gnu: Add python-pytest-qt.

* gnu/packages/python-check.scm (python-pytest-qt): New variable.

gnu/packages/python-check.scm

@@ -7,7 +7,7 @@
 ;;; Copyright © 2020 Julien Lepiller <julien@lepiller.eu>
 ;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2020 Edouard Klein <edk@beaver-labs.com>
-;;; Copyright © 2020 Vinicius Monego <monego@posteo.net>
+;;; Copyright © 2020, 2021 Vinicius Monego <monego@posteo.net>
 ;;; Copyright © 2020 Tanguy Le Carrour <tanguy@bioneland.org>
 ;;; Copyright © 2021 Sharlatan Hellseher <sharlatanus@gmail.com>
 ;;; Copyright © 2021 Brendan Tildesley <mail@brendan.scot>
@@ -37,6 +37,7 @@
   #:use-module (gnu packages python-build)
   #:use-module (gnu packages python-web)
   #:use-module (gnu packages python-xyz)
+  #:use-module (gnu packages qt)
   #:use-module (gnu packages web)
   #:use-module (gnu packages xml)
   #:use-module (guix utils)
@@ -1084,6 +1085,42 @@ variables in the @file{pytest.ini} file.")
 libraries.")
     (license license:expat)))
 
+(define-public python-pytest-qt
+  (package
+    (name "python-pytest-qt")
+    (version "3.3.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "pytest-qt" version))
+       (sha256
+        (base32 "09c9psfn3zigpaw1l1cmynpa3csxa49wc2ih5lzl24skdkw0njvi"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:test-target "pytest"
+       #:phases
+       (modify-phases %standard-phases
+         (add-before 'check 'set-qpa
+           (lambda _
+             (setenv "QT_QPA_PLATFORM" "offscreen")
+             #t)))))
+    (propagated-inputs
+     `(("python-pyqt" ,python-pyqt)))
+    (native-inputs
+     `(("python-pytest" ,python-pytest)
+       ("python-pytest-runner" ,python-pytest-runner)
+       ("python-setuptools-scm" ,python-setuptools-scm)))
+    (home-page "https://github.com/pytest-dev/pytest-qt")
+    (synopsis "Pytest support for PyQt and PySide applications")
+    (description
+     "@code{pytest-qt} is a Pytest plugin that allows programmers to write
+tests for PyQt5 and PySide2 applications.
+
+The main usage is to use the @code{qtbot} fixture, responsible for handling
+@code{qApp} creation as needed and provides methods to simulate user
+interaction, like key presses and mouse clicks.")
+    (license license:expat)))
+
 (define-public python-codacy-coverage
   (package
     (name "python-codacy-coverage")