Bump pytest to version 6.0.1 and yarl to 1.5.1 (#4126)

* Update pytest to version 6.0.1

* remove some awful monkeypatching

* use new import mode

* Update yarl to 1.5.1

pyproject.toml

@@ -17,3 +17,7 @@
         | redbot\/vendored
     )/
     '''
+
+[tool.pytest.ini_options]
+    minversion = "6.0"
+    addopts = "--import-mode=importlib"

redbot/pytest/core.py

@@ -4,13 +4,11 @@ from pathlib import Path
 import weakref
 
 import pytest
-from _pytest.monkeypatch import MonkeyPatch
 from redbot.core import Config
 from redbot.core.bot import Red
 from redbot.core import config as config_module, drivers
 
 __all__ = [
-    "monkeysession",
     "override_data_path",
     "coroutine",
     "driver",
@@ -30,13 +28,6 @@ __all__ = [
 ]
 
 
-@pytest.fixture(scope="session")
-def monkeysession(request):
-    mpatch = MonkeyPatch()
-    yield mpatch
-    mpatch.undo()
-
-
 @pytest.fixture(autouse=True)
 def override_data_path(tmpdir):
     from redbot.core import data_manager

redbot/pytest/downloader.py

@@ -10,7 +10,6 @@ from redbot.cogs.downloader.repo_manager import RepoManager, Repo, ProcessFormat
 from redbot.cogs.downloader.installable import Installable, InstalledModule
 
 __all__ = [
-    "patch_relative_to",
     "repo_manager",
     "repo",
     "bot_repo",
@@ -38,14 +37,6 @@ async def fake_current_commit(*args, **kwargs):
     return "fake_result"
 
 
-@pytest.fixture(scope="module", autouse=True)
-def patch_relative_to(monkeysession):
-    def fake_relative_to(self, some_path: Path):
-        return self
-
-    monkeysession.setattr("pathlib.Path.relative_to", fake_relative_to)
-
-
 @pytest.fixture
 def repo_manager(tmpdir_factory):
     rm = RepoManager()

setup.cfg

@@ -58,7 +58,7 @@ install_requires =
     typing-extensions==3.7.4.2
     uvloop==0.14.0; sys_platform != "win32" and platform_python_implementation == "CPython"
     websockets==8.1
-    yarl==1.5.0
+    yarl==1.5.1
 
 [options.extras_require]
 docs =
@@ -94,6 +94,7 @@ style =
     typed-ast==1.4.1
 test =
     astroid==2.4.2
+    iniconfig==1.0.1
     isort==4.3.21
     lazy-object-proxy==1.4.3
     mccabe==0.6.1
@@ -103,12 +104,11 @@ test =
     py==1.9.0
     pylint==2.5.3
     pyparsing==2.4.7
-    pytest==5.4.3
+    pytest==6.0.1
     pytest-asyncio==0.14.0
     pytest-mock==3.2.0
     six==1.15.0
     toml==0.10.1
-    wcwidth==0.2.5
     wrapt==1.12.1
 
 [options.entry_points]