Inited basic project structure for Mockito practice.

Author: MewX

JustPractice/java/javamockito/build.gradle

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+group 'javamockito'
+version '1.0-SNAPSHOT'
+
+apply plugin: 'java'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testCompile group: 'org.mockito', name: 'mockito-all', version: '1.8.4'
+}

JustPractice/java/javamockito/settings.gradle

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+rootProject.name = 'javamockito'
+

JustPractice/java/javamockito/src/main/org/mewx/practice/javamockito/Main.java

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+package org.mewx.practice.javamockito;
+
+import java.util.ArrayList;
+
+public class Main {
+    public static void main(String[] args) {
+        ArrayList<String> input = new ArrayList<>();
+        input.add("One message");
+
+        Message messageHost = new Message();
+        new ServiceCaller().callService(input, messageHost);
+    }
+}

JustPractice/java/javamockito/src/main/org/mewx/practice/javamockito/Message.java

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+package org.mewx.practice.javamockito;
+
+import java.util.ArrayList;
+
+public class Message {
+    private ArrayList<String> messages = new ArrayList<>();
+
+    public void addMessage(String msg) {
+        messages.add(msg);
+    }
+
+    public int getSize() {
+        return messages.size();
+    }
+
+    public String getMessageAt(int idx) {
+        return idx < messages.size() ? messages.get(idx) : null;
+    }
+}

JustPractice/java/javamockito/src/main/org/mewx/practice/javamockito/Service.java

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+package org.mewx.practice.javamockito;
+
+import java.util.List;
+
+/**
+ * The supposed rule is when the size of the list is less than 2, add a message to message
+ */
+public class Service {
+    static final String ERROR_MSG = "This is an error message";
+
+    public void runService(List<String> list, Message message) {
+        final int THRESHOLD = 2;
+        if (list.size() < THRESHOLD) {
+            message.addMessage(ERROR_MSG);
+        }
+    }
+}

JustPractice/java/javamockito/src/main/org/mewx/practice/javamockito/ServiceCaller.java

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+package org.mewx.practice.javamockito;
+
+import java.util.List;
+
+public class ServiceCaller {
+    public void callService(List<String> list, Message messageHost) {
+        new Service().runService(list, messageHost);
+    }
+}

JustPractice/java/javamockito/src/test/org/mewx/practice/javamockito/MessageTest.java

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+package org.mewx.practice.javamockito;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class MessageTest {
+    private Message message;
+
+    @Before
+    public void setUp() {
+        message = new Message();
+    }
+
+    @Test
+    public void addMessage() {
+        assertEquals(0, message.getSize());
+        message.addMessage("new message");
+        assertEquals(1, message.getSize());
+    }
+
+    @Test
+    public void getMessageAt() {
+        final String NEW_MSG = "new message";
+        assertEquals(null, message.getMessageAt(0));
+        message.addMessage(NEW_MSG);
+        assertEquals(NEW_MSG, message.getMessageAt(0));
+    }
+}

JustPractice/java/javamockito/src/test/org/mewx/practice/javamockito/ServiceTest.java

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+package org.mewx.practice.javamockito;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.Assert.*;
+
+public class ServiceTest {
+    private Service service;
+    private Message message;
+    private ArrayList<String> list;
+
+    @Before
+    public void setUp() {
+        service = new Service();
+        message = new Message();
+        list = new ArrayList<>();
+    }
+
+    @Test
+    public void runServiceWithNoneInList() {
+        service.runService(list, message);
+        assertEquals(1, message.getSize());
+        assertEquals(Service.ERROR_MSG, message.getMessageAt(0));
+    }
+
+    @Test
+    public void runServiceWithOneInList() {
+        list.add("One");
+
+        service.runService(list, message);
+        assertEquals(1, message.getSize());
+        assertEquals(Service.ERROR_MSG, message.getMessageAt(0));
+    }
+
+    @Test
+    public void runServiceWithTwoInList() {
+        list.add("One");
+        list.add("Two");
+
+        service.runService(list, message);
+        assertEquals(0, message.getSize());
+    }
+}