diff --git a/Core/src/test/java/FileTest.java b/Core/src/test/java/FileTest.java
new file mode 100644
index 0000000..e338b82
--- /dev/null
+++ b/Core/src/test/java/FileTest.java
@@ -0,0 +1,13 @@
+import me.zacharias.chat.core.files.FileHandler;
+import me.zacharias.chat.core.files.FileHandlerException;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class FileTest {
+    @Test
+    void TestError()
+    {
+        FileHandler fileHandler = new FileHandler("./test/files");
+        Assertions.assertThrowsExactly(FileHandlerException.class, () -> fileHandler.readFile("../build.gradle"));
+    }
+}
diff --git a/build.gradle b/build.gradle
index da829b0..37ee291 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,6 +21,12 @@ subprojects {
         implementation("org.json:json:20250107")
         implementation("com.github.docker-java:docker-java:3.4.1")
         implementation("org.jetbrains:annotations:23.1.0")
+
+        testImplementation 'org.junit.jupiter:junit-jupiter:5.10.0'
+    }
+
+    test {
+        useJUnitPlatform()
     }
 
     task sourcesJar(type: Jar, dependsOn: classes) {