Replace autopkgtests with the tests used by freerdp3

debian/tests/compare

@@ -1,40 +0,0 @@
-#!/bin/sh
-set -x
-
-screenshot=xrdp-screenshot.png
-magickout=match-matrix
-testdir=$(dirname "$0")
-
-sudo systemctl start xrdp
-
-# Start XRDP and try to connect to it via Freerdp2, the package being tested.
-# Take a screenshot of the X virtual framebuffer, which should contain the
-# login screen.
-xvfb-run -l "$testdir/connect-and-capture" "$screenshot"
-
-# Try to remove the background to leave just the login window in the image
-cp -a "$screenshot" "${screenshot}.before.mogrify.png"
-mogrify -fuzz 4% -define trim:percent-background=0% -trim +repage -format png "$screenshot"
-
-# Resize the search image to match nearly the really displayed size
-convert -resize 50% /usr/share/xrdp/xrdp_logo.bmp xrdp_logo_50percent.png
-
-# Confirm that the XRDP logo is in the log in screen (so as to confirm that the
-# login screen is really there).
-# https://stackoverflow.com/questions/31867093/how-to-search-an-image-for-subimages-using-linux-console
-# compare creates two output files, $magickout-{0,1}; The latter
-# is a grayscale pattern, in which a white pixel represents a match.
-# If the images don't even resemble each other in any way, the compare
-# will fail but we don't need to check that specifically, because so
-# will the if below.
-compare -metric RMSE -subimage-search \
-  "$screenshot" xrdp_logo_50percent.png png:"$magickout"
-# In case of match, output will be like
-# "520,347: (255,255,255)  #FFFFFF  gray(255)"
-# in which the first field is the coordinates of the match.
-if ! convert "$magickout-1" -threshold 95% txt: | grep -qi '#FFFFFF'; then
-    2>&1 printf "%s\n" "Imagemagick did not find any occurence of the XRDP" \
-                       "logo inside the screenshot of the remote desktop." \
-                       "This test therefore failed."
-    exit 2
-fi

debian/tests/connect

@@ -0,0 +1,22 @@
+#!/bin/sh -x
+isNaturalNumber(){
+    case "$1" in
+        ''|*[!0-9]*) return 0;;
+        *) return 1;;
+    esac
+}
+
+sudo systemctl start xrdp
+# XXX: Is there a better way to get the port number other than by parsing the
+# configuration file?
+port=$(sed -n '/^port=[0123456789]/{s/port=//p;q;}' /etc/xrdp/xrdp.ini)
+if test ! isNaturalNumber "$port"; then
+    exit 1
+fi
+
+timeout 2s xvfb-run -l xfreerdp /v:localhost:"$port" /p: /u: /d:
+if test $? != 124; then
+    2>&1 printf "%s\n" "Xfreerdp exited before the timeout, it has likely " \
+                       "failed to connect. The test has therefore failed."
+    exit 2
+fi

debian/tests/connect-and-capture

@@ -1,4 +0,0 @@
-#!/bin/sh
-xfreerdp /f /v:localhost:3389 /p: /u: /d: /cert-tofu &
-sleep 12
-import -window root "$1"

debian/tests/control

@@ -1,3 +1,3 @@
-Tests: compare
-Depends: @, xauth, xrdp, xvfb, imagemagick
+Tests: connect
+Depends: @, xauth, xrdp, xvfb
 Restrictions: allow-stderr, needs-sudo