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You can run the unit tests of the ns-3
distribution by running the
“check” command,
./waf check
You should see a report from each unit test that executes indicating that the test has passed.
Entering directory `repos/ns-3-allinone/ns-3-dev/build' Build finished successfully (00:00:00) -- Running NS-3 C++ core unit tests... PASS AddressHelper PASS Wifi PASS DcfManager ... PASS Object PASS Ptr PASS Callback -- Running NS-3 Python bindings unit tests... ........... ---------------------------------------------------------------------- Ran 11 tests in 0.003s OK
This command is typically run by users
to quickly verify that an
ns-3
distribution has built correctly.
You can also run our regression test suite to ensure that your distribution and
tool chain have produced binaries that generate output that is identical to
known-good reference output files. You downloaded these reference traces to
your machine during the download process above. (Warning: The ns-3.2
and ns-3.3
releases do not use the ns-3-allinone
environment
and require you to be online when you run regression tests because they
dynamically synchronize the reference traces directory with an online
repository immediately prior to the run).
During regression testing Waf will run a number of tests that generate what we call trace files. The content of these trace files are compared with the reference traces. If they are identical, the regression tests report a PASS status. If a regression test fails you will see a FAIL indication along with a pointer to the offending trace file and its associated reference trace file along with a suggestion on diff parameters and options in order to see what has gone awry. If the error was discovered in a pcap file, it will be useful to convert the pcap files to text using tcpdump prior to comparison.
Some regression tests wmay be SKIPped if the required support is not present.
To run the regression tests, you provide Waf with the regression flag.
./waf --regression
You should see messages indicating that many tests are being run and are passing.
Entering directory `repos/ns-3-allinone/ns-3-dev/build' [647/669] regression-test (test-csma-bridge) [648/669] regression-test (test-csma-broadcast) [649/669] regression-test (test-csma-multicast) [650/669] regression-test (test-csma-one-subnet) PASS test-csma-multicast [651/669] regression-test (test-csma-packet-socket) PASS test-csma-bridge ... Regression testing summary: PASS: 22 of 22 tests passed Build finished successfully (00:00:23)
If you want to take a look at an example of what might be checked during a regression test, you can do the following:
cd build/debug/regression/traces/second.ref tcpdump -nn -tt -r second-2-0.pcap
The output should be clear to anyone who is familiar with tcpdump or net sniffers. We'll have much more to say on pcap files later in this tutorial.
Remember to cd back into the top-level ns-3
directory
after you are done:
cd ../../../../..
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