add PIT

Author: rieckpil

spring-boot-example/pom.xml

@@ -453,6 +453,14 @@
             <version>1.2.1</version>
           </dependency>
         </dependencies>
+        <configuration>
+          <targetClasses>
+            <param>de.rieckpil.blog.pit.*</param>
+          </targetClasses>
+          <targetTests>
+            <param>de.rieckpil.blog.pit.*Test</param>
+          </targetTests>
+        </configuration>
       </plugin>
     </plugins>
   </build>

spring-boot-example/src/main/java/de/rieckpil/blog/pit/FraudDetector.java

@@ -0,0 +1,23 @@
+package de.rieckpil.blog.pit;
+
+import java.util.Set;
+
+public class FraudDetector {
+
+  private static final Set<String> HIGH_RISK_COUNTRIES =
+    Set.of("WONDERLAND", "MARS", "URANUS");
+
+  public boolean isFraudulentTransaction(double amount, String country) {
+    // Any transaction above 10k is flagged
+    if (amount > 10_000) {
+      return true;
+    }
+
+    // Transactions from high-risk countries are flagged
+    if (HIGH_RISK_COUNTRIES.contains(country)) {
+      return true;
+    }
+
+    return false;
+  }
+}

spring-boot-example/src/test/java/de/rieckpil/blog/pit/FraudDetectorTests.java

@@ -0,0 +1,35 @@
+package de.rieckpil.blog.pit;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.verify;
+
+class FraudDetectorTest {
+
+  @Test
+  void testHighAmountTransaction() {
+    FraudDetector detector = new FraudDetector();
+
+    assertTrue(detector.isFraudulentTransaction(15_000, "USA"));
+  }
+
+  @Test
+  void testHighRiskCountryTransaction() {
+    FraudDetector detector = new FraudDetector();
+
+    assertTrue(detector.isFraudulentTransaction(500, "MARS"));
+  }
+
+  @Test
+  void testSafeTransaction() {
+    FraudDetector cut = new FraudDetector();
+
+    assertFalse(cut.isFraudulentTransaction(200, "USA"));
+  }
+}