From 73391ebd782453461a7160370b33760efb27b197 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Kautler?= <Bjoern@Kautler.net>
Date: Tue, 9 May 2023 21:04:19 +0200
Subject: [PATCH] Make the test unit finder thread-safe

---
 src/main/java/org/pitest/junit5/JUnit5TestUnitFinder.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/pitest/junit5/JUnit5TestUnitFinder.java b/src/main/java/org/pitest/junit5/JUnit5TestUnitFinder.java
index daa55fe..8d9b79f 100755
--- a/src/main/java/org/pitest/junit5/JUnit5TestUnitFinder.java
+++ b/src/main/java/org/pitest/junit5/JUnit5TestUnitFinder.java
@@ -19,6 +19,7 @@
 import java.util.List;
 
 import static java.util.Collections.emptyList;
+import static java.util.Collections.synchronizedList;
 import static java.util.Collections.unmodifiableList;
 import static java.util.stream.Collectors.toList;
 
@@ -95,7 +96,7 @@ public List<TestUnit> findTestUnits(Class<?> clazz, TestUnitExecutionListener ex
     private class TestIdentifierListener implements TestExecutionListener {
         private final Class<?> testClass;
         private final TestUnitExecutionListener l;
-        private final List<TestIdentifier> identifiers = new ArrayList<>();
+        private final List<TestIdentifier> identifiers = synchronizedList(new ArrayList<>());
 
         public TestIdentifierListener(Class<?> testClass, TestUnitExecutionListener l) {
             this.testClass = testClass;
@@ -103,7 +104,7 @@ public TestIdentifierListener(Class<?> testClass, TestUnitExecutionListener l) {
         }
 
         List<TestIdentifier> getIdentifiers() {
-            return unmodifiableList(identifiers);
+            return unmodifiableList(new ArrayList<>(identifiers));
         }
 
         @Override