docs: update test manual (#497)

Author: airkei

DEVELOPMENT.md

@@ -25,6 +25,7 @@ docker compose -f docker/test_base/docker-compose_tests.yml build
 ```
 
 This `ota-test_base` image contains a copy of pre-build minimum `ota-image` under `/ota-image` folder, and pre-installed dependencies needed for running and testing OTA client.
+`tester` in the following commands is the service name of the test base container, which is defined in the `docker-compose_tests.yml`(e.g. `tester-ubuntu-22.04`).
 
 ### Run all tests at once
 
@@ -38,22 +39,30 @@ Directly execute pytest is also possible by override the command:
 
 ```bash
 docker compose -f docker/test_base/docker-compose_tests.yml run --rm tester \
-   python3 -m pytest /ota-client/tests/<specific_test_file> [<test_file_2> [...]]
+   tests/<specific_test_file>  [<test_file_2> [...]]
 ```
 
 ### Run specific tests manually by dropping to bash shell
 
 Directly drop to bash shell in the test base container as follow:
 
 ```bash
-docker compose -f docker/test_base/docker-compose_tests.yml run --rm tester bash
+docker compose -f docker/test_base/docker-compose_tests.yml run --entrypoint bash --rm tester
 ```
 
-And then run specific tests as you want:
+And then run specific tests as you want after copying the source code to the container based on the `entry_point.sh`:
 
 ```bash
+# copy the source code to the container
+cp -r /otaclient_src /test_root
+# change the working directory to the test_root
+cd /test_root
+# create the hatch environment
+hatch env create dev
+# enter the hatch environment
+hatch shell dev
 # inside the container
-python3 -m pytest /ota-client/tests/<specific_test_file> [<test_file_2> [...]]
+python3 -m pytest tests/<specific_test_file> [<test_file_2> [...]]
 ```
 
 ## How to update protobuf