br: maintain the README.md (pingcap#27526)

tests/README.md

@@ -3,22 +3,22 @@
 Unit tests (the `*_test.go` files inside the source directory) should *never* rely on external
 programs.
 
-Run `make test` to execute all unit tests.
+Run `make br_unit_test` to execute all unit tests for br.
 
 To run a specific test, pass `ARGS` into `make test` like
 
 ```sh
-make test ARGS='github.com/pingcap/br/pkg/cdclog --test.v --check.v --check.f TestColumn'
-#               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-#                which package to test            more extra test flags
+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:
 
 ```sh
 make failpoint-enable
 
-go test github.com/pingcap/br/pkg/cdclog --test.v --check.v --check.f TestColumn
+go test github.com/pingcap/tidb/br/pkg/cdclog --test.v --check.v --check.f TestColumn
 
 make failpoint-disable
 ```
@@ -67,7 +67,7 @@ If you have docker installed, you can skip step 1 and step 2 by running
 
 ## Running
 
-Run `make integration_test` to execute the integration tests. This command will
+Run `make br_integration_test` to execute the integration tests. This command will
 
 1. Build `br`
 2. Check that all 9 required executables and `br` executable exist
@@ -82,7 +82,7 @@ This script will
 
 Run `tests/run.sh --debug` to pause immediately after all servers are started.
 
-After executing the tests, run `make coverage` to get a coverage report at
+After executing the tests, run `make br_coverage` to get a coverage report at
 `/tmp/backup_restore_test/all_cov.html`.
 
 ## Writing new tests