keygeneratortestfileadded (#331)

Thanks for the test! Looks great 👍

Author: eshant742

server/src/test/java/dev/findfirst/security/util/KeyGeneratorTest.java

@@ -0,0 +1,80 @@
+package dev.findfirst.security.util;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.NoSuchAlgorithmException;
+import java.util.Base64;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class KeyGeneratorTest {
+
+  @TempDir
+  Path tempDir;
+
+  @Test
+  void testGenerateKeysProducesValidKeys() throws NoSuchAlgorithmException, IOException {
+    Path privateKeyPath = tempDir.resolve("test.key");
+    Path publicKeyPath = tempDir.resolve("test.pub");
+
+    KeyGenerator.generateKeys(privateKeyPath.toString(), publicKeyPath.toString());
+
+    String pubKeyContent = Files.readString(publicKeyPath);
+    assertTrue(pubKeyContent.contains("-----BEGIN PUBLIC KEY-----"), "Public key should start with PEM header");
+    assertTrue(pubKeyContent.contains("-----END PUBLIC KEY-----"), "Public key should end with PEM footer");
+
+    String privKeyContent = Files.readString(privateKeyPath);
+    assertTrue(privKeyContent.contains("-----BEGIN PRIVATE KEY-----"), "Private key should start with PEM header");
+    assertTrue(privKeyContent.contains("-----END PRIVATE KEY-----"), "Private key should end with PEM footer");
+
+    String pubKeyBase64 = pubKeyContent
+        .replace("-----BEGIN PUBLIC KEY-----", "")
+        .replace("-----END PUBLIC KEY-----", "")
+        .replaceAll("\\s", ""); 
+    byte[] pubKeyBytes = Base64.getDecoder().decode(pubKeyBase64);
+    assertTrue(pubKeyBytes.length > 0, "Decoded public key should not be empty");
+  }
+
+  @Test
+  void testGenerateKeysDoesNotOverwriteExistingKeys() throws NoSuchAlgorithmException, IOException {
+    Path privateKeyPath = tempDir.resolve("existing.key");
+    Path publicKeyPath = tempDir.resolve("existing.pub");
+    Files.writeString(privateKeyPath, "dummy private key");
+    Files.writeString(publicKeyPath, "dummy public key");
+
+    KeyGenerator.generateKeys(privateKeyPath.toString(), publicKeyPath.toString());
+
+    assertEquals("dummy private key", Files.readString(privateKeyPath), "Private key file should not be overwritten");
+    assertEquals("dummy public key", Files.readString(publicKeyPath), "Public key file should not be overwritten");
+  }
+
+  @Test
+  void testGenerateKeysProducesDifferentKeysOnSeparateRuns() throws NoSuchAlgorithmException, IOException {
+    Path privateKeyPath1 = tempDir.resolve("test1.key");
+    Path publicKeyPath1 = tempDir.resolve("test1.pub");
+    Path privateKeyPath2 = tempDir.resolve("test2.key");
+    Path publicKeyPath2 = tempDir.resolve("test2.pub");
+    
+    KeyGenerator.generateKeys(privateKeyPath1.toString(), publicKeyPath1.toString());
+    KeyGenerator.generateKeys(privateKeyPath2.toString(), publicKeyPath2.toString());
+
+    String pubKeyContent1 = Files.readString(publicKeyPath1);
+    String pubKeyContent2 = Files.readString(publicKeyPath2);
+
+    String pubKeyBase64_1 = pubKeyContent1
+        .replace("-----BEGIN PUBLIC KEY-----", "")
+        .replace("-----END PUBLIC KEY-----", "")
+        .replaceAll("\\s", "");
+    String pubKeyBase64_2 = pubKeyContent2
+        .replace("-----BEGIN PUBLIC KEY-----", "")
+        .replace("-----END PUBLIC KEY-----", "")
+        .replaceAll("\\s", "");
+
+    assertNotEquals(pubKeyBase64_1, pubKeyBase64_2, "Each generated public key should be unique");
+
+  }
+}