What is the difference between runBlocking, runBlockingTest, and runTest?

• runBlocking: A blocking function that launches a new coroutine and waits for its completion. Mainly used in tests or in main functions where blocking is necessary. Not suitable for production code in UI threads.
• runBlockingTest (from kotlinx-coroutines-test before version 1.6): A blocking function optimized for testing. Uses TestCoroutineDispatcher by default, allowing control over time and immediate execution of delayed tasks.
• runTest (from kotlinx-coroutines-test from version 1.6): A non-blocking function designed to replace runBlockingTest. Uses TestDispatcher. Allows more flexible testing of scenarios with delays and parallel tasks, automatically advancing time.

Main differences:

Feature	runBlocking	runBlockingTest (deprecated)	runTest
Thread blocking	Yes	Yes	No (within tests)
Time control	No (uses system time)	Yes (via TestCoroutineDispatcher)	Yes (via TestDispatcher)
Usage in tests	Possible but not optimized	Main purpose	Main purpose
kotlinx-coroutines-test version	Not part of the testing library	Up to 1.6	1.6+
Replacement	No	runTest	No