From e0ec40969845505e2c3187db133cda39f8406403 Mon Sep 17 00:00:00 2001
From: Andrea Ligios <andrea.ligios@gmail.com>
Date: Sun, 9 Sep 2018 20:13:53 +0200
Subject: [PATCH] BAEL-2092 (#5211)

---
 .../com/baeldung/lombok/builder/Child.java    | 19 ++++++
 .../com/baeldung/lombok/builder/Parent.java   | 11 ++++
 .../lombok/builder/BuilderUnitTest.java       | 61 ++++++++++++-------
 3 files changed, 69 insertions(+), 22 deletions(-)
 create mode 100644 lombok/src/main/java/com/baeldung/lombok/builder/Child.java
 create mode 100644 lombok/src/main/java/com/baeldung/lombok/builder/Parent.java

diff --git a/lombok/src/main/java/com/baeldung/lombok/builder/Child.java b/lombok/src/main/java/com/baeldung/lombok/builder/Child.java
new file mode 100644
index 0000000000..70f6d9c46e
--- /dev/null
+++ b/lombok/src/main/java/com/baeldung/lombok/builder/Child.java
@@ -0,0 +1,19 @@
+package com.baeldung.lombok.builder;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+public class Child extends Parent {
+
+    private final String childName;
+    private final int childAge;
+
+    @Builder(builderMethodName = "childBuilder")
+    public Child(String parentName, int parentAge, String childName, int childAge) {
+        super(parentName, parentAge);
+        this.childName = childName;
+        this.childAge = childAge;
+    }
+
+}
diff --git a/lombok/src/main/java/com/baeldung/lombok/builder/Parent.java b/lombok/src/main/java/com/baeldung/lombok/builder/Parent.java
new file mode 100644
index 0000000000..0cf76d4b00
--- /dev/null
+++ b/lombok/src/main/java/com/baeldung/lombok/builder/Parent.java
@@ -0,0 +1,11 @@
+package com.baeldung.lombok.builder;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public class Parent {    
+    private final String parentName;
+    private final int parentAge;
+}
\ No newline at end of file
diff --git a/lombok/src/test/java/com/baeldung/lombok/builder/BuilderUnitTest.java b/lombok/src/test/java/com/baeldung/lombok/builder/BuilderUnitTest.java
index acad7d6c04..56a380569d 100644
--- a/lombok/src/test/java/com/baeldung/lombok/builder/BuilderUnitTest.java
+++ b/lombok/src/test/java/com/baeldung/lombok/builder/BuilderUnitTest.java
@@ -1,42 +1,59 @@
 package com.baeldung.lombok.builder;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 import org.junit.jupiter.api.Test;
 
-import static org.assertj.core.api.Assertions.*;
-
-public class BuilderUnitTest
-{
+public class BuilderUnitTest {
 
     @Test
     public void givenBuilder_WidgetIsBuilt() {
-        Widget testWidget = Widget.builder().name("foo").id(1).build();
-        assertThat(testWidget.getName())
-                .isEqualTo("foo");
-        assertThat(testWidget.getId())
-                .isEqualTo(1);
+        Widget testWidget = Widget.builder()
+            .name("foo")
+            .id(1)
+            .build();
+        assertThat(testWidget.getName()).isEqualTo("foo");
+        assertThat(testWidget.getId()).isEqualTo(1);
     }
 
     @Test
     public void givenToBuilder_whenToBuilder_BuilderIsCreated() {
 
-        Widget testWidget = Widget.builder().name("foo").id(1).build();
+        Widget testWidget = Widget.builder()
+            .name("foo")
+            .id(1)
+            .build();
         Widget.WidgetBuilder widgetBuilder = testWidget.toBuilder();
 
-        Widget newWidget = widgetBuilder.id(2).build();
-        assertThat(newWidget.getName())
-                .isEqualTo("foo");
-        assertThat(newWidget.getId())
-                .isEqualTo(2);
+        Widget newWidget = widgetBuilder.id(2)
+            .build();
+        assertThat(newWidget.getName()).isEqualTo("foo");
+        assertThat(newWidget.getId()).isEqualTo(2);
     }
 
-
-
     @Test
     public void givenBuilderMethod_ClientIsBuilt() {
-        ImmutableClient testImmutableClient = ClientBuilder.builder().name("foo").id(1).build();
-        assertThat(testImmutableClient.getName())
-            .isEqualTo("foo");
-        assertThat(testImmutableClient.getId())
-            .isEqualTo(1);
+        ImmutableClient testImmutableClient = ClientBuilder.builder()
+            .name("foo")
+            .id(1)
+            .build();
+        assertThat(testImmutableClient.getName()).isEqualTo("foo");
+        assertThat(testImmutableClient.getId()).isEqualTo(1);
     }
+
+    @Test
+    public void givenBuilderAtMethodLevel_ChildInheritingParentIsBuilt() {
+        Child child = Child.childBuilder()
+            .parentName("Andrea")
+            .parentAge(38)
+            .childName("Emma")
+            .childAge(6)
+            .build();
+
+        assertThat(child.getChildName()).isEqualTo("Emma");
+        assertThat(child.getChildAge()).isEqualTo(6);
+        assertThat(child.getParentName()).isEqualTo("Andrea");
+        assertThat(child.getParentAge()).isEqualTo(38);
+    }
+
 }