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+;;; Python on Guile --- Python implementation atop Guile
+;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; This file is part of Python on Guile.
+;;;
+;;; This library is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU Lesser General Public License as
+;;; published by the Free Software Foundation, either version 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; This library is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Lesser General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+(define-module (test-completion)
+  #:use-module (language python completer)
+  #:use-module (language python spec)
+  #:use-module (ice-9 readline)
+  #:use-module (srfi srfi-64))
+
+(test-begin "completion")
+
+(test-equal "completion for os.conc<TAB> works"
+  "os.concat "
+  (let ((pyeval (@@ (language python spec) python-eval))
+        (port (mkstemp! "/tmp/pguile-readline.XXXXXX")))
+    (with-output-to-port port
+      (lambda _ (format #t "os.conc	")))
+    (let ((file (port-filename port)))
+      (close-port port)
+      (parameterize ((current-language python))
+        (pyeval "import os\n")
+        (with-readline-completion-function
+         (complete-python pyeval)
+         (lambda ()
+           (with-input-from-file file
+             (lambda ()
+               (set-readline-input-port! (current-input-port))
+               (readline)))))))))
+
+(test-end "completion")