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+# TestRunnerApi
+The `TestRunnerApi` retrieves and runs tests programmatically from code inside the project, or inside other packages. `TestRunnerApi` is a [ScriptableObject](https://docs.unity3d.com/ScriptReference/ScriptableObject.html). 
+
+You can initialize the API like this:
+
+```c#
+var testRunnerApi = ScriptableObject.CreateInstance<TestRunnerApi>();
+```
+> **Note**: You can subscribe and receive test results in one instance of the API, even if the run starts from another instance.
+
+The `TestRunnerApi` supports the following workflows:
+* [How to run tests programmatically](./extension-run-tests.md)
+* [How to get test results](./extension-get-test-results.md)
+* [How to retrieve the list of tests](./extension-retrieve-test-list.md)
+
+## Public methods
+
+| Syntax                                     | Description                                                  |
+| ------------------------------------------ | ------------------------------------------------------------ |
+| `void Execute(ExecutionSettings executionSettings)` | Starts a test run with a given set of [ExecutionSettings](./reference-execution-settings.md). |
+| `void RegisterCallbacks(ICallbacks testCallbacks, int priority = 0)` | Sets up a given instance of [ICallbacks](./reference-icallbacks.md) to be invoked on test runs. |
+| `void UnregisterCallbacks(ICallbacks testCallbacks)` | Unregisters an instance of ICallbacks to no longer receive callbacks from test runs. |
+| `void RetrieveTestList(TestMode testMode, Action<ITestAdaptor> callback)` | Retrieve the full test tree as [ITestAdaptor](./reference-itest-adaptor.md) for a given test mode. |