Fix the pre-release test environment

Author: Ezibenroc

.github/workflows/buildwheels.yml

@@ -54,7 +54,7 @@ jobs:
       - name: Build wheels
         uses: pypa/[email protected]
         env:
-          CIBW_TEST_REQUIRES: hypothesis
+          CIBW_TEST_REQUIRES: hypothesis pytest
           CIBW_TEST_COMMAND: "python {project}/test.py -v && python {project}/cydoctest.py -v"
           CIBW_SKIP: "pp* cp36-* cp37-*"
           CIBW_ARCHS: ${{ matrix.cibw_archs }}