New unit test format

testing-modules/mocks/mock-comparisons/README.md

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+=========
+
+## Mock comparison realated tutorials
+
+
+### Relevant Articles: 
+- [Mockito vs EasyMock vs JMockit](http://www.baeldung.com/mockito-vs-easymock-vs-jmockit)
+- [Introduction to EasyMock](http://www.baeldung.com/easymock)

testing-modules/mocks/mock-comparisons/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>mock-comparisons</artifactId>
+    <name>mock-comparisons</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>mocks</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.easymock</groupId>
+            <artifactId>easymock</artifactId>
+            <version>${easymock.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.jmockit</groupId>
+            <artifactId>jmockit</artifactId>
+            <version>${jmockit.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <finalName>mock-comparisons</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <mockito.version>2.21.0</mockito.version>
+        <easymock.version>3.5.1</easymock.version>
+        <jmockit.version>1.41</jmockit.version>
+    </properties>
+
+</project>

testing-modules/mocks/mock-comparisons/src/main/java/com/baeldung/easymock/ArticleReader.java

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+package com.baeldung.easymock;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import static java.util.stream.Collectors.toList;
+
+public class ArticleReader {
+
+    private List<BaeldungArticle> articles;
+    private Iterator<BaeldungArticle> articleIter;
+
+    public ArticleReader() {
+        this(new ArrayList<>());
+    }
+
+    public ArticleReader(List<BaeldungArticle> articles) {
+        this.articles = articles;
+        this.articleIter = this.articles.iterator();
+    }
+
+    public List<BaeldungArticle> ofTopic(String topic) {
+        return articles
+          .stream()
+          .filter(article -> article
+            .title()
+            .contains(topic))
+          .collect(toList());
+    }
+
+    public BaeldungArticle next() {
+        return this.articleIter.next();
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/main/java/com/baeldung/easymock/BaeldungArticle.java

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+package com.baeldung.easymock;
+
+public class BaeldungArticle {
+
+    public static BaeldungArticle simpleArticle(String title, String content) {
+        return new BaeldungArticle(title, content);
+    }
+
+    private String title;
+    private String content;
+
+    private BaeldungArticle(String title, String content) {
+        this.title = title;
+        this.content = content;
+    }
+
+    public String title() {
+        return this.title;
+    }
+
+    public String content() {
+        return this.content;
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/main/java/com/baeldung/easymock/BaeldungReader.java

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+package com.baeldung.easymock;
+
+import java.util.List;
+
+public class BaeldungReader {
+
+    private ArticleReader articleReader;
+    private IArticleWriter articleWriter;
+
+    public BaeldungReader() {
+    }
+
+    ;
+
+    public BaeldungReader(ArticleReader articleReader) {
+        this.articleReader = articleReader;
+    }
+
+    public BaeldungReader(IArticleWriter writer) {
+        this.articleWriter = writer;
+    }
+
+    public BaeldungReader(ArticleReader articleReader, IArticleWriter writer) {
+        this.articleReader = articleReader;
+        this.articleWriter = writer;
+    }
+
+    public BaeldungArticle readNext() {
+        return articleReader.next();
+    }
+
+    public List<BaeldungArticle> readTopic(String topic) {
+        return articleReader.ofTopic(topic);
+    }
+
+    public String write(String title, String content) {
+        return articleWriter.write(title, content);
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/main/java/com/baeldung/easymock/IArticleWriter.java

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+package com.baeldung.easymock;
+
+public interface IArticleWriter {
+
+    String write(String title, String content);
+
+}

testing-modules/mocks/mock-comparisons/src/main/java/com/baeldung/easymock/IUserService.java

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+package com.baeldung.easymock;
+
+import java.util.List;
+
+public interface IUserService {
+    public boolean addUser(User user);
+    public List<User> findByEmail(String email);    
+    public List<User> findByAge(double age);
+}

testing-modules/mocks/mock-comparisons/src/main/java/com/baeldung/easymock/User.java

