2nd attempt

.travis.yml

@@ -123,6 +123,7 @@ script:
   - ${CABAL} v2-sdist all | color_cabal_output
   # Unpacking...
   - mv dist-newstyle/sdist/*.tar.gz ${DISTDIR}/
+  - cp -av th-tests ${DISTDIR}/th-tests.src
   - cd ${DISTDIR} || false
   - find . -maxdepth 1 -name '*.tar.gz' -exec tar -xvf '{}' \;
   # Generate cabal.project
@@ -131,7 +132,7 @@ script:
   - |
     echo 'packages: "text-*/*.cabal"' >> cabal.project
   - |
-    echo 'packages: ../th-tests/' >> cabal.project
+    echo 'packages: ./th-tests.src/' >> cabal.project
   - |
     echo "write-ghc-environment-files: always" >> cabal.project
   - "for pkg in $($HCPKG list --simple-output); do echo $pkg | sed 's/-[^-]*$//' | (grep -vE -- '^(text)$' || true) | sed 's/^/constraints: /' | sed 's/$/ installed/' >> cabal.project.local; done"