diff --git a/TODO.md b/TODO.md
index 5768390..bae6b82 100644
--- a/TODO.md
+++ b/TODO.md
@@ -6,7 +6,7 @@
 | MET-002 |   Done   | Set Gradle project metadata and configure a Java toolchain compatible with the target modern Paper version. |
 | MET-003 |   Done   | Configure repositories and compatible PaperMC, WorldEdit, WorldGuard, and other required or optional dependencies; add build plugins such as Shadow only if needed. |
 | MET-004 |   Done   | Move or verify plugin.yml under src/main/resources, configure Gradle resource processing, and update its Paper api-version, dependencies, commands, permissions, and required fields. |
-| MET-005 |   Ready  | Add JUnit 5 test infrastructure and keep the default Gradle `test` task server-free. Use an in-memory Paper harness such as MockBukkit for Bukkit/Paper behavior and mocks or test doubles for WorldEdit, WorldGuard, and narrow API boundaries where appropriate. |
+| MET-005 |   Done   | Add JUnit 5 test infrastructure and keep the default Gradle `test` task server-free. Use an in-memory Paper harness such as MockBukkit for Bukkit/Paper behavior and mocks or test doubles for WorldEdit, WorldGuard, and narrow API boundaries where appropriate. |
 | MET-006 |   Ready  | Build the initial Gradle project and run its tests; resolve build setup issues before removing the existing Maven build. |
 | MET-007 |   Ready  | Update .gitignore for Gradle and remove obsolete Maven and Eclipse project files after the Gradle build succeeds. |
 | MET-008 |   Ready  | Analyze Java sources for deprecated or removed Bukkit/Paper APIs and legacy patterns, including logging, event registration, configuration, player lookup, and player-keyed storage. |
diff --git a/build.gradle b/build.gradle
index 62f324e..f48ebef 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,6 +18,9 @@ dependencies {
     compileOnly 'io.papermc.paper:paper-api:26.2.build.129-stable'
     compileOnly 'com.sk89q.worldedit:worldedit-bukkit:7.4.5'
     compileOnly 'com.sk89q.worldguard:worldguard-bukkit:7.0.19'
+
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.13.4'
+    testImplementation 'org.mockito:mockito-junit-jupiter:5.24.0'
 }
 
 java {
@@ -43,6 +46,10 @@ tasks.named('processResources') {
     }
 }
 
+tasks.named('test') {
+    useJUnitPlatform()
+}
+
 tasks.named('wrapper') {
     gradleVersion = '9.8.0'
     distributionType = Wrapper.DistributionType.BIN