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+package com.baeldung.easymock;
+
+public class User {
+    private long id;
+    private String firstName;
+    private String lastName;
+    private double age;
+    private String email;
+    
+    public User() {
+        super();
+    }
+        
+    public User(String firstName, String lastName) {
+        super();
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    //
+    
+    public long getId() {
+        return id;
+    }
+    public void setId(long id) {
+        this.id = id;
+    }
+    public String getFirstName() {
+        return firstName;
+    }
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+    public String getLastName() {
+        return lastName;
+    }
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+    public double getAge() {
+        return age;
+    }
+    public void setAge(double age) {
+        this.age = age;
+    }
+    public String getEmail() {
+        return email;
+    }
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        long temp;
+        temp = Double.doubleToLongBits(age);
+        result = prime * result + (int) (temp ^ (temp >>> 32));
+        result = prime * result + ((email == null) ? 0 : email.hashCode());
+        result = prime * result + ((firstName == null) ? 0 : firstName.hashCode());
+        result = prime * result + (int) (id ^ (id >>> 32));
+        result = prime * result + ((lastName == null) ? 0 : lastName.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        User other = (User) obj;
+        if (Double.doubleToLongBits(age) != Double.doubleToLongBits(other.age)) {
+            return false;
+        }
+        if (email == null) {
+            if (other.email != null) {
+                return false;
+            }
+        } else if (!email.equals(other.email)) {
+            return false;
+        }
+        if (firstName == null) {
+            if (other.firstName != null) {
+                return false;
+            }
+        } else if (!firstName.equals(other.firstName)) {
+            return false;
+        }
+        if (id != other.id) {
+            return false;
+        }
+        if (lastName == null) {
+            if (other.lastName != null) {
+                return false;
+            }
+        } else if (!lastName.equals(other.lastName)) {
+            return false;
+        }
+        return true;
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/main/java/org/baeldung/mocks/testCase/LoginController.java

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+package org.baeldung.mocks.testCase;
+
+public class LoginController {
+
+    public LoginService loginService;
+
+    public String login(UserForm userForm) {
+        if (null == userForm) {
+            return "ERROR";
+        } else {
+            boolean logged;
+
+            try {
+                logged = loginService.login(userForm);
+            } catch (Exception e) {
+                return "ERROR";
+            }
+
+            if (logged) {
+                loginService.setCurrentUser(userForm.getUsername());
+                return "OK";
+            } else {
+                return "KO";
+            }
+        }
+    }
+
+    // standard setters and getters
+}

testing-modules/mocks/mock-comparisons/src/main/java/org/baeldung/mocks/testCase/LoginDao.java

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+package org.baeldung.mocks.testCase;
+
+public class LoginDao {
+
+    public int login(UserForm userForm) {
+        //actual call to a third party library
+        return 0;
+    }
+}

testing-modules/mocks/mock-comparisons/src/main/java/org/baeldung/mocks/testCase/LoginService.java

@@ -0,0 +1,33 @@
+package org.baeldung.mocks.testCase;
+
+public class LoginService {
+
+    private LoginDao loginDao;
+
+    private String currentUser;
+
+    public boolean login(UserForm userForm) {
+        assert null != userForm;
+
+        int loginResults = loginDao.login(userForm);
+
+        switch (loginResults) {
+            case 1:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    public void setCurrentUser(String username) {
+        if (null != username) {
+            this.currentUser = username;
+        }
+    }
+
+    public void setLoginDao(LoginDao loginDao) {
+        this.loginDao = loginDao;
+    }
+
+    // standard setters and getters
+}

testing-modules/mocks/mock-comparisons/src/main/java/org/baeldung/mocks/testCase/UserForm.java

@@ -0,0 +1,15 @@
+package org.baeldung.mocks.testCase;
+
+public class UserForm {
+
+    // public access modifiers as only for testing
+
+    public String password;
+
+    public String username;
+
+    public String getUsername() {
+        return username;
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

testing-modules/mocks/mock-comparisons/src/test/java/com/baeldung/easymock/ArgumentMatchersUnitTest.java

