From d928abe03328a971c6af09db70fa32a8aab89b7c Mon Sep 17 00:00:00 2001
From: "thibault.faure" <thibault.faure@mimacom.com>
Date: Tue, 6 Jun 2023 23:00:55 +0200
Subject: [PATCH] BAEL-6482 Code for the Matching Null With Mockito article

---
 .../java/com/baeldung/nullmatcher/Helper.java |  9 +++++
 .../java/com/baeldung/nullmatcher/Main.java   | 11 +++++
 .../baeldung/nullmatcher/MainUnitTest.java    | 40 +++++++++++++++++++
 3 files changed, 60 insertions(+)
 create mode 100644 testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Helper.java
 create mode 100644 testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Main.java
 create mode 100644 testing-modules/mockito-2/src/test/java/com/baeldung/nullmatcher/MainUnitTest.java

diff --git a/testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Helper.java b/testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Helper.java
new file mode 100644
index 0000000000..d15196faa5
--- /dev/null
+++ b/testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Helper.java
@@ -0,0 +1,9 @@
+package com.baeldung.nullmatcher;
+
+class Helper {
+
+    String concat(String a, String b) {
+        return a + b;
+    }
+
+}
diff --git a/testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Main.java b/testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Main.java
new file mode 100644
index 0000000000..e3c73f9d8a
--- /dev/null
+++ b/testing-modules/mockito-2/src/main/java/com/baeldung/nullmatcher/Main.java
@@ -0,0 +1,11 @@
+package com.baeldung.nullmatcher;
+
+class Main {
+
+    Helper helper = new Helper();
+
+    String methodUnderTest() {
+        return helper.concat("Baeldung", null);
+    }
+
+}
diff --git a/testing-modules/mockito-2/src/test/java/com/baeldung/nullmatcher/MainUnitTest.java b/testing-modules/mockito-2/src/test/java/com/baeldung/nullmatcher/MainUnitTest.java
new file mode 100644
index 0000000000..a0245977e0
--- /dev/null
+++ b/testing-modules/mockito-2/src/test/java/com/baeldung/nullmatcher/MainUnitTest.java
@@ -0,0 +1,40 @@
+package com.baeldung.nullmatcher;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.isNull;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+
+class MainUnitTest {
+
+    @Mock
+    Helper helper;
+
+    @InjectMocks
+    Main main;
+
+    @BeforeEach
+    void openMocks() {
+        MockitoAnnotations.openMocks(this);
+    }
+
+    @Test
+    void whenMethodUnderTest_thenSecondParameterNull() {
+        main.methodUnderTest();
+        Mockito.verify(helper)
+          .concat("Baeldung", null);
+    }
+
+    @Test
+    void whenMethodUnderTest_thenSecondParameterNullWithMatchers() {
+        main.methodUnderTest();
+        Mockito.verify(helper)
+          .concat(any(), isNull());
+    }
+
+}