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Document concurrency considerations for TestExecutionListener implementations #3053

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Oct 10, 2022
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Document concurrency considerations for TestExecutionListener implementations #3053

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10 changes: 10 additions & 0 deletions junit-platform-launcher/src/main/java/org/junit/platform/launcher/TestExecutionListener.java
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,12 @@
* {@link #testPlanExecutionStarted(TestPlan)} and
* {@link #testPlanExecutionFinished(TestPlan)}.
*
* <p>Note on concurrency: {@link #testPlanExecutionStarted(TestPlan)} and
* {@link #testPlanExecutionFinished(TestPlan)} are always called from the same
* thread. It is safe to assume that there is at most one {@code TestPlan}
* instance at a time. All other methods could be called from different threads
* concurrently in case one or multiple test engines execute tests in parallel.
*
* @since 1.0
* @see Launcher
* @see TestPlan
Expand All @@ -58,6 +64,8 @@ public interface TestExecutionListener {
* Called when the execution of the {@link TestPlan} has started,
* <em>before</em> any test has been executed.
*
* <p>Called from the same thread as {@link #testPlanExecutionFinished(TestPlan)}.
*
* @param testPlan describes the tree of tests about to be executed
*/
default void testPlanExecutionStarted(TestPlan testPlan) {
Expand All @@ -67,6 +75,8 @@ default void testPlanExecutionStarted(TestPlan testPlan) {
* Called when the execution of the {@link TestPlan} has finished,
* <em>after</em> all tests have been executed.
*
* <p>Called from the same thread as {@link #testPlanExecutionStarted(TestPlan)}.
*
* @param testPlan describes the tree of tests that have been executed
*/
default void testPlanExecutionFinished(TestPlan testPlan) {
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