test: abandon default DEBUG log level in tests

Now simple `py.test` command won't use DEBUG log level and `py.test ...
--log-level=LEVEL` will do what it's supposed to.

Staging continues to use DEBUG log level.

This is part of #1888 resolution.

tests/__main__.py

@@ -18,7 +18,7 @@ else:
     params = " ".join(sys.argv[1:])
 
 cmd = (
-    "py.test -v -n=4 --timeout=600 --timeout_method=thread --cov=dvc "
-    "{params} ".format(params=params)
+    "py.test -v -n=4 --timeout=600 --timeout_method=thread --log-level=debug"
+    " --cov=dvc {params} ".format(params=params)
 )
 check_call(cmd, shell=True)

tests/basic_env.py

@@ -163,7 +163,6 @@ class TestDvcFixture(TestGitFixture):
         super(TestDvcFixture, self).setUp()
         self.dvc = DvcRepo.init(self._root_dir)
         self.dvc.scm.commit("init dvc")
-        logger.setLevel("DEBUG")
 
     def tearDown(self):
         self.dvc.scm.git.close()

tests/conftest.py

@@ -11,8 +11,16 @@ from .basic_env import TestDirFixture
 
 
 @pytest.fixture(autouse=True)
-def debug(caplog):
-    with caplog.at_level("DEBUG", logger="dvc"):
+def reset_loglevel(request, caplog):
+    """
+    Use it to ensure log level at the start of each test
+    regardless of dvc.logger.setup(), Repo configs or whatever.
+    """
+    level = request.config.getoption("--log-level")
+    if level:
+        with caplog.at_level(level.upper(), logger="dvc"):
+            yield
+    else:
         yield