PICARD-1935: Include tests in sdist

Verify in CI the sdist package is complete and passes tests.

Author: phw

.github/workflows/run-tests.yml

@@ -113,3 +113,8 @@ jobs:
     - name: Test running installed package
       if: runner.os != 'Windows'
       run: picard --long-version
+    - name: Verify sdist package
+      if: runner.os != 'Windows'
+      run: |
+        pip install pytest
+        scripts/package/run-sdist-test.sh

MANIFEST.in

@@ -1,5 +1,4 @@
 graft po
-prune test
 
 recursive-include scripts *.in
 recursive-exclude scripts picard
@@ -9,4 +8,8 @@ include *.in
 include *.md
 include *.txt
 
+recursive-include test *.py
+recursive-include test/data *
+
 exclude org.musicbrainz.Picard.appdata.xml
+exclude win-version-info.txt

scripts/package/run-sdist-test.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# Build the sdist archive, extract it and run the tests.
+
+set -e
+
+rm -rf dist
+python3 setup.py sdist
+cd dist
+SDIST_ARCHIVE=$(echo picard-*.tar.gz)
+tar xvf "$SDIST_ARCHIVE"
+cd "${SDIST_ARCHIVE%.tar.gz}"
+pytest --verbose