pySim-trace_test: verify output of pySim-trace.py

At the moment we only verify that no exceptions occurred but the output
is not yet verfied.

Related: OS#6094
Change-Id: I3aaa779b5bd8f30936c284a80dbdcb2b0e06985c

tests/pySim-trace_test.sh

@@ -1,20 +1,92 @@
 #!/bin/bash
 
+# Utility to verify the functionality of pySim-trace.py
+#
+# (C) 2023 by Sysmocom s.f.m.c. GmbH
+# All Rights Reserved
+#
+# Author: Philipp Maier
+#
+# 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, either version 2 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 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/>.
+
 PYSIM_TRACE=../pySim-trace.py
 GSMTAP_TRACE=pySim-trace_test_gsmtap.pcapng
+TEMPFILE=temp.tmp
 
 echo "pySim-trace_test - a test program to test pySim-trace.py"
 echo "========================================================"
 
-$PYSIM_TRACE gsmtap-pyshark-pcap -f $GSMTAP_TRACE
-if [ $? -ne 0 ]; then
-	echo ""
-	echo "========================================================"
-	echo "Testrun with $GSMTAP_TRACE failed."
-	exit 1
+function usage {
+    echo "Options:"
+    echo "-o: generate .ok file"
+}
+
+function gen_ok_file {
+    $PYSIM_TRACE gsmtap-pyshark-pcap -f $GSMTAP_TRACE > $GSMTAP_TRACE.ok
+    echo "Generated file: $GSMTAP_TRACE.ok"
+    echo "------------8<------------"
+    cat $GSMTAP_TRACE.ok
+    echo "------------8<------------"
+}
+
+function run_test {
+    $PYSIM_TRACE gsmtap-pyshark-pcap -f $GSMTAP_TRACE | tee $TEMPFILE
+    if [ ${PIPESTATUS[0]} -ne 0 ]; then
+        echo ""
+        echo "========================================================"
+        echo "Testrun with $GSMTAP_TRACE failed (exception)."
+        rm -f $TEMPFILE
+        exit 1
+    fi
+
+    DIFF=`diff $GSMTAP_TRACE.ok $TEMPFILE`
+    if ! [ -z "$DIFF" ]; then
+        echo "Testrun with $GSMTAP_TRACE failed (unexpected output)."
+        echo "------------8<------------"
+        diff $GSMTAP_TRACE.ok $TEMPFILE
+        echo "------------8<------------"
+        rm -f $TEMPFILE
+        exit 1
+    fi
+
+    echo ""
+    echo "========================================================"
+    echo "trace parsed without problems -- everything ok!"
+    rm -f $TEMPFILE
+}
+
+OPT_GEN_OK_FILE=0
+while getopts ":ho" OPT; do
+    case $OPT in
+        h)
+            usage
+            exit 0
+            ;;
+        o)
+            OPT_GEN_OK_FILE=1
+            ;;
+        \?)
+            echo "Invalid option: -$OPTARG" >&2
+            exit 1
+        ;;
+    esac
+done
+
+if [ $OPT_GEN_OK_FILE -eq 1 ]; then
+    gen_ok_file
+    exit 0
+else
+    run_test
+    exit 0
 fi
-
-echo ""
-echo "========================================================"
-echo "trace parsed without problems -- everything ok!"
-