CI: Run upstream testsuite

plan.fmf

@@ -1,4 +1,5 @@
 discover:
     how: fmf
+    dist-git-source: true
 execute:
     how: tmt

tests/testsuite/main.fmf

@@ -0,0 +1,19 @@
+summary: upstream testsuite
+require:
+  - gcc
+  - gcc-c++
+  - gdb
+  - python3-devel
+  - python3-test
+  - python3-cython
+  - python3-setuptools
+  - python3-pip
+  - python3-numpy
+  - python3-pytest
+  - flexiblas-devel  # for pythran
+  # ipython and pythran installed from PyPI, not available in RHEL
+test: |
+  pip install ipython==8.24.0 pythran==0.15.0 &&
+  cd $(dirname $TMT_SOURCE_DIR/cython-*/tests) &&
+  python3 runtests.py -vv --no-pyregr --exclude 'run.pstats_profile_test*'
+duration: 60m