Add "quick" guide for how to execute tests

Author: aedart

docs/+current/modules/testing/cmake/04_run_tests.md

@@ -7,4 +7,43 @@ author: RSP Systems A/S
 
 # Run Tests
 
-_TODO: ..._
+To run test tests, you must first ensure that you build your CMake project. Once you have done so, use the
+[ctest executable](https://cmake.org/cmake/help/latest/manual/ctest.1.html) to execute the tests.
+
+```sh
+ctest --output-on-failure --test-dir <your-build-directory>/tests
+```
+
+## Run Specific Tests
+
+To run only certain tests, use the `--label-regex` option.
+
+```sh
+ctest --output-on-failure \
+  --label-regex "unit" \
+  --test-dir <your-build-directory>/tests
+```
+
+For additional information, see "labels" section in [test suites](./01_test_suite.md#labels) and
+[test cases](./02_test_case.md#labels).
+
+## Run Parallel
+
+To run tests in parallel, use the `--parallel` option.
+
+```sh
+ctest --output-on-failure --parallel --test-dir <your-build-directory>/tests
+```
+
+## Run Failed
+
+To (re)run tests that have failed, use the `--rerun-failed` option.
+
+```sh
+ctest --rerun-failed --test-dir <your-build-directory>/tests
+```
+
+## Onward
+
+For additional command line arguments and options, please review the official documentation for the
+[ctest executable]().