handle top-level nested test classes

README.MD

@@ -86,7 +86,7 @@ Simply include the maven dependency (from central maven) to start using @MockInB
 <dependency>
   <groupId>com.teketik</groupId>
   <artifactId>mock-in-bean</artifactId>
-  <version>boot2-v1.5.1</version>
+  <version>boot2-v1.5.2</version>
   <scope>test</scope>
 </dependency>
 ```

src/main/java/com/teketik/test/mockinbean/MockInBeanTestExecutionListener.java

@@ -93,9 +93,6 @@ public void beforeTestClass(TestContext testContext) throws Exception {
     public void beforeTestMethod(TestContext testContext) throws Exception {
         final TestContext applicableTestContext = ROOT_TEST_CONTEXT_TRACKER
                 .get(resolveTestClass(testContext.getTestClass()));
-        if(applicableTestContext == null) {
-            return; // required to handle nested spring integration test classes that do not have any @MockInBean declarations
-        }
         final Map<Definition, Object> mockOrSpys = new HashMap<>();
         ((LinkedList<FieldState>) applicableTestContext.getAttribute(ORIGINAL_VALUES_ATTRIBUTE_NAME))
             .forEach(fieldState -> {
@@ -151,7 +148,8 @@ private Class<?> resolveTestClass(Class<?> candidate) {
     }
 
     private boolean isNestedTestClass(Class<?> candidate) {
-        return AnnotationUtils.isAnnotationDeclaredLocally(Nested.class, candidate);
+        return AnnotationUtils.isAnnotationDeclaredLocally(Nested.class, candidate)
+                && candidate.getEnclosingClass() != null;
     }
 
 }

src/test/java/com/teketik/test/mockinbean/test/NestedTopLevelTest.java

@@ -0,0 +1,13 @@
+package com.teketik.test.mockinbean.test;
+
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+@Nested
+class NestedTopLevelTest extends BaseTest {
+
+    @Test
+    public void test() {
+    }
+
+}