Refactor unit tests using common py.test layout and fixtures

tests/utils.py

-"""
-Utilities for unit tests.
-"""
-
-
-from __future__ import unicode_literals
-
-from functools import wraps
-import os
-import shutil
-import tempfile
-
-from mutalyzer.config import settings
-from mutalyzer.redisclient import client as redis
-from mutalyzer import db
-
-
-class TestEnvironment(object):
-    """
-    Configure Mutalyzer for unit tests. All storage is transient and isolated.
-    """
-    def __init__(self, fixtures=None):
-        fixtures = fixtures or []
-
-        self.cache_dir = tempfile.mkdtemp()
-
-        log_handle, self.log_file = tempfile.mkstemp()
-        os.close(log_handle)
-
-        database_uri = os.getenv('MUTALYZER_TEST_DATABASE_URI', 'sqlite://')
-        redis_uri = os.getenv('MUTALYZER_TEST_REDIS_URI', None)
-
-        settings.configure({'DEBUG':        False,
-                            'TESTING':      True,
-                            'CACHE_DIR':    self.cache_dir,
-                            'REDIS_URI':    redis_uri,
-                            'DATABASE_URI': database_uri,
-                            'LOG_FILE':     self.log_file})
-
-        # Mutalyzer create tables automatically if we're using an SQLite
-        # in-memory database.
-        if database_uri != 'sqlite://':
-            db.Base.metadata.drop_all(db.session.get_bind())
-            db.Base.metadata.create_all(db.session.get_bind())
-
-        if redis_uri is not None:
-            redis.flushdb()
-
-        for fixture in fixtures:
-            fixture()
-
-    def destroy(self):
-        """
-        Destroy all storage defined in the current environment.
-        """
-        db.session.remove()
-
-        shutil.rmtree(self.cache_dir)
-        os.unlink(self.log_file)
-
-
-class MutalyzerTest(object):
-    """
-    Test class providing an isolated test environment for each test.
-    """
-    fixtures = ()
-
-    def setup(self):
-        self.environment = TestEnvironment(fixtures=self.fixtures)
-
-    def teardown(self):
-        self.environment.destroy()
-
-
-def fix(*fixtures):
-    """
-    Decorator for a unit test setting up the specified fixtures.
-    """
-    def decorator(f):
-        @wraps(f)
-        def fixed_f(*args, **kwargs):
-            for fixture in fixtures:
-                fixture()
-            return f(*args, **kwargs)
-        return fixed_f
-    return decorator