junit5 update

README.md

+## Index
+* [Test Coverage](#test-coverage)
+* [Jacoco](#jacoco)
+  * [Exercise: Jacoco with Maven](#exercise-jacoco-with-maven)
+
+---
+
+## Test Coverage
+
+It will include gathering information about which parts of a program are actually executed when running the test suite in order to determine which branches of conditional statements have been taken.
+
+---
+
+## Jacoco
+
+JaCoCo has a plugin on eclipse marketplace and it also has Maven/Gradle plugin and can be integrated with SonarQube.
+
+> We will use jacoco maven implementation with `pom.xml`
+
+### Exercise: Jacoco with Maven
+
+1. Open Eclipse IDE and create Maven project
+
+![maven](./img/mvncreate.png)
+
+2. Make the project GroupId `com.eteration` and Artifact Id `jacoco-demo`
+
+![maven2](./img/projectmvn.png)
+
+3. After theese you will have a project structre like that
+
+```
+├── pom.xml
+├── src
+│   ├── main
+│   │   └── java
+│   │       └── com
+│   │           └── eteration
+│   │               └── jacoco_demo
+│   │                   └── App.java
+│   └── test
+│       └── java
+│           └── com
+│               └── eteration
+│                   └── jacoco_demo
+│                       └── AppTest.java
+└── target
+    ├── classes
+    │   ├── com
+    │   │   └── eteration
+    │   │       └── jacoco_demo
+    │   │           └── App.class
+    │   └── META-INF
+    │       ├── MANIFEST.MF
+    │       └── maven
+    │           └── com.eteration
+    │               └── jacoco-demo
+    │                   ├── pom.properties
+    │                   └── pom.xml
+    └── test-classes
+        └── com
+            └── eteration
+                └── jacoco_demo
+                    └── AppTest.class
+```
+
+4. Open `App.java` inside `src/main/java` or create if does not exist and paste code below
+
+```java
+package com.eteration.jacoco_demo;
+
+public class App {
+
+	public boolean checkPalindrome(String s) {
+		String reverse = new StringBuffer(s).reverse().toString();
+		if (s.equals(reverse)) {
+			return true;
+		}
+
+		else {
+			return false;
+		}
+	}
+	
+}
+```
+
+5. Open `pom.xml` and change the dependency of JUnit as below
+
+```xml
+<dependency>
+	<groupId>org.junit.jupiter</groupId>
+	<artifactId>junit-jupiter-api</artifactId>
+	<version>5.5.0</version>
+</dependency>
+<dependency>
+	<groupId>org.junit.jupiter</groupId>
+	<artifactId>junit-jupiter-engine</artifactId>
+	<version>5.5.0</version>
+	<scope>test</scope>
+</dependency>
+```
+
+6. Open `pom.xml` and add the following lines
+
+```xml
+<build>
+	<plugins>
+		<plugin>
+			<groupId>org.jacoco</groupId>
+			<artifactId>jacoco-maven-plugin</artifactId>
+			<version>0.8.2</version>
+			<executions>
+				<execution>
+					<goals>
+						<goal>prepare-agent</goal>
+					</goals>
+				</execution>
+				<execution>
+					<id>report</id>
+					<phase>test</phase>
+					<goals>
+						<goal>report</goal>
+					</goals>
+				</execution>
+			</executions>
+		</plugin>
+	</plugins>
+</build>
+```
+
+7. Open `AppTest.java` inside`src/test/java` and edit as below
+
+```java
+package com.eteration.jacoco_demo;
+
+import org.junit.Test;
+
+public class AppTest {
+	
+	 @Test
+	 public void palindromeAlgorithmTest() {
+		 
+	 }
+}
+
+```
+8. Run the commands and open `jacoco-demo/target/site/jacoco/index.html`
+
+```
+$ mvn clean install test
+```
+
+As you can see the coverage is 0% because we are not cover the code with test yet.
+
+![index](./img/nocoverage.png)
+
+9. We will cover the code with a simple test. Open `AppTest.java` inside `src/test/java` and add the method as below
+
+```java
+package com.eteration.jacoco_demo;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class AppTest {
+
+	@Test
+	public void palindromeAlgorithmTest() {
+		App palindromeTester = new App();
+		assertTrue(palindromeTester.checkPalindrome("civic"));
+	}
+}
+
+```
+
+10. Run the command again and open `jacoco-demo/target/site/jacoco/index.html`. To access the details showing in the image below, just click the packages and classes.
+
+```
+$ mvn clean install test
+```
+
+![missed](./img/missedbranch.png)
+
+| Color       | Explanaiton                         |
+| ----------- |:-----------------------------------:| 
+| **Red**     | code is not tested or covered.       | 
+| **Green**   | code is tested or covered           | 
+| **Orange**  | code is partially tested or covered.|
+
+> We missed 1 branch which is `else` condition and 1 `line`. We cover the all methods but it is not enough to get 100% coverage.
+
+11. Add the lines into  `palindromeAlgorithmTest` method inside `AppTest.java`
+
+```java
+assertFalse(palindromeTester.checkPalindrome("example"));
+```
+
+12. After adding line into `palindromeAlgorithmTest`, the `AppTest.java` should look like the code below
+
+```java
+package com.eteration.jacoco_demo;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class AppTest {
+
+	@Test
+	public void palindromeAlgorithmTest() {
+		App palindromeTester = new App();
+		assertTrue(palindromeTester.checkPalindrome("civic"));
+		assertFalse(palindromeTester.checkPalindrome("example"));
+	}
+}
+
+```
+
+13. Run the commands again to examine the report from Jacoco.
+
+```
+$ mvn clean install test
+```
+
+14. Open `jacoco-demo/target/site/jacoco/index.html`
+
+![full-cover](./img/fullcover.png)
+