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+package com.baeldung.easymock;
+
+import static org.easymock.EasyMock.and;
+import static org.easymock.EasyMock.anyString;
+import static org.easymock.EasyMock.contains;
+import static org.easymock.EasyMock.endsWith;
+import static org.easymock.EasyMock.eq;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.geq;
+import static org.easymock.EasyMock.gt;
+import static org.easymock.EasyMock.isA;
+import static org.easymock.EasyMock.isNull;
+import static org.easymock.EasyMock.lt;
+import static org.easymock.EasyMock.matches;
+import static org.easymock.EasyMock.mock;
+import static org.easymock.EasyMock.not;
+import static org.easymock.EasyMock.notNull;
+import static org.easymock.EasyMock.replay;
+import static org.easymock.EasyMock.same;
+import static org.easymock.EasyMock.startsWith;
+import static org.easymock.EasyMock.verify;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.easymock.EasyMock;
+import org.easymock.IArgumentMatcher;
+import org.junit.Test;
+
+public class ArgumentMatchersUnitTest {
+
+    private IUserService userService = mock(IUserService.class);
+
+    //====================== equals
+    @Test
+    public void givenUserService_whenAddNewUser_thenOK() {        
+        expect(userService.addUser(eq(new User()))).andReturn(true);
+        replay(userService);
+
+        boolean result = userService.addUser(new User());
+        verify(userService);
+        assertTrue(result);
+    }      
+    
+    //================ same
+    @Test
+    public void givenUserService_whenAddSpecificUser_thenOK() {
+        User user = new User();
+        
+        expect(userService.addUser(same(user))).andReturn(true);
+        replay(userService);
+
+        boolean result = userService.addUser(user);
+        verify(userService);
+        assertTrue(result);
+    } 
+    
+    //============= anyX
+    @Test
+    public void givenUserService_whenSearchForUserByEmail_thenFound() {        
+        expect(userService.findByEmail(anyString())).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByEmail("test@example.com");
+        verify(userService);
+        assertEquals(0,result.size());
+    }    
+    
+    //================= isA
+    @Test
+    public void givenUserService_whenAddUser_thenOK() {        
+        expect(userService.addUser(isA(User.class))).andReturn(true);
+        replay(userService);
+
+        boolean result = userService.addUser(new User());
+        verify(userService);
+        assertTrue(result);
+    }    
+        
+    //=================== null, not null
+    @Test
+    public void givenUserService_whenAddNull_thenFail() {        
+        expect(userService.addUser(isNull())).andReturn(false);
+        replay(userService);
+
+        boolean result = userService.addUser(null);
+        verify(userService);
+        assertFalse(result);
+    }      
+    
+    @Test
+    public void givenUserService_whenAddNotNull_thenOK() {        
+        expect(userService.addUser(notNull())).andReturn(true);
+        replay(userService);
+
+        boolean result = userService.addUser(new User());
+        verify(userService);
+        assertTrue(result);
+    }  
+    
+    // number less,great
+    @Test
+    public void givenUserService_whenSearchForUserByAgeLessThan_thenFound() {        
+        expect(userService.findByAge(lt(100.0))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByAge(20);        
+        verify(userService);
+        assertEquals(0,result.size());
+    }    
+    
+    @Test
+    public void givenUserService_whenSearchForUserByAgeGreaterThan_thenFound() {        
+        expect(userService.findByAge(geq(10.0))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByAge(20);        
+        verify(userService);
+        assertEquals(0,result.size());
+    }    
+    
+    //=============== string 
+    //=============== start
+    @Test
+    public void givenUserService_whenSearchForUserByEmailStartsWith_thenFound() {        
+        expect(userService.findByEmail(startsWith("test"))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByEmail("test@example.com");
+        verify(userService);
+        assertEquals(0,result.size());
+    }
+    
+    //==================end
+    @Test
+    public void givenUserService_whenSearchForUserByEmailEndsWith_thenFound() {        
+        expect(userService.findByEmail(endsWith(".com"))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByEmail("test@example.com");
+        verify(userService);
+        assertEquals(0,result.size());
+    }
+    
+    //=================contain
+    @Test
+    public void givenUserService_whenSearchForUserByEmailContains_thenFound() {        
+        expect(userService.findByEmail(contains("@"))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByEmail("test@example.com");
+        verify(userService);
+        assertEquals(0,result.size());
+    }
+    
+    //==================matches
+    @Test
+    public void givenUserService_whenSearchForUserByEmailMatches_thenFound() {        
+        expect(userService.findByEmail(matches(".+\\@.+\\..+"))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByEmail("test@example.com");
+        verify(userService);
+        assertEquals(0,result.size());
+    }
+    
+    //================== combine and, or, not
+    @Test
+    public void givenUserService_whenSearchForUserByAgeRange_thenFound() {        
+        expect(userService.findByAge(and(gt(10.0),lt(100.0)))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByAge(20);        
+        verify(userService);
+        assertEquals(0,result.size());
+    }        
+    
+    @Test
+    public void givenUserService_whenSearchForUserByEmailNotEndsWith_thenFound() {        
+        expect(userService.findByEmail(not(endsWith(".com")))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByEmail("test@example.org");
+        verify(userService);
+        assertEquals(0,result.size());
+    }    
+    
+    //================ custom matcher
+    
+    @Test
+    public void givenUserService_whenSearchForUserByEmailCharCount_thenFound() {        
+        expect(userService.findByEmail(minCharCount(5))).andReturn(Collections.emptyList());
+        replay(userService);
+
+        List<User> result = userService.findByEmail("test@example.com");
+        verify(userService);
+        assertEquals(0,result.size());
+    }
+    
+    public static String minCharCount(int value){
+        EasyMock.reportMatcher(new IArgumentMatcher() {
+            @Override
+            public boolean matches(Object argument) {
+                return argument instanceof String 
+                  && ((String) argument).length() >= value;
+            }
+     
+            @Override
+            public void appendTo(StringBuffer buffer) {
+                buffer.append("charCount(\"" + value + "\")");
+            }
+        });    
+        return null;
+    }
+}
+
+

