move gtest installation before compilation

docs/cn/getting_started.md

@@ -38,6 +38,12 @@ If you need to enable cpu/heap profilers in examples:
 $ sudo apt-get install libgoogle-perftools-dev
 ```
 
+If you need to run tests, install and compile libgtest-dev (which is not compiled yet):
+```shell
+$ sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libgtest* /usr/lib/ && cd -
+```
+The directory of gtest source code may be changed, try `/usr/src/googletest/googletest` if `/usr/src/gtest` is not there.
+
 ### Compile brpc with config_brpc.sh
 git clone brpc, cd into the repo and run
 ```shell
@@ -64,17 +70,12 @@ $ ./echo_client
 Examples link brpc statically, if you need to link the shared version, `make clean` and `LINK_SO=1 make`
 
 **Run tests**
-
-Install and compile libgtest-dev (which is not compiled yet):
-
 ```shell
-$ sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libgtest* /usr/lib/ && cd -
+$ cd test
+$ make
+$ sh run_tests.sh
 ```
 
-The directory of gtest source code may be changed, try `/usr/src/googletest/googletest` if `/usr/src/gtest` is not there.
-
-Rerun `config_brpc.sh`, `make` in test/, and `sh run_tests.sh`
-
 ### Compile brpc with cmake
 ```shell
 $ mkdir build && cd build && cmake .. && make
@@ -97,9 +98,6 @@ $ ./echo_client
 Examples link brpc statically, if you need to link the shared version, use `cmake -DEXAMPLE_LINK_SO=ON ..`
 
 **Run tests**
-
-Install gtest like just written above.
-
 ```shell
 $ mkdir build && cd build && cmake -DBUILD_UNIT_TESTS=ON .. && make
 $ cd test && sh run_tests.sh
@@ -129,6 +127,11 @@ If you need to enable cpu/heap profilers in examples:
 $ sudo yum install gperftools-devel
 ```
 
+If you need to run tests, install and compile gtest-devel (which is not compiled yet):
+```shell
+$ sudo yum install gtest-devel
+```
+
 ### Compile brpc with config_brpc.sh
 
 git clone brpc, cd into the repo and run
@@ -157,10 +160,11 @@ $ ./echo_client
 Examples link brpc statically, if you need to link the shared version, `make clean` and `LINK_SO=1 make`
 
 **Run tests**
-
-Install gtest-devel.
-
-Rerun `config_brpc.sh`, `make` in test/, and `sh run_tests.sh`
+```shell
+$ cd test
+$ make
+$ sh run_tests.sh
+```
 
 ### Compile brpc with cmake
 ```shell
@@ -185,7 +189,6 @@ $ ./echo_client
 Examples link brpc statically, if you need to link the shared version, use `cmake -DEXAMPLE_LINK_SO=ON ..`
 
 **Run tests**
-
 ```shell
 $ mkdir build && cd build && cmake -DBUILD_UNIT_TESTS=ON .. && make
 $ cd test && sh run_tests.sh
@@ -266,7 +269,12 @@ $ brew install gflags protobuf leveldb
 
 If you need to enable cpu/heap profilers in examples:
 ```shell
-$ brew install google-perftools
+$ brew install gperftools
+```
+
+If you need to run tests, install and compile googletest (which is not compiled yet):
+```shell
+$ git clone https://github.com/google/googletest && cd googletest/googletest && mkdir build && cd build && cmake .. && make && sudo mv libgtest* /usr/lib/ && cd -
 ```
 
 ### Compile brpc with config_brpc.sh
@@ -293,15 +301,12 @@ $ ./echo_client
 Examples link brpc statically, if you need to link the shared version, `make clean` and `LINK_SO=1 make`
 
 **Run tests**
-
-Install and compile googletest (which is not compiled yet):
-
 ```shell
-$ git clone https://github.com/google/googletest && cd googletest/googletest && mkdir build && cd build && cmake .. && make && sudo mv libgtest* /usr/lib/ && cd -
+$ cd test
+$ make
+$ sh run_tests.sh
 ```
 
-Rerun `config_brpc.sh`, `make` in test/, and `sh run_tests.sh`
-
 ### Compile brpc with cmake
 ```shell
 $ mkdir build && cd build && cmake .. && make
@@ -323,9 +328,6 @@ $ ./echo_client
 Examples link brpc statically, if you need to link the shared version, use `cmake -DEXAMPLE_LINK_SO=ON ..`
 
 **Run tests**
-
-Install gtest like just written above.
-
 ```shell
 $ mkdir build && cd build && cmake -DBUILD_UNIT_TESTS=ON .. && make
 $ cd test && sh run_tests.sh