Test against the artifact that we will upload to PyPI

Author: youtux

.github/workflows/main.yml

@@ -6,8 +6,32 @@ on:
   workflow_dispatch:
 
 jobs:
+  build:
+    name: Build package
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          cache: "pip"
+      - name: Install pypa/build
+        run: >-
+          python3 -m pip install --user
+          build
+      - name: Build a binary wheel and a source tarball
+        run: python3 -m build
+      - name: Upload artifact
+        id: artifact-upload-step
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist-files
+          path: dist/*
+          if-no-files-found: error
+          compression-level: 0 # They are already compressed
   test-run:
     runs-on: ubuntu-latest
+    needs: build
     strategy:
       matrix:
         include:
@@ -33,7 +57,7 @@ jobs:
             ignore-test-outcome: false
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
@@ -61,6 +85,12 @@ jobs:
         run: |
           python -m poetry install --only=dev
 
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: dist-files
+          path: dist/
+
       - name: Type checking
         # Ignore errors for older pythons
         continue-on-error: ${{ matrix.ignore-typecheck-outcome }}
@@ -73,7 +103,8 @@ jobs:
         run: |
           source .venv/bin/activate
           coverage erase
-          tox run-parallel -f ${{ matrix.toxfactor }} --parallel-no-spinner --parallel-live
+          # Using `installpkg dist/*.tar.gz` because we want to install the pre-built package (want to test against that)
+          tox run-parallel -f ${{ matrix.toxfactor }} --parallel-no-spinner --parallel-live --installpkg dist/*.whl
           coverage combine
           coverage xml
 
@@ -94,18 +125,14 @@ jobs:
     permissions:
       id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
-    needs: test-run
+    needs:
+      - "test-run"
+      - "build"
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python
-        uses: actions/setup-python@v5
-      - name: Install pypa/build
-        run: >-
-          python3 -m
-          pip install
-          build
-          --user
-      - name: Build a binary wheel and a source tarball
-        run: python3 -m build
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: dist-files
+          path: dist/
       - name: Publish package distributions to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1