testing-modules/mocks/mock-comparisons/src/test/java/com/baeldung/easymock/BaeldungReaderAnnotatedUnitTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.easymock;
+
+import org.easymock.EasyMockRunner;
+import org.easymock.Mock;
+import org.easymock.TestSubject;
+import org.junit.*;
+import org.junit.runner.RunWith;
+
+import java.util.NoSuchElementException;
+
+import static org.easymock.EasyMock.*;
+
+@RunWith(EasyMockRunner.class)
+public class BaeldungReaderAnnotatedUnitTest {
+
+    @Mock ArticleReader mockArticleReader;
+
+    @Mock IArticleWriter mockArticleWriter;
+
+    @TestSubject BaeldungReader baeldungReader = new BaeldungReader();
+
+    @Test
+    public void givenBaeldungReader_whenReadNext_thenNextArticleRead() {
+        expect(mockArticleReader.next()).andReturn(null);
+        replay(mockArticleReader);
+        baeldungReader.readNext();
+        verify(mockArticleReader);
+    }
+
+    @Mock BaeldungReader mockBaeldungReader;
+
+    @Test
+    public void givenBaeldungReader_whenWrite_thenWriterCalled() {
+        expect(mockArticleWriter.write("title", "content")).andReturn(null);
+        replay(mockArticleWriter);
+        baeldungReader.write("title", "content");
+        verify(mockArticleWriter);
+    }
+
+    @Test
+    public void givenArticlesInReader_whenReadTillEnd_thenThrowException() {
+        expect(mockArticleReader.next())
+          .andReturn(null)
+          .times(2)
+          .andThrow(new NoSuchElementException());
+        replay(mockArticleReader);
+        try {
+            for (int i = 0; i < 3; i++) {
+                baeldungReader.readNext();
+            }
+        } catch (Exception ignored) {
+        }
+        verify(mockArticleReader);
+    }
+
+}
+

testing-modules/mocks/mock-comparisons/src/test/java/com/baeldung/easymock/BaeldungReaderAnnotatedWithRuleUnitTest.java

@@ -0,0 +1,57 @@
+package com.baeldung.easymock;
+
+import org.easymock.EasyMockRule;
+import org.easymock.Mock;
+import org.easymock.TestSubject;
+import org.junit.*;
+
+import java.util.NoSuchElementException;
+
+import static org.easymock.EasyMock.*;
+
+public class BaeldungReaderAnnotatedWithRuleUnitTest {
+
+    @Rule public EasyMockRule mockRule = new EasyMockRule(this);
+
+    @Mock ArticleReader mockArticleReader;
+
+    @Mock IArticleWriter mockArticleWriter;
+
+    @TestSubject BaeldungReader baeldungReader = new BaeldungReader();
+
+    @Test
+    public void givenBaeldungReader_whenReadNext_thenNextArticleRead() {
+        expect(mockArticleReader.next()).andReturn(null);
+        replay(mockArticleReader);
+        baeldungReader.readNext();
+        verify(mockArticleReader);
+    }
+
+    @Mock BaeldungReader mockBaeldungReader;
+
+    @Test
+    public void givenBaeldungReader_whenWrite_thenWriterCalled() {
+        expect(mockArticleWriter.write("title", "content")).andReturn(null);
+        replay(mockArticleWriter);
+        baeldungReader.write("title", "content");
+        verify(mockArticleWriter);
+    }
+
+    @Test
+    public void givenArticlesInReader_whenReadTillEnd_thenThrowException() {
+        expect(mockArticleReader.next())
+          .andReturn(null)
+          .times(2)
+          .andThrow(new NoSuchElementException());
+        replay(mockArticleReader);
+        try {
+            for (int i = 0; i < 3; i++) {
+                baeldungReader.readNext();
+            }
+        } catch (Exception ignored) {
+        }
+        verify(mockArticleReader);
+    }
+
+}
+

