Unit test logger

- adds test utils methods
- checks default log level
- sets log level via spec file
- checks messages printing depending on level

tests/test_buildozer.py

@@ -1,13 +1,59 @@
+import re
 import os
+import codecs
 import mock
 import unittest
 import buildozer as buildozer_module
 from buildozer import Buildozer
 from six import StringIO
+import tempfile
 
 
 class TestBuildozer(unittest.TestCase):
 
+    def setUp(self):
+        """
+        Creates a temporary spec file containing the content of the default.spec.
+        """
+        self.specfile = tempfile.NamedTemporaryFile(suffix='.spec', delete=False)
+        self.specfilename = self.specfile.name
+        default_spec = codecs.open(self.default_specfile_path(), encoding='utf-8')
+        self.specfile.write(default_spec.read().encode('utf-8'))
+        self.specfile.close()
+
+    def tearDown(self):
+        """
+        Deletes the temporary spec file.
+        """
+        os.unlink(self.specfile.name)
+
+    @staticmethod
+    def default_specfile_path():
+        return os.path.join(
+            os.path.dirname(buildozer_module.__file__),
+            'default.spec')
+
+    @staticmethod
+    def file_re_sub(filepath, pattern, replace):
+        """
+        Helper method for inplace file regex editing.
+        """
+        with open(filepath) as f:
+            file_content = f.read()
+        with open(filepath, 'w') as f:
+            file_content = re.sub(pattern, replace, file_content)
+            f.write(file_content)
+
+    @classmethod
+    def set_specfile_log_level(cls, specfilename, log_level):
+        """
+        Helper method for setting `log_level` in a given `specfilename`.
+        """
+        pattern = 'log_level = [0-9]'
+        replace = 'log_level = {}'.format(log_level)
+        cls.file_re_sub(specfilename, pattern, replace)
+        buildozer = Buildozer(specfilename)
+
     def test_buildozer_base(self):
         """
         Basic test making sure the Buildozer object can be instanciated.
@@ -21,10 +67,7 @@ class TestBuildozer(unittest.TestCase):
         """
         Initializes Buildozer object from existing spec file.
         """
-        specfilepath = os.path.join(
-            os.path.dirname(buildozer_module.__file__),
-            'default.spec')
-        buildozer = Buildozer(filename=specfilepath)
+        buildozer = Buildozer(filename=self.default_specfile_path())
         self.assertTrue(os.path.exists(buildozer.specfilename))
 
     def test_buildozer_help(self):
@@ -36,3 +79,45 @@ class TestBuildozer(unittest.TestCase):
         with mock.patch('sys.stdout', new_callable=StringIO) as mock_stdout:
             buildozer.usage()
         self.assertIn('Usage:', mock_stdout.getvalue())
+
+    def test_log_get_set(self):
+        """
+        Tests reading and setting log level from spec file.
+        """
+        # the default log level value is known
+        buildozer = Buildozer('does_not_exist.spec')
+        assert buildozer.log_level == 1
+        # sets log level to 2 on the spec file
+        self.set_specfile_log_level(self.specfile.name, 2)
+        buildozer = Buildozer(self.specfile.name)
+        assert buildozer.log_level == 2
+
+    def test_log_print(self):
+        """
+        Checks logger prints different info depending on log level.
+        """
+        # sets log level to 1 in the spec file
+        self.set_specfile_log_level(self.specfile.name, 1)
+        buildozer = Buildozer(self.specfile.name)
+        assert buildozer.log_level == 1
+        # at this level, debug messages shouldn't not be printed
+        with mock.patch('sys.stdout', new_callable=StringIO) as mock_stdout:
+            buildozer.debug('debug message')
+            buildozer.info('info message')
+            buildozer.error('error message')
+        # using `in` keyword rather than `==` because of bash color prefix/suffix
+        assert 'debug message' not in mock_stdout.getvalue()
+        assert 'info message' in mock_stdout.getvalue()
+        assert 'error message' in mock_stdout.getvalue()
+        # sets log level to 2 in the spec file
+        self.set_specfile_log_level(self.specfile.name, 2)
+        buildozer = Buildozer(self.specfile.name)
+        assert buildozer.log_level == 2
+        # at this level all message types should be printed
+        with mock.patch('sys.stdout', new_callable=StringIO) as mock_stdout:
+            buildozer.debug('debug message')
+            buildozer.info('info message')
+            buildozer.error('error message')
+        assert 'debug message' in mock_stdout.getvalue()
+        assert 'info message' in mock_stdout.getvalue()
+        assert 'error message' in mock_stdout.getvalue()