From 9bb33102f97badd68ffcba5b17cf4cc7087e80d3 Mon Sep 17 00:00:00 2001
From: Kartik Singla <singla.kartik1@gmail.com>
Date: Sat, 18 Aug 2018 11:10:55 +0530
Subject: [PATCH] [BAEL-1858] - How to mock a static method using JMockit
 (#4925)

---
 .../baeldung/mocks/jmockit/AppManager.java    | 26 +++++++++++
 .../mocks/jmockit/AppManagerUnitTest.java     | 44 +++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 testing-modules/mocks/jmockit/src/main/java/com/baeldung/mocks/jmockit/AppManager.java
 create mode 100644 testing-modules/mocks/jmockit/src/test/java/com/baeldung/mocks/jmockit/AppManagerUnitTest.java

diff --git a/testing-modules/mocks/jmockit/src/main/java/com/baeldung/mocks/jmockit/AppManager.java b/testing-modules/mocks/jmockit/src/main/java/com/baeldung/mocks/jmockit/AppManager.java
new file mode 100644
index 0000000000..615650ea6d
--- /dev/null
+++ b/testing-modules/mocks/jmockit/src/main/java/com/baeldung/mocks/jmockit/AppManager.java
@@ -0,0 +1,26 @@
+package com.baeldung.mocks.jmockit;
+
+import java.util.Random;
+
+public class AppManager {
+
+    public boolean managerResponse(String question) {
+        return AppManager.isResponsePositive(question);
+    }
+
+    public static boolean isResponsePositive(String value) {
+        if (value == null)
+            return false;
+        int orgLength = value.length();
+        int randomNumber = randomNumber();
+        return orgLength == randomNumber ? true : false;
+    }
+
+    private static int randomNumber() {
+        return new Random().nextInt(7);
+    }
+
+    private static Integer stringToInteger(String num) {
+        return Integer.parseInt(num);
+    }
+}
diff --git a/testing-modules/mocks/jmockit/src/test/java/com/baeldung/mocks/jmockit/AppManagerUnitTest.java b/testing-modules/mocks/jmockit/src/test/java/com/baeldung/mocks/jmockit/AppManagerUnitTest.java
new file mode 100644
index 0000000000..2c5aa2a3ed
--- /dev/null
+++ b/testing-modules/mocks/jmockit/src/test/java/com/baeldung/mocks/jmockit/AppManagerUnitTest.java
@@ -0,0 +1,44 @@
+package com.baeldung.mocks.jmockit;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import mockit.Deencapsulation;
+import mockit.Mock;
+import mockit.MockUp;
+
+public class AppManagerUnitTest {
+
+    private AppManager appManager;
+
+    @BeforeEach
+    public void setUp() {
+        appManager = new AppManager();
+    }
+
+    @Test
+    public void givenAppManager_whenStaticMethodCalled_thenValidateExpectedResponse() {
+        new MockUp<AppManager>() {
+            @Mock
+            public boolean isResponsePositive(String value) {
+                return false;
+            }
+        };
+
+        Assertions.assertFalse(appManager.managerResponse("Why are you coming late?"));
+    }
+
+    @Test
+    public void givenAppManager_whenPrivateStaticMethod_thenValidateExpectedResponse() {
+        final int response = Deencapsulation.invoke(AppManager.class, "stringToInteger", "110");
+        Assertions.assertEquals(110, response);
+    }
+
+    @Test
+    public void givenAppManager_whenPrivateStaticMethod_thenExpectException() {
+        Assertions.assertThrows(IllegalArgumentException.class, () -> {
+            Deencapsulation.invoke(AppManager.class, "stringToInteger", "11r");
+        });
+    }
+}