Improve dependecies tests

Mute output during tests.

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

HISTORY.rst

@@ -21,6 +21,7 @@
 - Update Pillow to version 6.2.1.
 - Move Celery and Django Celery dependencies
   to the task manager app.
+- Improve dependecies app tests.
 
 3.2.8 (2019-10-01)
 ==================

mayan/apps/dependencies/classes.py

@@ -403,7 +403,11 @@ class Dependency(object):
         ]
         """
         print(_('Patching files... '), end='')
-        sys.stdout.flush()
+
+        try:
+            sys.stdout.flush()
+        except AttributeError:
+            pass
 
         if not path:
             path = self.get_install_path()

mayan/apps/dependencies/tests/test_classes.py

@@ -4,6 +4,7 @@ from pathlib2 import Path
 import shutil
 
 from mayan.apps.common.tests import BaseTestCase
+from mayan.apps.common.tests.utils import mute_stdout
 from mayan.apps.storage.utils import mkdtemp
 
 from ..classes import Dependency, Provider
@@ -18,36 +19,48 @@ class TestDependency(Dependency):
 
 
 class DependencyClassTestCase(BaseTestCase):
-    def test_file_patching(self):
-        test_replace_text = 'replaced_text'
+    def setUp(self):
+        super(DependencyClassTestCase, self).setUp()
 
-        temporary_directory = mkdtemp()
-        path_temporary_directory = Path(temporary_directory)
-        path_test_file = path_temporary_directory / 'test_file.css'
+        self.test_replace_text = 'replaced_text'
 
-        with path_test_file.open(mode='w') as file_object:
+        self.temporary_directory = mkdtemp()
+        self.path_temporary_directory = Path(self.temporary_directory)
+        self.path_test_file = self.path_temporary_directory / 'test_file.css'
+
+        with self.path_test_file.open(mode='w') as file_object:
             file_object.write(
                 '@import url("https://fonts.googleapis.com/css?family=Lato:400,700,400italic");'
             )
+        self.test_dependency = TestDependency(
+            name='test_dependency', module=__name__
+        )
 
-        dependency = TestDependency(name='test_dependency', module=__name__)
+    def tearDown(self):
+        super(DependencyClassTestCase, self).tearDown()
+        shutil.rmtree(self.temporary_directory, ignore_errors=True)
+
+    def test_file_patching(self):
         replace_list = [
             {
                 'filename_pattern': '*',
                 'content_patterns': [
                     {
                         'search': '"https://fonts.googleapis.com/css?family=Lato:400,700,400italic"',
-                        'replace': test_replace_text,
+                        'replace': self.test_replace_text,
                     }
                 ]
             }
         ]
 
-        dependency.patch_files(path=temporary_directory, replace_list=replace_list)
+        with mute_stdout():
+            self.test_dependency.patch_files(
+                path=self.temporary_directory, replace_list=replace_list
+            )
 
-        with path_test_file.open(mode='r') as file_object:
+        with self.path_test_file.open(mode='r') as file_object:
             final_text = file_object.read()
 
-        shutil.rmtree(temporary_directory, ignore_errors=True)
-
-        self.assertEqual(final_text, '@import url({});'.format(test_replace_text))
+        self.assertEqual(
+            final_text, '@import url({});'.format(self.test_replace_text)
+        )