Kapt: add some JeElement tests

(cherry picked from commit 948a4b6)

plugins/annotation-processing/testData/javaWrappers/EnumClass/EnumClass.java

@@ -0,0 +1,13 @@
+// EnumClass
+
+enum EnumClass {
+    RED, GREEN, BLUE;
+    
+    void someMethod() {
+        System.out.println("Hello, world!")
+    }
+    
+    String getStringRepresentation() {
+        return this.toString();
+    }
+}