test-network: extend comments how to run the test

(cherry picked from commit 356e9bc0181f575e6c208d343f8e2eef151abc47)
(cherry picked from commit 1104de48472ab2a31f968e8b9a050dc6fa766580)

diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index b6262a6f556ba509a7626e5fa100523d44fce26b..15597d6f1812332d790f0c78f5c40a0f1241239f 100755 (executable)
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -7,13 +7,21 @@
 #
 # To run an individual test, specify it as a command line argument in the form
 # of <class>.<test_function>. E.g. the NetworkdMTUTests class has a test
-# function called test_ipv6_mtu().  To run just that test use:
+# function called test_ipv6_mtu(). To run just that test use:
 #
-#    sudo ./systemd-networkd-tests.py NetworkdMTUTests.test_ipv6_mtu
+#    run0 ./systemd-networkd-tests.py NetworkdMTUTests.test_ipv6_mtu
 #
-# Similarly, other individual tests can be run, eg.:
+# Similarly, other individual tests can be run, e.g.:
 #
-#    sudo ./systemd-networkd-tests.py NetworkdNetworkTests.test_ipv6_neigh_retrans_time
+#    run0 ./systemd-networkd-tests.py NetworkdNetworkTests.test_ipv6_neigh_retrans_time
+#
+# To run the test with the executables (systemd-networkd, networkctl, systemd-udevd and so on)
+# in your build directory, --build-dir=/path/to/build/ option can be used:
+#
+#    run0 ./systemd-networkd-tests.py --build-dir=/path/to/build NetworkdNetworkTests.test_address_static
+#
+# Note, unlike the long getopt option handling, the path must be specified after '=', rather than space.
+# Otherwise the path is recognized as a test case, and the test run will fail.
 
 import argparse
 import datetime