This directory contains integration tests that test litecoind and its utilities in their entirety. It does not contain unit tests, which can be found in [/src/test](/src/test), [/src/wallet/test](/src/wallet/test), etc. There are currently two sets of tests in this directory: - [functional](/test/functional) which test the functionality of litecoind and litecoin-qt by interacting with them through the RPC and P2P interfaces. - [util](/test/util) which tests the litecoin utilities, currently only litecoin-tx. The util tests are run as part of `make check` target. The functional tests are run by the travis continuous build process whenever a pull request is opened. Both sets of tests can also be run locally. # Running tests locally Build for your system first. Be sure to enable wallet, utils and daemon when you configure. Tests will not run otherwise. ### Functional tests #### Dependencies The ZMQ functional test requires a python ZMQ library. To install it: - on Unix, run `sudo apt-get install python3-zmq` - on mac OS, run `pip3 install pyzmq` #### Running the tests Individual tests can be run by directly calling the test script, eg: ``` test/functional/replace-by-fee.py ``` or can be run through the test_runner harness, eg: ``` test/functional/test_runner.py replace-by-fee.py ``` You can run any combination (incl. duplicates) of tests by calling: ``` test/functional/test_runner.py ... ``` Run the regression test suite with: ``` test/functional/test_runner.py ``` Run all possible tests with ``` test/functional/test_runner.py --extended ``` By default, up to 4 tests will be run in parallel by test_runner. To specify how many jobs to run, append `--jobs=n` The individual tests and the test_runner harness have many command-line options. Run `test_runner.py -h` to see them all. #### Troubleshooting and debugging test failures ##### Resource contention The P2P and RPC ports used by the litecoind nodes-under-test are chosen to make conflicts with other processes unlikely. However, if there is another litecoind process running on the system (perhaps from a previous test which hasn't successfully killed all its litecoind nodes), then there may be a port conflict which will cause the test to fail. It is recommended that you run the tests on a system where no other litecoind processes are running. On linux, the test_framework will warn if there is another litecoind process running when the tests are started. If there are zombie litecoind processes after test failure, you can kill them by running the following commands. **Note that these commands will kill all litecoind processes running on the system, so should not be used if any non-test litecoind processes are being run.** ```bash killall litecoind ``` or ```bash pkill -9 litecoind ``` ##### Data directory cache A pre-mined blockchain with 200 blocks is generated the first time a functional test is run and is stored in test/cache. This speeds up test startup times since new blockchains don't need to be generated for each test. However, the cache may get into a bad state, in which case tests will fail. If this happens, remove the cache directory (and make sure litecoind processes are stopped as above): ```bash rm -rf cache killall litecoind ``` ##### Test logging The tests contain logging at different levels (debug, info, warning, etc). By default: - when run through the test_runner harness, *all* logs are written to `test_framework.log` and no logs are output to the console. - when run directly, *all* logs are written to `test_framework.log` and INFO level and above are output to the console. - when run on Travis, no logs are output to the console. However, if a test fails, the `test_framework.log` and litecoind `debug.log`s will all be dumped to the console to help troubleshooting. To change the level of logs output to the console, use the `-l` command line argument. `test_framework.log` and litecoind `debug.log`s can be combined into a single aggregate log by running the `combine_logs.py` script. The output can be plain text, colorized text or html. For example: ``` combine_logs.py -c | less -r ``` will pipe the colorized logs from the test into less. Use `--tracerpc` to trace out all the RPC calls and responses to the console. For some tests (eg any that use `submitblock` to submit a full block over RPC), this can result in a lot of screen output. By default, the test data directory will be deleted after a successful run. Use `--nocleanup` to leave the test data directory intact. The test data directory is never deleted after a failed test. ##### Attaching a debugger A python debugger can be attached to tests at any point. Just add the line: ```py import pdb; pdb.set_trace() ``` anywhere in the test. You will then be able to inspect variables, as well as call methods that interact with the litecoind nodes-under-test. If further introspection of the litecoind instances themselves becomes necessary, this can be accomplished by first setting a pdb breakpoint at an appropriate location, running the test to that point, then using `gdb` to attach to the process and debug. For instance, to attach to `self.node[1]` during a run: ```bash 2017-06-27 14:13:56.686000 TestFramework (INFO): Initializing test directory /tmp/user/1000/testo9vsdjo3 ``` use the directory path to get the pid from the pid file: ```bash cat /tmp/user/1000/testo9vsdjo3/node1/regtest/litecoind.pid gdb /home/example/litecoind ``` Note: gdb attach step may require `sudo` ### Util tests Util tests can be run locally by running `test/util/bitcoin-util-test.py`. Use the `-v` option for verbose output. # Writing functional tests You are encouraged to write functional tests for new or existing features. Further information about the functional test framework and individual tests is found in [test/functional](/test/functional).