add Debian autopkgtests

debian/tests/control

@@ -0,0 +1,3 @@
+# https://people.debian.org/~eriberto/README.package-tests.html
+Tests: syntax, phpunit
+Depends: davical, php-cli, phpunit

debian/tests/phpunit

@@ -0,0 +1,8 @@
+#!/bin/bash
+# run our test suite, but on the installed package
+
+set -e
+
+# 2) phpunit tests
+phpunit --include-path "/usr/share/davical:/usr/share/awl" testing/phpunit
+

debian/tests/syntax

@@ -0,0 +1,19 @@
+#!/bin/bash
+# run our test suite, but on the installed package
+
+set -e
+
+# 1) simple php syntax check
+for PHP in /usr/share/davical/htdocs/*.php /usr/share/davical/inc/*.php
+do
+    php -l ${PHP} >> $AUTOPKGTEST_TMP/test-syntax
+done
+
+if grep -v 'No syntax errors detected' $AUTOPKGTEST_TMP/test-syntax
+then
+    cat $AUTOPKGTEST_TMP/test-syntax
+    exit 1
+else
+    echo "OK (Syntax checked)";
+fi
+rm $AUTOPKGTEST_TMP/test-syntax