unify testing docs for all platforms

docs/development/build-instructions-linux.md

@@ -121,17 +121,7 @@ $ sudo ln -s /usr/lib/libncurses.so.5 /usr/lib/libtinfo.so.5
 
 ## Tests
 
-Test your changes conform to the project coding style using:
+See [Build System Overview: Tests](docs/development/build-system-overview.md#tests)
-
-```bash
-$ npm run lint
-```
-
-Test functionality using:
-
-```bash
-$ ./script/test.py
-```
 
 ## Advanced topics
 

docs/development/build-instructions-osx.md

@@ -61,31 +61,4 @@ $ npm run clean
 
 ## Tests
 
-Test your changes conform to the project coding style using:
+See [Build System Overview: Tests](docs/development/build-system-overview.md#tests)
-
-```bash
-$ npm run lint
-```
-
-Test functionality using:
-
-```bash
-$ npm test
-```
-
-You can make the test suite run faster by isolating the specific test or block
-you're currently working on using Mocha's
-[exclusive tests](https://mochajs.org/#exclusive-tests) feature:
-
-```js
-describe.only('some feature', function () {
-  // ... only tests in this block will be run
-})
-```
-
-Alternatively, you can use mocha's `grep` option to only run tests matching the
-given regular expression pattern:
-
-```sh
-npm test -- --grep child_process
-```

docs/development/build-instructions-windows.md

@@ -87,27 +87,7 @@ $ npm run clean
 
 ## Tests
 
-Test your changes conform to the project coding style using:
+See [Build System Overview: Tests](docs/development/build-system-overview.md#tests)
-
-```powershell
-$ python script\cpplint.py
-```
-
-Test functionality using:
-
-```powershell
-$ python script\test.py
-```
-
-Tests that include native modules (e.g. `runas`) can't be executed with the
-debug build (see [#2558](https://github.com/electron/electron/issues/2558) for
-details), but they will work with the release build.
-
-To run the tests with the release build use:
-
-```powershell
-$ python script\test.py -R
-```
 
 ## Troubleshooting
 

docs/development/build-system-overview.md

@@ -71,3 +71,44 @@ to generate one target at a time as stated above.
 
 This only affects developers, if you are just building Electron for rebranding
 you are not affected.
+
+## Tests
+
+Test your changes conform to the project coding style using:
+
+```bash
+$ npm run lint
+```
+
+Test functionality using:
+
+```bash
+$ npm test
+```
+
+You can make the test suite run faster by isolating the specific test or block
+you're currently working on using Mocha's
+[exclusive tests](https://mochajs.org/#exclusive-tests) feature:
+
+```js
+describe.only('some feature', function () {
+  // ... only tests in this block will be run
+})
+```
+
+Alternatively, you can use mocha's `grep` option to only run tests matching the
+given regular expression pattern:
+
+```sh
+$ npm test -- --grep child_process
+```
+
+Tests that include native modules (e.g. `runas`) can't be executed with the
+debug build (see [#2558](https://github.com/electron/electron/issues/2558) for
+details), but they will work with the release build.
+
+To run the tests with the release build use:
+
+```bash
+$ npm test -- -R
+```