Revert "drop support for python 3.7" (#597)

Reverts mobilityhouse/ocpp#585

As this is breaking should be included in release 1.0.0

.github/workflows/pull-request.yml

@@ -11,6 +11,7 @@ jobs:
     strategy:
       matrix:
         version:
+        - "3.7"
         - "3.8"
         - "3.9"
         - "3.10"

pyproject.toml

@@ -27,14 +27,16 @@ 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 = "^3.8"
+python = "^3.7"
 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

@@ -1,4 +1,9 @@
-from unittest.mock import AsyncMock
+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
 
 import pytest
 

tests/v16/conftest.py

@@ -1,4 +1,9 @@
-from unittest.mock import AsyncMock
+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
 
 import pytest
 

tests/v201/conftest.py

@@ -1,4 +1,9 @@
-from unittest.mock import AsyncMock
+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
 
 import pytest