testing-modules/mocks/mock-comparisons/src/test/java/com/baeldung/easymock/BaeldungReaderMockDelegationUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.easymock;
+
+import org.easymock.*;
+import org.junit.*;
+
+import static org.easymock.EasyMock.*;
+
+public class BaeldungReaderMockDelegationUnitTest {
+
+    EasyMockSupport easyMockSupport = new EasyMockSupport();
+
+    @Test
+    public void givenBaeldungReader_whenReadAndWriteSequencially_thenWorks() {
+        ArticleReader mockArticleReader = easyMockSupport.createMock(ArticleReader.class);
+        IArticleWriter mockArticleWriter = easyMockSupport.createMock(IArticleWriter.class);
+        BaeldungReader baeldungReader = new BaeldungReader(mockArticleReader, mockArticleWriter);
+
+        expect(mockArticleReader.next()).andReturn(null);
+        expect(mockArticleWriter.write("title", "content")).andReturn("");
+        easyMockSupport.replayAll();
+
+        baeldungReader.readNext();
+        baeldungReader.write("title", "content");
+        easyMockSupport.verifyAll();
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/test/java/com/baeldung/easymock/BaeldungReaderMockSupportUnitTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.easymock;
+
+import org.easymock.*;
+import org.junit.*;
+import org.junit.runner.RunWith;
+
+import java.util.NoSuchElementException;
+
+import static org.easymock.EasyMock.*;
+import static org.junit.Assert.assertEquals;
+
+@RunWith(EasyMockRunner.class)
+public class BaeldungReaderMockSupportUnitTest extends EasyMockSupport {
+
+    @TestSubject BaeldungReader baeldungReader = new BaeldungReader();
+    @Mock ArticleReader mockArticleReader;
+    @Mock IArticleWriter mockArticleWriter;
+
+    @Test
+    public void givenBaeldungReader_whenReadAndWriteSequencially_thenWorks() {
+        expect(mockArticleReader.next())
+          .andReturn(null)
+          .times(2)
+          .andThrow(new NoSuchElementException());
+        expect(mockArticleWriter.write("title", "content")).andReturn("BAEL-201801");
+        replayAll();
+
+        Exception expectedException = null;
+        try {
+            for (int i = 0; i < 3; i++) {
+                baeldungReader.readNext();
+            }
+        } catch (Exception exception) {
+            expectedException = exception;
+        }
+        String articleId = baeldungReader.write("title", "content");
+        verifyAll();
+        assertEquals(NoSuchElementException.class, expectedException.getClass());
+        assertEquals("BAEL-201801", articleId);
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/test/java/com/baeldung/easymock/BaeldungReaderUnitTest.java

