Initial revision

.gitignore

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+# Maven
+target/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Eclipse
+/.classpath
+/.settings/
+/.project
+/bin/
+
+# IntelliJ
+.idea
+*.iml
+*.ipr
+*.iws
+
+# Misc
+*.log

README.md

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+# Java JUnit Example
+
+## Kebutuhan
+- Java JDK
+- Maven 3+
+
+## Cara menjalankan
+### Build
+- Jalankan `mvn package`
+- Jalankan jar `java -jar target/polmed-calculator-1.0-SNAPSHOT.jar add 1 2`
+
+### Pengujian
+- Jalankan `mvn test`

pom.xml

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+<?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>id.polmed.calculator</groupId>
+	<artifactId>polmed-calculator</artifactId>
+	<version>1.0-SNAPSHOT</version>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>${maven.compiler.source}</maven.compiler.target>
+	</properties>
+
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.junit</groupId>
+				<artifactId>junit-bom</artifactId>
+				<version>5.10.0</version>
+				<type>pom</type>
+				<scope>import</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>3.1.2</version>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-jar-plugin</artifactId>
+				<version>3.3.0</version>
+				<configuration>
+					<archive>
+						<manifest>
+							<addClasspath>true</addClasspath>
+							<classpathPrefix>libs/</classpathPrefix>
+							<mainClass>
+								id.polmed.calculator.Main
+							</mainClass>
+						</manifest>
+					</archive>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

src/main/java/id/polmed/calculator/Calculator.java

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+package id.polmed.calculator;
+
+public class Calculator {
+
+	public int add(int a, int b) {
+		return a + b;
+	}
+	public int substract(int a, int b) {
+		return a - b;
+	}
+	public int multiply(int a, int b) {
+		return a * b;
+	}
+	public float divide(int a, int b) {
+		return (float) a/b;
+	}
+}

src/main/java/id/polmed/calculator/Main.java

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+package id.polmed.calculator;
+
+public class Main {
+    public static void main(String[] args) {
+        Calculator calculator = new Calculator();
+        if(args.length != 3) {
+            System.out.println("Usage: polmed-calculator operation number1 number2");
+            return;
+        }
+        switch(args[0]) {
+            case "add":
+                    System.out.println(calculator.add(Integer.parseInt(args[1]), Integer.parseInt(args[2])));
+                break;
+            case "substract":
+                    System.out.println(calculator.substract(Integer.parseInt(args[1]), Integer.parseInt(args[2])));
+                break;
+            case "multiply":
+                    System.out.println(calculator.multiply(Integer.parseInt(args[1]), Integer.parseInt(args[2])));
+                break;
+            case "divide":
+                    System.out.println(calculator.divide(Integer.parseInt(args[1]), Integer.parseInt(args[2])));
+                break;
+        }
+
+    }
+}

src/test/java/id/polmed/calculator/CalculatorTests.java

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+package id.polmed.calculator;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+class CalculatorTests {
+
+	@Test
+	@DisplayName("1 + 1 = 2")
+	void addsTwoNumbers() {
+		Calculator calculator = new Calculator();
+		assertEquals(2, calculator.add(1, 1), "1 + 1 should equal 2");
+	}
+
+	@ParameterizedTest(name = "{0} + {1} = {2}")
+	@CsvSource({
+			"0,    1,   1",
+			"1,    2,   3",
+			"49,  51, 100",
+			"1,  100, 101"
+	})
+	void add(int first, int second, int expectedResult) {
+		Calculator calculator = new Calculator();
+		assertEquals(expectedResult, calculator.add(first, second),
+				() -> first + " + " + second + " should equal " + expectedResult);
+	}
+
+
+	@Test
+	@DisplayName("2 - 1 = 1")
+	void substractTwoNumbers() {
+		Calculator calculator = new Calculator();
+		assertEquals(1, calculator.substract(2, 1), "2 - 1 should equal 1");
+	}
+
+	@ParameterizedTest(name = "{0} - {1} = {2}")
+	@CsvSource({
+			"0,    1,   -1",
+			"5,    2,   3",
+			"100,  51, 49",
+			"101,  100, 1"
+	})
+	void substract(int first, int second, int expectedResult) {
+		Calculator calculator = new Calculator();
+		assertEquals(expectedResult, calculator.substract(first, second),
+				() -> first + " - " + second + " should equal " + expectedResult);
+	}
+
+
+	@Test
+	@DisplayName("2 * 1 = 2")
+	void multiplyTwoNumbers() {
+		Calculator calculator = new Calculator();
+		assertEquals(2, calculator.multiply(2, 1), "2 * 1 should equal 2");
+	}
+
+	@ParameterizedTest(name = "{0} * {1} = {2}")
+	@CsvSource({
+			"0,    1,   0",
+			"5,    -2,   -10",
+			"100,  51, 5100",
+			"101,  100, 10100"
+	})
+	void multiply(int first, int second, int expectedResult) {
+		Calculator calculator = new Calculator();
+		assertEquals(expectedResult, calculator.multiply(first, second),
+				() -> first + " * " + second + " should equal " + expectedResult);
+	}
+
+	@Test
+	@DisplayName("1 / 2 = 0.5")
+	void divideTwoNumbers() {
+		Calculator calculator = new Calculator();
+		assertEquals(0.5, calculator.divide(1, 2), "1 / 2 should equal 0.5");
+	}
+
+	@ParameterizedTest(name = "{0} / {1} = {2}")
+	@CsvSource({
+			"0,    1,   0",
+			"5,    -2,  -2.5",
+			"100,  20, 5.0",
+			"3,  4, 0.75"
+	})
+	void divide(int first, int second, float expectedResult) {
+		Calculator calculator = new Calculator();
+		assertEquals(expectedResult, calculator.divide(first, second),
+				() -> first + " / " + second + " should equal " + expectedResult);
+	}	
+}