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diff --git a/tests.as-root/make-patch.script b/tests.as-root/make-patch.script
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+#!/bin/sh
+#
+# Test making a patch between two different system images
+#
+# Copyright (C) 2012  Codethink Limited
+# 
+# This program 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; version 2 of the License.
+# 
+# This program 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, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+set -eu
+
+( # make the dummy stratum contain a chunk for a fake kernel
+    mkdir -p "$DATADIR/dummykernel"
+    cd "$DATADIR/dummykernel"
+    git init --quiet
+    cat <<EOF >dummykernel.morph
+{
+    "name": "dummykernel",
+    "kind": "chunk",
+    "install-commands": [
+        "mkdir -p \"\$DESTDIR/boot\"",
+        "touch \"\$DESTDIR\"/extlinux.conf",
+        "touch \"\$DESTDIR\"/boot/vmlinuz",
+        "touch \"\$DESTDIR\"/boot/System.map"
+    ]
+}
+EOF
+	
+	
+    git add .
+    git commit --quiet -m "Make dummy boot files"
+
+    cd "$DATADIR/morphs-repo"
+    git checkout --quiet master
+    sed -i -e 's/^.*sources.*$/&\
+        {\
+            "name": "dummykernel",\
+            "ref": "master"\
+        },\
+/' hello-stratum.morph
+
+    git commit --quiet -m "add dummy kernel" hello-stratum.morph
+)
+
+tests/morph build morphs-repo master hello-system.morph
+
+# save the stratum as we will apply the patch on top of this later
+cp "$DATADIR/cache/"*stratum* "$DATADIR"/farrokh-stratum
+
+ 
+( # make an evil stratum
+	cd "$DATADIR/chunk-repo"
+	git checkout --quiet -b evil farrokh
+	sed -i -e 's/hello/goodbye/g' hello.c
+	git add hello.c
+	git commit --quiet -m "Make the program evil"
+
+	cd "$DATADIR/morphs-repo"
+	git checkout --quiet -b evil master
+	sed -i -e 's/farrokh/evil/g' hello-stratum.morph
+	git add hello-stratum.morph
+	git commit --quiet -m "Build evil systems"
+)
+
+tests/morph build morphs-repo evil hello-system.morph
+
+# make a patch to make the system evil
+PATCH="$DATADIR"/patchfile
+tests/morph make-patch "$PATCH" morphs-repo master hello-system.morph \
+                                morphs-repo evil hello-system.morph
+
+UNPACKED="$DATADIR"/unpacked
+mkdir -p "$UNPACKED"
+tar -C "$UNPACKED" -xf "$DATADIR"/farrokh-stratum
+(cd "$UNPACKED" && tbdiff-deploy "$PATCH")
+"$UNPACKED"/bin/hello