@@ -0,0 +1,105 @@
+package com.baeldung.easymock;
+
+import org.junit.*;
+
+import java.util.NoSuchElementException;
+
+import static org.easymock.EasyMock.*;
+import static org.junit.Assert.assertEquals;
+
+public class BaeldungReaderUnitTest {
+
+    private BaeldungReader baeldungReader;
+
+    private ArticleReader mockArticleReader;
+
+    private IArticleWriter mockArticleWriter;
+
+    @Test
+    public void givenBaeldungReader_whenReadNext_thenNextArticleRead() {
+        mockArticleReader = mock(ArticleReader.class);
+        baeldungReader = new BaeldungReader(mockArticleReader);
+
+        expect(mockArticleReader.next()).andReturn(null);
+        replay(mockArticleReader);
+
+        BaeldungArticle article = baeldungReader.readNext();
+        verify(mockArticleReader);
+        assertEquals(null, article);
+    }
+
+    @Test
+    public void givenBaeldungReader_whenReadNextAndSkimTopics_thenAllAllowed() {
+        mockArticleReader = strictMock(ArticleReader.class);
+        baeldungReader = new BaeldungReader(mockArticleReader);
+
+        expect(mockArticleReader.next()).andReturn(null);
+        expect(mockArticleReader.ofTopic("easymock")).andReturn(null);
+        replay(mockArticleReader);
+
+        baeldungReader.readNext();
+        baeldungReader.readTopic("easymock");
+        verify(mockArticleReader);
+    }
+
+    @Test
+    public void givenBaeldungReader_whenReadNextAndOthers_thenAllowed() {
+        mockArticleReader = niceMock(ArticleReader.class);
+        baeldungReader = new BaeldungReader(mockArticleReader);
+
+        expect(mockArticleReader.next()).andReturn(null);
+        replay(mockArticleReader);
+
+        baeldungReader.readNext();
+        baeldungReader.readTopic("easymock");
+        verify(mockArticleReader);
+    }
+
+    @Test
+    public void givenBaeldungReader_whenWriteMaliciousContent_thenArgumentIllegal() {
+        mockArticleWriter = mock(IArticleWriter.class);
+        baeldungReader = new BaeldungReader(mockArticleWriter);
+        expect(mockArticleWriter.write("easymock", "<body onload=alert('baeldung')>")).andThrow(new IllegalArgumentException());
+        replay(mockArticleWriter);
+
+        Exception expectedException = null;
+        try {
+            baeldungReader.write("easymock", "<body onload=alert('baeldung')>");
+        } catch (Exception exception) {
+            expectedException = exception;
+        }
+
+        verify(mockArticleWriter);
+        assertEquals(IllegalArgumentException.class, expectedException.getClass());
+    }
+
+    @Test
+    public void givenBaeldungReader_whenWrite_thenWriterCalled() {
+        mockArticleWriter = mock(IArticleWriter.class);
+        baeldungReader = new BaeldungReader(mockArticleWriter);
+        expect(mockArticleWriter.write("title", "content")).andReturn(null);
+        replay(mockArticleWriter);
+        String articleId = baeldungReader.write("title", "content");
+        verify(mockArticleWriter);
+        assertEquals(null, articleId);
+    }
+
+    @Test
+    public void givenArticlesInReader_whenReadTillEnd_thenThrowException() {
+        ArticleReader mockArticleReader = mock(ArticleReader.class);
+        baeldungReader = new BaeldungReader(mockArticleReader);
+        expect(mockArticleReader.next())
+          .andReturn(null)
+          .times(2)
+          .andThrow(new NoSuchElementException());
+        replay(mockArticleReader);
+        try {
+            for (int i = 0; i < 3; i++) {
+                baeldungReader.readNext();
+            }
+        } catch (Exception ignored) {
+        }
+        verify(mockArticleReader);
+    }
+
+}

testing-modules/mocks/mock-comparisons/src/test/java/org/baeldung/mocks/easymock/LoginControllerIntegrationTest.java

@@ -0,0 +1,143 @@
+package org.baeldung.mocks.easymock;
+
+import org.baeldung.mocks.testCase.LoginController;
+import org.baeldung.mocks.testCase.LoginDao;
+import org.baeldung.mocks.testCase.LoginService;
+import org.baeldung.mocks.testCase.UserForm;
+import org.easymock.*;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(EasyMockRunner.class)
+public class LoginControllerIntegrationTest {
+
+    @Mock
+    private LoginDao loginDao;
+
+    @Mock
+    private LoginService loginService;
+
+    @TestSubject
+    private LoginController loginController = new LoginController();
+
+    @Test
+    public void assertThatNoMethodHasBeenCalled() {
+        EasyMock.replay(loginService);
+        loginController.login(null);
+
+        // no method called
+        EasyMock.verify(loginService);
+    }
+
+    @Test
+    public void assertTwoMethodsHaveBeenCalled() {
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        EasyMock.expect(loginService.login(userForm)).andReturn(true);
+        loginService.setCurrentUser("foo");
+        EasyMock.replay(loginService);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        EasyMock.verify(loginService);
+    }
+
+    @Test
+    public void assertOnlyOneMethodHasBeenCalled() {
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        EasyMock.expect(loginService.login(userForm)).andReturn(false);
+        EasyMock.replay(loginService);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("KO", login);
+        EasyMock.verify(loginService);
+    }
+
+    @Test
+    public void mockExceptionThrowing() {
+        UserForm userForm = new UserForm();
+        EasyMock.expect(loginService.login(userForm)).andThrow(new IllegalArgumentException());
+        EasyMock.replay(loginService);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("ERROR", login);
+        EasyMock.verify(loginService);
+    }
+
+    @Test
+    public void mockAnObjectToPassAround() {
+        UserForm userForm = EasyMock.mock(UserForm.class);
+        EasyMock.expect(userForm.getUsername()).andReturn("foo");
+        EasyMock.expect(loginService.login(userForm)).andReturn(true);
+        loginService.setCurrentUser("foo");
+        EasyMock.replay(userForm);
+        EasyMock.replay(loginService);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        EasyMock.verify(userForm);
+        EasyMock.verify(loginService);
+    }
+
+    @Test
+    public void argumentMatching() {
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        // default matcher
+        EasyMock.expect(loginService.login(EasyMock.isA(UserForm.class))).andReturn(true);
+        // complex matcher
+        loginService.setCurrentUser(specificArgumentMatching("foo"));
+        EasyMock.replay(loginService);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        EasyMock.verify(loginService);
+    }
+
+    private static String specificArgumentMatching(final String expected) {
+        EasyMock.reportMatcher(new IArgumentMatcher() {
+            @Override
+            public boolean matches(Object argument) {
+                return argument instanceof String && ((String) argument).startsWith(expected);
+            }
+
+            @Override
+            public void appendTo(StringBuffer buffer) {
+                //NOOP
+            }
+        });
+        return null;
+    }
+
+    @Test
+    public void partialMocking() {
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        // use partial mock
+        LoginService loginServicePartial = EasyMock.partialMockBuilder(LoginService.class).
+                addMockedMethod("setCurrentUser").createMock();
+        loginServicePartial.setCurrentUser("foo");
+        // let service's login use implementation so let's mock DAO call
+        EasyMock.expect(loginDao.login(userForm)).andReturn(1);
+
+        loginServicePartial.setLoginDao(loginDao);
+        loginController.loginService = loginServicePartial;
+
+        EasyMock.replay(loginDao);
+        EasyMock.replay(loginServicePartial);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        // verify mocked call
+        EasyMock.verify(loginServicePartial);
+        EasyMock.verify(loginDao);
+    }
+}

