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diff --git a/tests/openpgp/trust-pgp/common.scm b/tests/openpgp/trust-pgp/common.scm
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+++ b/tests/openpgp/trust-pgp/common.scm
@@ -0,0 +1,66 @@
+#!/usr/bin/env gpgscm
+
+;; Copyright (C) 2017 Damien Goutte-Gattat
+;;
+;; This file is part of GnuPG.
+;;
+;;
+;; GnuPG is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; GnuPG 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 General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+(load (in-srcdir "tests" "openpgp" "defs.scm"))
+
+;; Redefine GPG without --always-trust.
+(define GPG `(,(tool 'gpg)))
+
+;; Helper constants for setownertrust.
+(define MARGINALTRUST "4")
+(define FULLTRUST "5")
+(define ULTIMATETRUST "6")
+
+;; Assign OWNERTRUST to the key identified by the provided
+;; fingerprint KEYFPR.
+(define (setownertrust keyfpr ownertrust)
+  (pipe:do
+    (pipe:echo (string-append keyfpr ":" ownertrust ":\n"))
+    (pipe:gpg `(--import-ownertrust))))
+
+;; Force a trustdb update.
+(define (updatetrustdb)
+  (call-check `(,@GPG --check-trustdb --yes)))
+
+;; IDs of all the keys involved in those tests.
+(define ALICE "FD9B20DD3C98123EEEAF8CC51BA41538D2E656B5")
+(define BOBBY "4D3F59F4D8030FD2D844AFEBA5BAC3ED125CCAE5")
+(define CAROL "6C62735E454CCDD79FA6CA601079113AEC1282FD")
+(define DAVID "A0607635198CABA2C467FAA64CE5BB42E3984000")
+(define FRANK "CE1A0E07CF8A20CBF8DC47D6DB9017DBAE6CD0EF")
+(define GRACE "B935F4B8DA009AFBCCDD41386653A183007F8345")
+(define HEIDI "0389C0B7990E10520B334F23756F1571EDA9184B")
+
+;; Initialize a given scenario.
+;; NAME should be the basename of the scenario file
+;; in this directory.
+(define (initscenario name)
+  (setup-environment)
+  ;; Make sure we are using the PGP trust model. This may no
+  ;; be the default model in the future.
+  (let ((trust-model (gpg-config 'gpg "trust-model")))
+    (trust-model::update "pgp"))
+  ;; Load the scenario's public keys.
+  (call-check `(,@GPG --import
+		      ,(in-srcdir "tests" "openpgp" "trust-pgp"
+				  (string-append name ".asc"))))
+  ;; Use Alice's key as root for all trust evaluations.
+  (setownertrust ALICE ULTIMATETRUST)
+  (updatetrustdb))