gnu: python-pkgconfig: Enable tests.

* gnu/packages/python.scm (python-pkgconfig)[arguments]: Replace 'check' phase.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu/packages/python.scm

@@ -8681,19 +8681,18 @@ CloudFront content delivery network.")
     (inputs
       `(("pkg-config" ,pkg-config)))
     (arguments
-      `(;; Tests fail with "ValueError: _type_ 'v' not supported" on Python 3,
-        ;; and on Python 2 they need the dl module deprecated since Python 2.6.
-        #:tests? #f
-        ;; Hard-code the path to pkg-config.
-        #:phases
+      `(#:phases
         (modify-phases %standard-phases
-          (add-before
-           'build 'patch
-           (lambda _
-             (substitute* "pkgconfig/pkgconfig.py"
-               (("cmd = 'pkg-config")
-                (string-append "cmd = '" (which "pkg-config"))))
-             #t)))))
+          (add-before 'build 'patch
+            ;; Hard-code the path to pkg-config.
+            (lambda _
+              (substitute* "pkgconfig/pkgconfig.py"
+                (("cmd = 'pkg-config")
+                 (string-append "cmd = '" (which "pkg-config"))))
+              #t))
+          (replace 'check
+            (lambda _
+              (invoke "nosetests" "test.py"))))))
     (home-page "https://github.com/matze/pkgconfig")
     (synopsis "Python interface for pkg-config")
     (description "This module provides a Python interface to pkg-config.  It