fix coverage

Author: samuelcolvin

.github/workflows/ci.yml

@@ -50,8 +50,21 @@ jobs:
 
     - run: pip install -r requirements/testing.txt -r requirements/pyproject.txt
 
-    - run: make test
+    - name: test with dotenv
+      run: make test
+      env:
+        COVERAGE_FILE: .coverage.${{ runner.os }}-py${{ matrix.python }}-with-dotenv
+        CONTEXT: ${{ runner.os }}-py${{ matrix.python }}-with-dotenv
 
+    - run: pip uninstall -y python-dotenv
+
+    - name: test without dotenv
+      run: make test
+      env:
+        COVERAGE_FILE: .coverage.${{ runner.os }}-py${{ matrix.python }}-without-dotenv
+        CONTEXT: ${{ runner.os }}-py${{ matrix.python }}-without-dotenv
+
+    - run: coverage combine
     - run: coverage xml
 
     - uses: codecov/codecov-action@v2