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_text.py

@@ -0,0 +1,62 @@
+#!/usr/bin/python
+"""tests for the text printing function
+
+:author: `Patrick Kanzler <dev@pkanzler.de>`_
+:organization: `python-escpos <https://github.com/python-escpos>`_
+:copyright: Copyright (c) 2016 `python-escpos <https://github.com/python-escpos>`_
+:license: MIT
+"""
+
+
+import hypothesis.strategies as st
+import mock
+from hypothesis import given
+
+from escpos.printer import Dummy
+
+
+def get_printer() -> Dummy:
+    return Dummy(magic_encode_args={"disabled": True, "encoding": "CP437"})
+
+
+@given(text=st.text())
+def test_text(text: str):
+    """Test that text() calls the MagicEncode object."""
+    instance = get_printer()
+    with mock.patch.object(instance.magic, "write") as write:
+        instance.text(text)
+        write.assert_called_with(text)
+
+
+def test_block_text() -> None:
+    printer = get_printer()
+    printer.block_text(
+        "All the presidents men were eating falafel for breakfast.", font="a"
+    )
+    assert (
+        printer.output == b"All the presidents men were eating falafel\nfor breakfast."
+    )
+
+
+def test_textln() -> None:
+    printer = get_printer()
+    printer.textln("hello, world")
+    assert printer.output == b"hello, world\n"
+
+
+def test_textln_empty() -> None:
+    printer = get_printer()
+    printer.textln()
+    assert printer.output == b"\n"
+
+
+def test_ln() -> None:
+    printer = get_printer()
+    printer.ln()
+    assert printer.output == b"\n"
+
+
+def test_multiple_ln() -> None:
+    printer = get_printer()
+    printer.ln(3)
+    assert printer.output == b"\n\n\n"