tidb/br/tests

Unit tests

Unit tests (the *_test.go files inside the source directory) should never rely on external programs.

Run make br_unit_test to execute all unit tests for br.

To run a specific test, pass ARGS into make test like

make br_unit_test ARGS='github.com/pingcap/tidb/br/pkg/cdclog --test.v --check.v --check.f TestColumn'
#                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#                       which package to test                  more extra test flags

You can also run unit tests directly via go test like:

make failpoint-enable

go test github.com/pingcap/tidb/br/pkg/cdclog --test.v --check.v --check.f TestColumn

make failpoint-disable

but note that:

• failpoints must be toggled manually

Integration tests

This folder contains all tests which relies on external processes such as TiDB.

Preparations

1. The following 9 executables must be copied or linked into the bin folder under the TiDB root dir:

   • bin/tidb-server
   • bin/tikv-server
   • bin/pd-server
   • bin/pd-ctl
   • bin/go-ycsb
   • bin/minio
   • bin/mc
   • bin/tiflash
   • bin/cdc

   The versions must be ≥2.1.0.

   What's more, there must be dynamic link library for TiFlash, see make target bin to learn more. You can install most of dependencies by running following commands:

   cd ${WORKSPACE}/tidb
   rm -rf third_bin/
   rm -rf bin/
   br/tests/download_integration_test_binaries.sh
   mkdir -p bin && mv third_bin/* bin/
   rm -rf third_bin/
   make failpoint-enable && make && make failpoint-disable #make tidb
   

2. The following programs must be installed:

   • mysql (the CLI client)
   • curl
   • openssl
   • wget
   • lsof
   • psmisc

3. The user executing the tests must have permission to create the folder /tmp/backup_restore_test. All test artifacts will be written into this folder.

If you have docker installed, you can skip step 1 and step 2 by running br/tests/up.sh --pull-images (in tidb directory) to build and run a testing Docker container.

Running

1. Build br.test using make build_for_br_integration_test
2. Check that all 9 required executables and br executable exist
3. Select the tests to run using export TEST_NAME="<test_name1> <test_name2> ..."
4. Execute br/tests/run.sh

If the first two steps are done before, you could also run tests/run.sh directly. This script will

1. Start PD, TiKV and TiDB in background with local storage
2. Find out all tests/*/run.sh and run it

Run tests/run.sh --debug to pause immediately after all servers are started.

After executing the tests, run make br_coverage to get a coverage report at /tmp/backup_restore_test/all_cov.html.

Writing new tests

1. New integration tests can be written as shell scripts in tests/TEST_NAME/run.sh. The script should exit with a nonzero error code on failure.
2. Add TEST_NAME to existing group in run_group_br_tests.sh(Recommended), or add a new group for it.
3. If you add a new group, the name of the new group must be added to CI br-integration-test.

Several convenient commands are provided:

• run_sql <SQL> — Executes an SQL query on the TiDB database
• run_br - Executes br.test with necessary settings
• run_lightning [CONFIG] — Starts tidb-lightning using tests/TEST_NAME/CONFIG.toml
• check_contains <TEXT> — Checks if the previous run_sql result contains the given text (in -E format)
• check_not_contains <TEXT> — Checks if the previous run_sql result does not contain the given text (in -E format)