Adjust test for Pytest 7+

Pytest7 deprecated usage of pytest.warns(None). See the following GitHub
issues/PRs:

* pytest-dev/pytest#8645
* pytest-dev/pytest#9404

Signed-off-by: Peter Lemenkov <[email protected]>

Author: lemenkov

test/unit/test_client.py

@@ -1,14 +1,15 @@
 import pytest
+import warnings
 
 import ipfshttpclient
 
 
 def test_assert_version():
-	with pytest.warns(None) as warnings:
+	with warnings.catch_warnings():
 		# Minimum required version
 		ipfshttpclient.assert_version("0.1.0", "0.1.0", "0.2.0", ["0.1.2"])
 
-	assert len(warnings) == 0
+	warnings.simplefilter("error")
 
 	# Too high version
 	with pytest.warns(ipfshttpclient.exceptions.VersionMismatch):
@@ -41,4 +42,4 @@ def test_client_session_context():
 	assert client._client._session is None
 	with client:
 		assert client._client._session is not None
-	assert client._client._session is None
+	assert client._client._session is None

tox.ini

@@ -13,7 +13,7 @@ isolated_build = true
 
 [testenv]
 deps =
-	pytest     ~= 6.2
+	pytest     >= 7.0.0
 	pytest-cov ~= 2.11
 	pytest-dependency  ~= 0.5
 	pytest-localserver ~= 0.5