fix: Add Python 3.7 specific coverage configuration

- Create .coveragerc-py37 to exclude aio module from coverage on Python 3.7
- Use --cov-config flag to specify this file for py37 environments only
- This prevents the aio module exclusion from affecting Python 3.8+ tests

Author: taeold

.coveragerc-py37

@@ -0,0 +1,10 @@
+[run]
+# Coverage configuration specifically for Python 3.7 environments
+# Excludes the aio module which requires Python 3.8+ (Starlette dependency)
+# This file is only used by py37-* tox environments
+omit = 
+    */functions_framework/aio/*
+    */.tox/*
+    */tests/*
+    */venv/*
+    */.venv/*

tox.ini

@@ -33,9 +33,9 @@ extras =
     async
 setenv =
     PYTESTARGS = --cov=functions_framework --cov-branch --cov-report term-missing --cov-fail-under=100
-    # Python 3.7: Exclude aio module from coverage since it requires Python 3.8+ (Starlette dependency)
-    py37-ubuntu-22.04: PYTESTARGS = --cov=functions_framework --cov-branch --cov-report term-missing --cov-fail-under=100 --cov-omit='*/aio/*'
-    py37-macos-13: PYTESTARGS = --cov=functions_framework --cov-branch --cov-report term-missing --cov-fail-under=100 --cov-omit='*/aio/*'
+    # Python 3.7: Use .coveragerc-py37 to exclude aio module from coverage since it requires Python 3.8+ (Starlette dependency)
+    py37-ubuntu-22.04: PYTESTARGS = --cov=functions_framework --cov-config=.coveragerc-py37 --cov-branch --cov-report term-missing --cov-fail-under=100
+    py37-macos-13: PYTESTARGS = --cov=functions_framework --cov-config=.coveragerc-py37 --cov-branch --cov-report term-missing --cov-fail-under=100
     py37-windows-latest: PYTESTARGS =
     windows-latest: PYTESTARGS =
 commands = pytest {env:PYTESTARGS} {posargs}