TST: add a test that checks utils

tests/test_utils.sh

+#!/bin/bash
+#
+# This file is a part of the CaosDB Project.
+#
+# Copyright (C) 2020 Henrik tom Wörden <h.tomwoerden@indiscale.com>
+# Copyright (C) 2020 IndiScale <info@indiscale.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+
+# Dump a database with all procedures, permissions, structure and data
+set -e
+
+if [ -z "$UTILSPATH" ]; then
+    UTILSPATH="$(realpath $(dirname $(dirname $0)))/utils"
+    export UTILSPATH
+fi
+
+MAX_ENTITIES=500
+# Load settings from .config and defaults #####################################
+. $UTILSPATH/load_settings.sh
+
+# load useful functions #######################################################
+. $UTILSPATH/helpers.sh
+
+# Test mysql connection
+echo -n 'testing connection... '
+$UTILSPATH/make_db test-connection > /dev/null
+echo '[Ok]'
+
+echo -n 'size of database... '
+# check size of database
+num=$(mysql_execute "SELECT COUNT(*) FROM entities" | sed 's/COUNT(\*)//')
+if [ $num -gt $MAX_ENTITIES ]; then
+    echo "There are more than $MAX_ENTITIES entities..."\
+            "Do not run this on a production instance!"
+    exit 1
+elif [ $num -lt 5 ]; then
+    echo "There are less than 5 entities..."\
+            "Please use this with a database with some example content!"
+    exit 1
+fi
+echo '[Ok]'
+
+###############################################################################
+# Below we create a dump, then run tests, and create a dump again. Afterwards
+# the dumps are checked if they are not empty and whether they differ. 
+# This should make sure that tests interfere somehow with the real database.
+# This also provides a very basic test that sql dumps work.
+###############################################################################
+
+# creating a dump of current db
+backupdir=$(realpath 'tmp_backup')
+if [ -e "$backupdir" ]; then
+    echo "Temporary directory $backupdir already exists. Please remove it"
+    exit 1
+fi
+echo -n 'creating initial dump... '
+BACKUPDIR=$backupdir $UTILSPATH/backup.sh > /dev/null
+echo '[Ok]'
+# run normal tests
+echo -n 'running sql tests... '
+$UTILSPATH/make_db test > /dev/null
+echo '[Ok]'
+
+echo -n 'creating secondary dump... '
+BACKUPDIR=$backupdir $UTILSPATH/backup.sh > /dev/null
+echo '[Ok]'
+
+#compare dumps
+pushd $backupdir > /dev/null
+echo -n 'checking dumps... '
+for filename in "./*.sql"; do
+    # assures entities table is created, i.e. there is content
+    cat $filename | grep "CREATE TABLE .entities." > /dev/null
+    # remove time stamp
+    sed -i '/Dump completed on/d' $filename
+done
+echo '[Ok]'
+
+echo -n 'comparing dumps... '
+if [ ! -z "$(diff *)" ]; then
+    echo $(diff *)
+    echo "The second dump differs from the first one. This possibly means that tests changed the real database."
+    exit 1
+fi
+echo '[Ok]'
+popd > /dev/null
+rm -r $backupdir
+echo '[Completed]'