testing-modules/mocks/mock-comparisons/src/test/java/org/baeldung/mocks/jmockit/LoginControllerIntegrationTest.java

@@ -0,0 +1,159 @@
+package org.baeldung.mocks.jmockit;
+
+import mockit.*;
+import mockit.integration.junit4.JMockit;
+import org.baeldung.mocks.testCase.LoginController;
+import org.baeldung.mocks.testCase.LoginDao;
+import org.baeldung.mocks.testCase.LoginService;
+import org.baeldung.mocks.testCase.UserForm;
+import org.hamcrest.BaseMatcher;
+import org.hamcrest.Description;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(JMockit.class)
+public class LoginControllerIntegrationTest {
+
+    @Injectable
+    private LoginDao loginDao;
+
+    @Injectable
+    private LoginService loginService;
+
+    @Tested
+    private LoginController loginController;
+
+    @Test
+    public void assertThatNoMethodHasBeenCalled() {
+        loginController.login(null);
+        // no method called
+        new FullVerifications(loginService) {
+        };
+    }
+
+    @Test
+    public void assertTwoMethodsHaveBeenCalled() {
+        final UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        new Expectations() {{
+            loginService.login(userForm);
+            result = true;
+            loginService.setCurrentUser("foo");
+        }};
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        new FullVerifications(loginService) {
+        };
+    }
+
+    @Test
+    public void assertOnlyOneMethodHasBeenCalled() {
+        final UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        new Expectations() {{
+            loginService.login(userForm);
+            result = false;
+            // no expectation for setCurrentUser
+        }};
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("KO", login);
+        new FullVerifications(loginService) {
+        };
+    }
+
+    @Test
+    public void mockExceptionThrowing() {
+        final UserForm userForm = new UserForm();
+        new Expectations() {{
+            loginService.login(userForm);
+            result = new IllegalArgumentException();
+            // no expectation for setCurrentUser
+        }};
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("ERROR", login);
+        new FullVerifications(loginService) {
+        };
+    }
+
+    @Test
+    public void mockAnObjectToPassAround(@Mocked final UserForm userForm) {
+        new Expectations() {{
+            userForm.getUsername();
+            result = "foo";
+            loginService.login(userForm);
+            result = true;
+            loginService.setCurrentUser("foo");
+        }};
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        new FullVerifications(loginService) {
+        };
+        new FullVerifications(userForm) {
+        };
+    }
+
+    @Test
+    public void argumentMatching() {
+        final UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        // default matcher
+        new Expectations() {{
+            loginService.login((UserForm) any);
+            result = true;
+            // complex matcher
+            loginService.setCurrentUser(withArgThat(new BaseMatcher<String>() {
+                @Override
+                public boolean matches(Object item) {
+                    return item instanceof String && ((String) item).startsWith("foo");
+                }
+
+                @Override
+                public void describeTo(Description description) {
+                    //NOOP
+                }
+            }));
+        }};
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        new FullVerifications(loginService) {
+        };
+    }
+
+    @Test
+    public void partialMocking() {
+        // use partial mock
+        final LoginService partialLoginService = new LoginService();
+        partialLoginService.setLoginDao(loginDao);
+        loginController.loginService = partialLoginService;
+
+        final UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        // let service's login use implementation so let's mock DAO call
+        new Expectations() {{
+            loginDao.login(userForm);
+            result = 1;
+            // no expectation for loginService.login
+            partialLoginService.setCurrentUser("foo");
+        }};
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        // verify mocked call
+        new FullVerifications(partialLoginService) {
+        };
+        new FullVerifications(loginDao) {
+        };
+    }
+}

