gnu: emacs-ert-runner: Update to latest upstream commit.

The latest tag is many years old, and the latest upstream branch includes
important fixes such as displaying correctly the backtrace upon encountering
errors (see:
4b6e6cb81f).

* gnu/packages/emacs-xyz.scm (emacs-ert-runner): Update to the latest upstream
commit.
[origin]: Use GIT-FETCH instead of URL-FETCH to mitigate against GitHub's
dynamically generated tarballs.

gnu/packages/emacs-xyz.scm

@@ -31,7 +31,7 @@
 ;;; Copyright © 2017 Peter Mikkelsen <petermikkelsen10@gmail.com>
 ;;; Copyright © 2017, 2018 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2017 Mike Gerwitz <mtg@gnu.org>
-;;; Copyright © 2017, 2018 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2017, 2018, 2019 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2018 Sohom Bhattacharjee <soham.bhattacharjee15@gmail.com>
 ;;; Copyright © 2018 Mathieu Lirzin <mthl@gnu.org>
 ;;; Copyright © 2018, 2019 Pierre Neidhardt <mail@ambrevar.xyz>
@@ -6906,18 +6906,22 @@ Emacs.")
 ;; Tests for ert-runner have a circular dependency with ecukes, and therefore
 ;; cannot be run
 (define-public emacs-ert-runner
+  (let ((version "0.7.0")
+        (revision "1")
+        (commit "90b8fdd5970ef76a4649be60003b37f82cdc1a65"))
     (package
       (name "emacs-ert-runner")
-    (version "0.7.0")
+      (version (git-version "0.7.0" revision commit))
       (source
        (origin
-       (method url-fetch)
-       (uri (string-append "https://github.com/rejeep/ert-runner.el/archive/v"
-                           version ".tar.gz"))
-       (file-name (string-append name "-" version ".tar.gz"))
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/rejeep/ert-runner.el.git")
+               (commit commit)))
+         (file-name (git-file-name name version))
          (sha256
           (base32
-         "1657nck9i96a4xgl8crfqq0s8gflzp21pkkzwg6m3z5npjxklgwp"))))
+           "04nxmyzncacj2wmzd84vv9wkkr2dk9lcb10dvygqmg3p1gadnwzz"))))
       (build-system emacs-build-system)
       (inputs
        `(("emacs-ansi" ,emacs-ansi)
@@ -6948,7 +6952,7 @@ Emacs.")
       (description "@code{ert-runner} is a tool for Emacs projects tested
 using ERT.  It assumes a certain test structure setup and can therefore make
 running tests easier.")
-    (license license:gpl3+)))
+      (license license:gpl3+))))
 
 (define-public ert-runner
   (deprecated-package "ert-runner" emacs-ert-runner))