Test changes

- configure mockito agent to address changes in newer java versions see https://openjdk.org/jeps/451

Co-authored-by: yannnicklamprecht <yannicklamprecht@live.de>

paper-server/src/test/java/io/papermc/paper/registry/RegistryKeyTest.java

@@ -0,0 +1,34 @@
+package io.papermc.paper.registry;
+
+import java.util.Optional;
+import java.util.stream.Stream;
+import net.minecraft.core.Registry;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import org.bukkit.support.AbstractTestingBase;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@AllFeatures
+class RegistryKeyTest {
+
+    @BeforeAll
+    static void before() throws ClassNotFoundException {
+        Class.forName(RegistryKey.class.getName()); // load all keys so they are found for the test
+    }
+
+    static Stream<RegistryKey<?>> data() {
+        return RegistryKeyImpl.REGISTRY_KEYS.stream();
+    }
+
+    @ParameterizedTest
+    @MethodSource("data")
+    void testApiRegistryKeysExist(final RegistryKey<?> key) {
+        final Optional<Registry<Object>> registry = RegistryHelper.getRegistry().lookup(ResourceKey.createRegistryKey(ResourceLocation.parse(key.key().asString())));
+        assertTrue(registry.isPresent(), "Missing vanilla registry for " + key.key().asString());
+
+    }
+}