Bug showcase: testng-team/testng#3000

pom.xml

@@ -26,11 +26,11 @@
             <artifactId>slf4j-api</artifactId>
             <version>2.0.7</version>
         </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-simple</artifactId>
-            <version>2.0.7</version>
-        </dependency>
+<!--        <dependency>-->
+<!--            <groupId>org.slf4j</groupId>-->
+<!--            <artifactId>slf4j-simple</artifactId>-->
+<!--            <version>2.0.7</version>-->
+<!--        </dependency>-->
     </dependencies>
 
     <build>

src/main/java/com/example/MyTest.java

@@ -0,0 +1,43 @@
+package com.example; // 1. to make test PASS: change to `org.example`
+
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.assertNotNull;
+
+public class MyTest extends MyBaseTest {
+
+    @BeforeClass
+    public void beforeClass() {
+        assertNotNull(dependency); // fails here
+    }
+
+    @Test
+    public void test() {
+    }
+}
+
+abstract class MyBaseTest implements MyInterface { // 2. to make test PASS: remove `implements MyInterface`
+    protected Object dependency;
+
+    public void setDependency(Object dependency) {
+    }
+
+    @BeforeClass
+    public void setupDependency() {
+        dependency = new Object();
+    }
+
+    @BeforeClass(dependsOnMethods = "setupDependency")
+    public void setupAdditionalDependency_() {  // 3. to make test PASS: remove `_` from the method name
+    }
+}
+
+interface MyInterface {
+
+    void setDependency(Object dependency);
+
+    default Object getDependency() {
+        return null;
+    }
+}