ADD test for image printing and text

* image printing does not check output
* text test checks output of a very basic string

setup.cfg

@@ -0,0 +1,3 @@
+[nosetests]
+verbosity=3
+with-doctest=1 

test/Dies ist ein Test.LF.txt

@@ -0,0 +1 @@
+Dies ist ein Test.

test/test_function_image.py

@@ -0,0 +1,38 @@
+#!/usr/bin/python
+"""tests for the image printing function
+
+:author: `Patrick Kanzler <patrick.kanzler@fablab.fau.de>`_
+:organization: `python-escpos <https://github.com/python-escpos>`_
+:copyright: Copyright (c) 2016 `python-escpos <https://github.com/python-escpos>`_
+:license: GNU GPL v3
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from nose.tools import with_setup
+
+import escpos.printer as printer
+import os
+
+devfile = 'testfile'
+
+def setup_testfile():
+    """create a testfile as devfile"""
+    fhandle = open(devfile, 'a')
+    try:
+        os.utime(devfile, None)
+    finally:
+        fhandle.close()
+
+def teardown_testfile():
+    """destroy testfile again"""
+    os.remove(devfile)
+
+@with_setup(setup_testfile, teardown_testfile)
+def test_function_image_with_50x50_png():
+    """test the image function with 50x50.png (grayscale png)"""
+    instance = printer.File(devfile=devfile)
+    instance.image("test/50x50.png")

test/test_function_text.py

@@ -0,0 +1,42 @@
+#!/usr/bin/python
+"""tests for the text printing function
+
+:author: `Patrick Kanzler <patrick.kanzler@fablab.fau.de>`_
+:organization: `python-escpos <https://github.com/python-escpos>`_
+:copyright: Copyright (c) 2016 `python-escpos <https://github.com/python-escpos>`_
+:license: GNU GPL v3
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+from nose.tools import with_setup
+
+import escpos.printer as printer
+import os
+
+import filecmp
+
+devfile = 'testfile'
+
+def setup_testfile():
+    """create a testfile as devfile"""
+    fhandle = open(devfile, 'a')
+    try:
+        os.utime(devfile, None)
+    finally:
+        fhandle.close()
+
+def teardown_testfile():
+    """destroy testfile again"""
+    os.remove(devfile)
+
+@with_setup(setup_testfile, teardown_testfile)
+def test_function_text_dies_ist_ein_test_lf():
+    """test the text printing function with simple string and compare output"""
+    instance = printer.File(devfile=devfile)
+    instance.text('Dies ist ein Test.\n')
+    instance.flush()
+    assert(filecmp.cmp('test/Dies ist ein Test.LF.txt', devfile))

test/test_load_module.py

@@ -7,6 +7,11 @@
 :license: GNU GPL v3
 """
 
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
 from nose.tools import with_setup
 
 import escpos.printer as printer