BAEL-7240 Add example code for verifying lambda calls with mockito

testing-modules/mockito-2/src/main/java/com/baeldung/lambdacalls/LambdaExample.java

@@ -0,0 +1,26 @@
+package com.baeldung.lambdacalls;
+
+import java.util.ArrayList;
+
+public class LambdaExample {
+
+    private BrickLayer brickLayer = new BrickLayer();
+
+    static ArrayList<String> bricksList = new ArrayList<>();
+
+    public void createWall(String bricks){
+        Runnable build = () -> brickLayer.layBricks(bricks);
+        build.run();
+    }
+
+    public ArrayList<String> getBricksList(){
+        return bricksList;
+    }
+
+    static class BrickLayer {
+        void layBricks(String bricks){
+            bricksList.add(bricks);
+        }
+    }
+
+}