gnu: pythonbitstring: Run tests.

* gnu/packages/python-xyx.scm (python-bitstring)[arguments]: Replace
check phase.
[native-inputs]: Add python-pytesst.

gnu/packages/python-xyz.scm

@@ -23324,6 +23324,18 @@ (define-public python-bitstring
          (base32
           "0jl6192dwrlm5ybkbh7ywmyaymrc3cmz9y07nm7qdli9n9rfpwzx"))))
     (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (replace 'check
+           (lambda* (#:key tests? inputs outputs #:allow-other-keys)
+             (when tests?
+               (add-installed-pythonpath inputs outputs)
+               (with-directory-excursion "test"
+                 (invoke "pytest")))
+             #t)))))
+    (native-inputs
+     `(("python-pytest" ,python-pytest)))
     (home-page "https://github.com/scott-griffiths/bitstring")
     (synopsis
      "Simple construction, analysis and modification of binary data")