_error.py

@@ -14,13 +14,13 @@ import escpos
 import escpos.exceptions
 
 
-def test_raise_error_wrongly():
+def test_raise_error_wrongly() -> None:
     """raise error the wrong way
 
     should reproduce https://github.com/python-escpos/python-escpos/issues/257
     """
     with pytest.raises(AttributeError):
-        raise escpos.Error("This should raise an AttributeError.")
+        raise escpos.Error("This should raise an AttributeError.")  # type: ignore [attr-defined]
 
 
 def tests_raise_error() -> None:

test/test_with_statement.py

@@ -12,7 +12,7 @@ import escpos.escpos as escpos
 import escpos.printer as printer
 
 
-def test_with_statement():
+def test_with_statement() -> None:
     """Use with statement
 
     .. todo:: Extend these tests as they don't really do anything at the moment"""