Re-add `test_requires`

setup.cfg

@@ -35,6 +35,14 @@ install_requires =
     pystencils>=0.2.7
     jinja2
 # The usage of test_requires is discouraged, see `Dependency Management` docs
+test_requires =
+    pytest
+    pytest
+    pytest-html
+    ansi2html
+    pytest-cov
+    tensorflow
+    torch
 # Require a specific Python version, e.g. Python 2.7 or >= 3.4
 # python_requires = >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*