initial commit

JUnitExample.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />
\ 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>JUnitExample</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13</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

src/main/java/my/com/Calculator.java

+package my.com;
+
+public class Calculator {
+    public int add(int x, int y) {
+        return x + y;
+    }
+
+    public int subtract(int x, int y) {
+        return x - y;
+    }
+
+    public int multiply(int x, int y) {
+        return x * y;
+    }
+}

src/test/java/CalculatorTest.java

+
+import my.com.Calculator;
+import org.junit.Test;
+import org.junit.Assert;
+
+public class CalculatorTest {
+
+    @Test
+    public void addTest() {
+        int sum = new Calculator().add(3, 4);
+        Assert.assertTrue("Failed", sum == 7);
+    }
+
+    @Test
+    public void subTest() {
+        int result = new Calculator().subtract(4, 3);
+        Assert.assertEquals(result, 1);
+    }
+
+    @Test
+    public void mulTest() {
+        int result = new Calculator().multiply(4, 3);
+        Assert.assertEquals(result, 12);
+    }
+
+}

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(CalculatorTest.class);
+        for (Failure failure : result.getFailures()) {
+            System.out.println(failure.toString());
+        }
+        System.out.println("Failure count: " + result.getFailureCount());
+    }
+}