Fix fixture dependencies

testinfra/modules/base.py

@@ -48,7 +48,7 @@ def check_output(cls, command, *args, **kwargs):
     @classmethod
     def as_fixture(cls):
         @pytest.fixture(scope="session")
-        def f():
+        def f(testinfra_backend):
             return cls
         f.__doc__ = cls.__doc__
         return f

testinfra/modules/command.py

@@ -32,7 +32,7 @@ def __repr__(self):
     @classmethod
     def as_fixture(cls):
         @pytest.fixture(scope="session")
-        def f():
+        def f(testinfra_backend):
             return Command()
         f.__doc__ = cls.__doc__
         return f

testinfra/modules/package.py

@@ -41,8 +41,8 @@ def __repr__(self):
     @classmethod
     def as_fixture(cls):
         @pytest.fixture(scope="session")
-        def f():
-            if cls.run_test("which apt-get").rc == 0:
+        def f(Command):
+            if Command.run_test("which apt-get").rc == 0:
                 return DebianPackage
             else:
                 raise NotImplementedError

testinfra/modules/systeminfo.py

@@ -94,7 +94,7 @@ def codename(self):
     @classmethod
     def as_fixture(cls):
         @pytest.fixture(scope="session")
-        def f():
+        def f(testinfra_backend):
             return SystemInfo()
         f.__doc__ = cls.__doc__
         return f

testinfra/plugin.py

@@ -30,8 +30,8 @@
 SystemInfo = modules.SystemInfo.as_fixture()
 
 
-@pytest.fixture(autouse=True, scope="session")
-def _testinfra_set_backend(pytestconfig, _testinfra_host):
+@pytest.fixture(scope="session")
+def testinfra_backend(pytestconfig, _testinfra_host):
     if _testinfra_host is not None:
         backend_type = pytestconfig.option.connection or "ssh"
         testinfra.set_backend(backend_type, _testinfra_host)