gnu: python-inform: Enable tests.

* gnu/packages/python-xyz.scm (python-inform)[source]: Fetch from
GitHub.
[arguments]: Remove '#:tests? #f'.
<#:test-flags>: Skip failing tests.
[native-inputs]: Add python-pytest.

Change-Id: Id2fcc5daadc104889d2621490e8e1f52e05a42ff

gnu/packages/python-xyz.scm

@@ -34431,17 +34431,25 @@ are plain text, reStructuredText and HTML.")
     (name "python-inform")
     (version "1.34")
     (source
-      (origin
-        (method url-fetch)
-        (uri (pypi-uri "inform" version))
-        (sha256
-          (base32
-            "1dzj09nxqpzrb4gnxi7dhbh2nvbkzl79vhwf2sg73f0l3dp10qy4"))))
+     (origin
+       (method git-fetch) ; no tests in PyPI release
+       (uri (git-reference
+             (url "https://github.com/kenkundert/inform")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "19ck1x8jplgq1lsy8cdv6hsygdbx310k92w4mkzl40bh4h49m1mk"))))
     (build-system pyproject-build-system)
     (arguments
-     `(#:tests? #f))  ; PyPI tarball lacks tests
+     (list
+      #:test-flags #~(list "-k" (string-append
+                                 ;; Test below needs the num2words package
+                                 "not test_plural_words"
+                                 ;; These last two failed with AssertionError
+                                 " and not test_inform"
+                                 " and not test_manual"))))
     (native-inputs
-      (list python-flit-core))
+      (list python-flit-core python-pytest))
     (propagated-inputs
       (list python-arrow))
     (home-page "https://inform.readthedocs.io")