JUnit Practice

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

.idea/.name

+sample-project
\ No newline at end of file

.idea/compiler.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="sample-project" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>
\ No newline at end of file

.idea/jarRepositories.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_15" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<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>
+
+    <groupId>org.example</groupId>
+    <artifactId>sample-project</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/junit/junit -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <properties>
+        <maven.compiler.source>15</maven.compiler.source>
+        <maven.compiler.target>15</maven.compiler.target>
+    </properties>
+
+</project>
\ No newline at end of file

sample-project.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />
\ No newline at end of file

src/main/java/Calculator.java

+public class Calculator {
+
+    public int add(int a, int b){
+        return a + b;
+    }
+
+    public int subtract(int a, int b){
+        return a - b;
+    }
+
+    public int multiply(int a, int b){
+        return a * b;
+    }
+
+    public int divide(int a, int b){
+        return a / b;
+    }
+
+}

src/main/java/PrimeNumberChecker.java

+public class PrimeNumberChecker {
+    public Boolean validate(final Integer primeNumber) {
+        for (int i = 2; i < (primeNumber / 2); i++) {
+            if (primeNumber % i == 0) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
\ No newline at end of file

src/test/java/CalculatorTest.java

+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class CalculatorTest {
+
+    @Test
+    public void addTest(){
+        int sum = new Calculator().add(5, 10);
+        Assert.assertTrue("Success", sum == 15);
+    }
+
+    @Test
+    public void failTest(){
+        int sum = new Calculator().add(5, 10);
+        Assert.assertFalse("Failure", sum == 10);
+    }
+
+    @Test
+    public void equals(){
+        int product = new Calculator().multiply(5, 5);
+        Assert.assertEquals(25, product);
+    }
+
+    @Test
+    public void arrayEquals(){
+        int[] nums = {1,2,3};
+        Assert.assertArrayEquals(new int[]{1,2,3}, nums);
+    }
+
+}

src/test/java/PrimeNumberCheckerTest.java

+import java.util.Arrays;
+import java.util.Collection;
+
+import org.junit.Test;
+import org.junit.Before;
+
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+import org.junit.runner.RunWith;
+import static org.junit.Assert.assertEquals;
+
+@RunWith(Parameterized.class)
+public class PrimeNumberCheckerTest {
+    private Integer inputNumber;
+    private Boolean expectedResult;
+    private PrimeNumberChecker primeNumberChecker;
+
+    @Before
+    public void initialize() {
+        primeNumberChecker = new PrimeNumberChecker();
+    }
+
+    // Each parameter should be placed as an argument here
+    // Every time runner triggers, it will pass the arguments
+    // from parameters we defined in primeNumbers() method
+
+    public PrimeNumberCheckerTest(Integer inputNumber, Boolean expectedResult) {
+        this.inputNumber = inputNumber;
+        this.expectedResult = expectedResult;
+    }
+
+    @Parameterized.Parameters
+    public static Collection primeNumbers() {
+        return Arrays.asList(new Object[][] {
+                { 2, true },
+                { 6, false },
+                { 19, true },
+                { 22, false },
+                { 23, true }
+        });
+    }
+
+    // This test will run 4 times since we have 5 parameters defined
+    @Test
+    public void testPrimeNumberChecker() {
+        System.out.println("Parameterized Number is : " + inputNumber);
+        assertEquals(expectedResult,
+                primeNumberChecker.validate(inputNumber));
+    }
+}
\ No newline at end of file

src/test/java/TestRunner.java

+import org.junit.runner.JUnitCore;
+import org.junit.runner.Result;
+import org.junit.runner.notification.Failure;
+
+public class TestRunner {
+    public static void main(String[] args) {
+        Result result = JUnitCore.runClasses(PrimeNumberCheckerTest.class);
+
+        for (Failure failure : result.getFailures()) {
+            System.out.println(failure.toString());
+        }
+
+        System.out.println(result.wasSuccessful());
+    }
+}  	
\ No newline at end of file

src/test/java/TestRunnerClass.java

+import org.junit.runner.JUnitCore;
+import org.junit.runner.Result;
+import org.junit.runner.notification.Failure;
+
+public class TestRunnerClass {
+
+    public static void main(String[] args){
+        Result result = JUnitCore.runClasses(CalculatorTest.class);
+        for(Failure failure : result.getFailures()){
+            System.out.println(failure.toString());
+        }
+        System.out.println(result.wasSuccessful());
+    }
+
+}