Merge pull request #183 from r1chardj0n3s/resolution

Switch to uv for speed, but also to have an easier time (no duplicati…

.github/workflows/ci.yml

@@ -17,10 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        # These versions match the minimum and maximum versions of pip in
-        # requirements.txt.
-        # An empty string here represents the latest version.
-        pip-version: ['==23.2', '']
+        uv-resolution: ['highest', 'lowest-direct']
         # The minimum version should be represented in setup.py.
         python-version: ["3.9", "3.10", "3.11", "3.12"]
         os: [ubuntu-latest, windows-latest]
@@ -34,28 +31,29 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - uses: actions/cache@v4
-        with:
-          path: ~/.cache/pip
-          # This is like the example but we use ``*requirements.txt`` rather
-          # than ``requirements.txt`` because we have multiple requirements
-          # files.
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/*requirements.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
+      - name: "Install uv"
+        run: "pip install --upgrade uv"
+
+      - name: "Create virtual environment"
+        id: venv
+        run: |
+          if [ "${{ matrix.os }}" = "windows-latest" ]; then
+            uv venv C:/Users/runner/.venv
+            echo "activate=C:/Users/runner/.venv/Scripts/Activate.ps1" >> "$GITHUB_OUTPUT"
+          else
+            uv venv /home/runner/.venv
+            echo "activate=source /home/runner/.venv/bin/activate" >> "$GITHUB_OUTPUT"
+          fi
+        shell: bash
 
       - name: "Install dependencies"
         run: |
-          python -m pip install --upgrade 'pip ${{ matrix.pip-version }}'
-          # We use '--ignore-installed' to avoid GitHub's cache which can cause
-          # issues - we have seen packages from this cache be cause trouble with
-          # pip-extra-reqs.
-          #
-          # We avoid "--upgrade" as we do version tests for the "pip" dependency.
-          python -m pip install --ignore-installed --editable .[dev]
+          ${{ steps.venv.outputs.activate }}
+          uv pip install --resolution=${{ matrix.uv-resolution }} --upgrade --editable .[dev]
 
       - name: "Lint"
         run: |
+          ${{ steps.venv.outputs.activate }}
           mypy .
           ruff check .
           ruff format --check .
@@ -69,7 +67,8 @@ jobs:
 
       - name: "Run tests"
         run: |
-          pytest -s -vvv --cov-fail-under 100 --cov=pip_check_reqs/ --cov=tests tests/
+          ${{ steps.venv.outputs.activate }}
+          pytest -s -vvv --cov-fail-under 100 --cov=pip_check_reqs/ --cov=tests tests/ --cov-report=xml
 
       - name: "Upload coverage to Codecov"
         # The original maintainer of this project is the one with access to the