test: Add Unit Test for LargestPrimeDivisor

pom.xml

@@ -0,0 +1,47 @@
+<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>com.interviews</groupId>
+    <artifactId>interviews</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>Interviews Project</name>
+
+    <!-- Java version -->
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+    </properties>
+
+    <!-- Dependencies -->
+    <dependencies>
+        <!-- JUnit 5 -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.8.2</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <!-- Build configuration to use custom source directories -->
+    <build>
+        <sourceDirectory>${project.basedir}/uva</sourceDirectory>
+        <testSourceDirectory>${project.basedir}/test</testSourceDirectory>
+        <plugins>
+            <!-- Compiler plugin -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.8.1</version>
+            </plugin>
+
+            <!-- Surefire plugin for running tests -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.0.0-M5</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

test/LargestPrimeDivisorTest.java

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+import org.junit.jupiter.api.Test;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class LargestPrimeDivisorTest {
+
+  private String runLargestPrimeDivisor(String input) {
+    ByteArrayInputStream in = new ByteArrayInputStream(input.getBytes());
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+
+    System.setIn(in);
+    System.setOut(new PrintStream(out));
+
+    // Gọi hàm main
+    LargestPrimeDivisor.main(new String[]{});
+
+    return out.toString().trim();
+  }
+
+  @Test
+  public void testSmallNumbers() {
+    String input = "2\n6\n100\n0\n";
+    String expectedOutput = "-1\n3\n5";
+    assertEquals(expectedOutput, runLargestPrimeDivisor(input));
+  }
+
+  @Test
+  public void testPrimeNumber() {
+    String input = "17\n0\n";
+    String expectedOutput = "-1";
+    assertEquals(expectedOutput, runLargestPrimeDivisor(input));
+  }
+
+  @Test
+  public void testLargeNumber() {
+    String input = "13195\n0\n";
+    String expectedOutput = "29"; // Ước số nguyên tố lớn nhất của 13195 là 29
+    assertEquals(expectedOutput, runLargestPrimeDivisor(input));
+  }
+
+  @Test
+  public void testNegativeNumbers() {
+    String input = "-100\n0\n";
+    String expectedOutput = "5";
+    assertEquals(expectedOutput, runLargestPrimeDivisor(input));
+  }
+}