chore: add back codecov reports

.github/workflows/test.yml

@@ -3,10 +3,10 @@ name: CI Tests
 on:
   push:
     branches:
-    - main
+      - main
   pull_request:
     branches:
-    - main
+      - main
   workflow_dispatch:
     inputs:
       tmate_debug_enabled:
@@ -24,8 +24,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macOS-latest, windows-latest]
-        python-version: ["3.7", "3.8", "3.9","3.10" ]
+        os: [ ubuntu-latest, macOS-latest, windows-latest ]
+        python-version: [ "3.7", "3.8", "3.9","3.10" ]
     name: Test Python ${{ matrix.python-version }} ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
@@ -59,3 +59,9 @@ jobs:
         run: |
           python -m pip install -e . --no-deps
           python -m xonsh run-tests.xsh test --report-coverage --no-amalgam -- --timeout=240
+      - name: Upload coverage to Codecov
+        if: ${{ startsWith(matrix.python-version, '3.10') }}
+        uses: codecov/codecov-action@v2
+        with:
+          verbose: true
+          flags: ${{ matrix.os }}