Improve documentation for testing post api and tests

Author: adfoster-r7

docs/metasploit-framework.wiki/Loading-Test-Modules.md

@@ -1,4 +1,8 @@
-By default test modules in Metasploit are not loaded when Metasploit starts. To load them, run `loadpath test/modules` after which you should see output similar to the following:
+Metasploit offers inbuilt test modules which can be used for verifying Metasploit's post-exploitations work with currently opened sessions.
+These modules are intended to be used by developers to test updates to ensure they don't break core functionality
+and should not be used during normal operations. These modules also as part of the automated test suite within pull requests.
+
+By default the test modules in Metasploit are not loaded when Metasploit starts. To load them, run `loadpath test/modules` after which you should see output similar to the following:
 
 ```msf
 msf6 > loadpath test/modules
@@ -9,4 +13,69 @@ Loaded 38 modules:
 msf6 > 
 ```
 
-These modules are intended to be used by developers to test updates to ensure they don't break core functionality and should not be used during normal operations. If you do happen to break the functionality of one of these modules, it is highly recommended that you look at what you are proposing within your PR and ensure that you are not accidentally breaking unintended functionality. If you do need to break certain functionality in order to add a given feature, and there is no other way to go around this, be sure to let one of the Metasploit team members know this so that appropriate updates can be made to these scripts and any associated code that may be updated by your change (assuming it is has been signed off and approved by the team).
+The modules can be searched for:
+
+```msf
+msf6 > search post/test
+
+Matching Modules
+================
+
+   #   Name                               Disclosure Date  Rank    Check  Description
+   -   ----                               ---------------  ----    -----  -----------
+   0   post/test/cmd_exec                 .                normal  No     Meterpreter cmd_exec test
+   1   post/test/railgun                  .                normal  No     Railgun API Tests
+   2   post/test/extapi                   .                normal  No     Test Meterpreter ExtAPI Stuff
+   3   post/test/get_env                  .                normal  No     Test Post::Common Get Envs
+   4   post/test/services                 .                normal  No     Test Post::Windows::Services
+   5   post/test/all                      .                normal  No     Test all applicable post modules
+... etc etc ...
+```
+
+Example of running the test module against an opened session:
+
+```
+msf6 > use post/test/cmd_exec
+msf6 post(test/cmd_exec) > run session=-1
+...
+[*] Testing complete in 2.04 seconds
+[*] Passed: 6; Failed: 0; Skipped: 0
+[*] Post module execution completed
+```
+
+The `post/test/all` module is an aggregate module that can be used to quickly run all of the applicable test modules
+against a currently open session:
+
+```msf
+msf6 post(test/all) > run session=-1
+
+[*] Applicable modules:
+Valid modules for x86/windows session 1
+=======================================
+
+ #   Name                          is_session_platform  is_session_type
+ -   ----                          -------------------  ---------------
+ 0   test/railgun_reverse_lookups  Yes                  Yes
+ 1   test/search                   Yes                  Yes
+ 2   test/services                 Yes                  Yes
+ 3   test/meterpreter              Yes                  Yes
+ 4   test/cmd_exec                 Yes                  Yes
+ 5   test/extapi                   Yes                  Yes
+ 6   test/file                     Yes                  Yes
+ 7   test/get_env                  Yes                  Yes
+ 8   test/railgun                  Yes                  Yes
+ 9   test/registry                 Yes                  Yes
+ 10  test/unix                     No                   Yes
+ 11  test/mssql                    Yes                  No
+ 12  test/mysql                    Yes                  No
+ 13  test/postgres                 Yes                  No
+ 14  test/smb                      Yes                  No
+
+[*] Running test/cmd_exec against session -1
+[*] --------------------------------------------------------------------------------
+... etc etc ...
+
+[*] Running test/extapi against session -1
+[*] --------------------------------------------------------------------------------
+... etc etc ...
+```