coverage.yml

# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: Code Coverage
on:
  pull_request:

# Declare default permissions as read only.
permissions: read-all

jobs:
  coverage:
    runs-on: ubuntu-latest
    steps:
      - name: Setup Python
        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
        with:
          python-version: "3.10"

      - run: pip install nox coverage

      - name: Checkout base branch
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          ref: ${{ github.base_ref }}

      - name: Calculate base code coverage
        run: |
          nox --sessions unit-3.10
          coverage report --show-missing
          export CUR_COVER=$(coverage report | awk '$1 == "TOTAL" {print $NF+0}')
          echo "CUR_COVER=$CUR_COVER" >> $GITHUB_ENV
          coverage erase

      - name: Checkout PR branch
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Calculate PR code coverage
        run: |
          nox --sessions unit-3.10
          coverage report --show-missing
          export PR_COVER=$(coverage report | awk '$1 == "TOTAL" {print $NF+0}')
          echo "PR_COVER=$PR_COVER" >> $GITHUB_ENV
          coverage erase

      - name: Verify code coverage. If your reading this and the step has failed, please add tests to cover your changes.
        run: |
          echo "BASE BRANCH CODE COVERAGE is ${{ env.CUR_COVER }}%"
          echo "PULL REQUEST CODE COVERAGE is ${{ env.PR_COVER }}%"
          if [ "${{ env.PR_COVER }}" -lt "${{ env.CUR_COVER }}"  ]; then
            exit 1;
          fi