testing-modules/mocks/mock-comparisons/src/test/java/org/baeldung/mocks/mockito/LoginControllerIntegrationTest.java

@@ -0,0 +1,149 @@
+package org.baeldung.mocks.mockito;
+
+import org.baeldung.mocks.testCase.LoginController;
+import org.baeldung.mocks.testCase.LoginDao;
+import org.baeldung.mocks.testCase.LoginService;
+import org.baeldung.mocks.testCase.UserForm;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.ArgumentMatcher;
+import org.mockito.ArgumentMatchers;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+import org.mockito.Spy;
+
+public class LoginControllerIntegrationTest {
+
+    @Mock
+    private LoginDao loginDao;
+
+    @Spy
+    @InjectMocks
+    private LoginService spiedLoginService;
+
+    @Mock
+    private LoginService loginService;
+
+    @InjectMocks
+    private LoginController loginController;
+
+    @Before
+    public void setUp() {
+        loginController = new LoginController();
+        MockitoAnnotations.initMocks(this);
+    }
+
+    @Test
+    public void assertThatNoMethodHasBeenCalled() {
+        loginController.login(null);
+        // no method called
+        Mockito.verifyZeroInteractions(loginService);
+    }
+
+    @Test
+    public void assertTwoMethodsHaveBeenCalled() {
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        Mockito.when(loginService.login(userForm))
+            .thenReturn(true);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        Mockito.verify(loginService)
+            .login(userForm);
+        Mockito.verify(loginService)
+            .setCurrentUser("foo");
+    }
+
+    @Test
+    public void assertOnlyOneMethodHasBeenCalled() {
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        Mockito.when(loginService.login(userForm))
+            .thenReturn(false);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("KO", login);
+        Mockito.verify(loginService)
+            .login(userForm);
+        Mockito.verifyNoMoreInteractions(loginService);
+    }
+
+    @Test
+    public void mockExceptionThrowing() {
+        UserForm userForm = new UserForm();
+        Mockito.when(loginService.login(userForm))
+            .thenThrow(IllegalArgumentException.class);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("ERROR", login);
+        Mockito.verify(loginService)
+            .login(userForm);
+        Mockito.verifyZeroInteractions(loginService);
+    }
+
+    @Test
+    public void mockAnObjectToPassAround() {
+        UserForm userForm = Mockito.when(Mockito.mock(UserForm.class)
+            .getUsername())
+            .thenReturn("foo")
+            .getMock();
+        Mockito.when(loginService.login(userForm))
+            .thenReturn(true);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        Mockito.verify(loginService)
+            .login(userForm);
+        Mockito.verify(loginService)
+            .setCurrentUser("foo");
+    }
+
+    @Test
+    public void argumentMatching() {
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        // default matcher
+        Mockito.when(loginService.login(Mockito.any(UserForm.class)))
+            .thenReturn(true);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        Mockito.verify(loginService)
+            .login(userForm);
+        // complex matcher
+        Mockito.verify(loginService)
+            .setCurrentUser(ArgumentMatchers.argThat(new ArgumentMatcher<String>() {
+                @Override
+                public boolean matches(String argument) {
+                    return argument.startsWith("foo");
+                }
+            }));
+    }
+
+    @Test
+    public void partialMocking() {
+        // use partial mock
+        loginController.loginService = spiedLoginService;
+        UserForm userForm = new UserForm();
+        userForm.username = "foo";
+        // let service's login use implementation so let's mock DAO call
+        Mockito.when(loginDao.login(userForm))
+            .thenReturn(1);
+
+        String login = loginController.login(userForm);
+
+        Assert.assertEquals("OK", login);
+        // verify mocked call
+        Mockito.verify(spiedLoginService)
+            .setCurrentUser("foo");
+    }
+}