[dep] Introduce asynctest as dev dependency for Py < 3.8

poetry.lock

@@ -60,6 +60,14 @@ optional = false
 python-versions = ">=3.5.3"
 version = "3.0.1"
 
+[[package]]
+category = "dev"
+description = "Enhance the standard unittest package with features for testing asyncio libraries"
+name = "asynctest"
+optional = false
+python-versions = ">=3.5"
+version = "0.13.0"
+
 [[package]]
 category = "dev"
 description = "Atomic file writes."
@@ -703,7 +711,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["pathlib2", "unittest2", "jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "e56d52242197afa63bf2e57bbb2219dcb8e82ab2918056cb7e055f17b2675bc1"
+content-hash = "07d8d6d93090197d1860f28e8935833af0c0c5d38a162b7fb158dbcdd5a9abf1"
 python-versions = "^3.5.3"
 
 [metadata.files]
@@ -737,6 +745,10 @@ async-timeout = [
     {file = "async-timeout-3.0.1.tar.gz", hash = "sha256:0c3c816a028d47f659d6ff5c745cb2acf1f966da1fe5c19c77a70282b25f4c5f"},
     {file = "async_timeout-3.0.1-py3-none-any.whl", hash = "sha256:4291ca197d287d274d0b6cb5d6f8f8f82d434ed288f962539ff18cc9012f9ea3"},
 ]
+asynctest = [
+    {file = "asynctest-0.13.0-py3-none-any.whl", hash = "sha256:5da6118a7e6d6b54d83a8f7197769d046922a44d2a99c21382f0a6e4fadae676"},
+    {file = "asynctest-0.13.0.tar.gz", hash = "sha256:c27862842d15d83e6a34eb0b2866c323880eb3a75e4485b079ea11748fd77fac"},
+]
 atomicwrites = [
     {file = "atomicwrites-1.4.0-py2.py3-none-any.whl", hash = "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197"},
     {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},

pyproject.toml

@@ -26,6 +26,7 @@ pre-commit = "^1.18"
 pytest = "^6.0"
 pytest-cov = "^2.7"
 pytest-asyncio = "^0.14.0"
+asynctest = "^0.13.0"
 coverage-badge = "^1.0"
 pytest-sugar = "^0.9.2"