i2p: Convert unit tests to pytest style

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/modules/i2p/tests/test_helpers.py

@@ -13,10 +13,14 @@
 #   You should have received a copy of the GNU Affero General Public License
 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
-import unittest
+"""
+Unit tests for helpers of I2P application.
+"""
 
 from pathlib import Path
 
+import pytest
+
 from plinth.modules.i2p.helpers import TunnelEditor
 
 DATA_DIR = Path(__file__).parent / 'data'
@@ -24,41 +28,48 @@ TUNNEL_CONF_PATH = DATA_DIR / 'i2ptunnel.config'
 TUNNEL_HTTP_NAME = 'I2P HTTP Proxy'
 
 
-class TunnelEditorTests(unittest.TestCase):
-
-    def setUp(self):
-        self.editor = TunnelEditor(str(TUNNEL_CONF_PATH))
-
-    def test_reading_conf(self):
-        self.editor.read_conf()
-        self.assertGreater(len(self.editor.lines), 1)
-
-    def test_setting_idx(self):
-        self.editor.read_conf()
-        self.assertIsNone(self.editor.idx)
-        self.editor.set_tunnel_idx(TUNNEL_HTTP_NAME)
-        self.assertEqual(self.editor.idx, 0)
-
-    def test_setting_tunnel_props(self):
-        self.editor.read_conf()
-        self.editor.set_tunnel_idx('I2P HTTP Proxy')
-        interface = '0.0.0.0'
-        self.editor.set_tunnel_prop('interface', interface)
-        self.assertEqual(self.editor['interface'], interface)
-
-    def test_getting_inexistent_props(self):
-        self.editor.read_conf()
-        self.editor.idx = 0
-        self.assertRaises(KeyError, self.editor.__getitem__, 'blabla')
-
-    def test_setting_new_props(self):
-        self.editor.read_conf()
-        self.editor.idx = 0
-        value = 'lol'
-        prop = 'blablabla'
-        self.editor[prop] = value
-        self.assertEqual(self.editor[prop], value)
+@pytest.fixture
+def editor():
+    """Setup editor for each test."""
+    return TunnelEditor(str(TUNNEL_CONF_PATH))
 
 
-if __name__ == '__main__':
-    unittest.main()
+def test_reading_conf(editor):
+    """Test reading configuration file."""
+    editor.read_conf()
+    assert len(editor.lines) > 1
+
+
+def test_setting_idx(editor):
+    """Test setting index for editing a tunnel."""
+    editor.read_conf()
+    assert editor.idx is None
+    editor.set_tunnel_idx(TUNNEL_HTTP_NAME)
+    assert editor.idx == 0
+
+
+def test_setting_tunnel_props(editor):
+    """Test setting a tunnel property."""
+    editor.read_conf()
+    editor.set_tunnel_idx('I2P HTTP Proxy')
+    interface = '0.0.0.0'
+    editor.set_tunnel_prop('interface', interface)
+    assert editor['interface'] == interface
+
+
+def test_getting_nonexistent_props(editor):
+    """Test getting nonexistent property."""
+    editor.read_conf()
+    editor.idx = 0
+    with pytest.raises(KeyError):
+        _ = editor['blabla']
+
+
+def test_setting_new_props(editor):
+    """Test setting new properties."""
+    editor.read_conf()
+    editor.idx = 0
+    value = 'lol'
+    prop = 'blablabla'
+    editor[prop] = value
+    assert editor[prop] == value