drop support for python 3.7

pyproject.toml

@@ -27,16 +27,14 @@ classifiers = [
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: 3.8',
-    'Programming Language :: Python :: 3.7'
 ]
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.8"
 jsonschema = "^4.4.0"
 
 [tool.poetry.dev-dependencies]
 # Starting from Python 3.8, asynctest is replaced with a unittest.mock.AsyncMock in standard library.
-asynctest = { version = "0.13.0", python = "~3.7" }
 pytest = "^7"
 pytest-asyncio = "^0.20.3"
 pytest-cov = "^4.0.0"

tests/conftest.py

@@ -1,9 +1,4 @@
-try:
-    from unittest.mock import AsyncMock
-except ImportError:
-    # Python 3.7 and below don't include unittest.mock.AsyncMock. Hence,
-    # we need to resolve to a package on pypi.
-    from asynctest import CoroutineMock as AsyncMock
+from unittest.mock import AsyncMock
 
 import pytest
 

tests/v16/conftest.py

@@ -1,9 +1,4 @@
-try:
-    from unittest.mock import AsyncMock
-except ImportError:
-    # Python 3.7 and below don't include unittest.mock.AsyncMock. Hence,
-    # we need to resolve to a package on pypi.
-    from asynctest import CoroutineMock as AsyncMock
+from unittest.mock import AsyncMock
 
 import pytest
 

tests/v201/conftest.py

@@ -1,9 +1,4 @@
-try:
-    from unittest.mock import AsyncMock
-except ImportError:
-    # Python 3.7 and below don't include unittest.mock.AsyncMock. Hence,
-    # we need to resolve to a package on pypi.
-    from asynctest import CoroutineMock as AsyncMock
+from unittest.mock import AsyncMock
 
 import pytest