Adds some still not working code for building spigot and bukkit .jar files

src/test/java/net/knarcraft/minecraftserverlauncher/utility/JarBuilderTest.java

@@ -0,0 +1,79 @@
+package net.knarcraft.minecraftserverlauncher.utility;
+
+import net.knarcraft.minecraftserverlauncher.Main;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.MethodOrderer;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+
+import java.io.File;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+public class JarBuilderTest {
+
+    private static JarBuilder jarBuilder;
+    private static String targetDirectory;
+    private static String jarDirectory;
+
+    @BeforeEach
+    public void setUp() {
+        targetDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +
+                "BuildTools" + File.separator;
+        jarDirectory = Main.getApplicationWorkDirectory() + File.separator + "files" + File.separator +
+                "testjars" + File.separator;
+        jarBuilder = new JarBuilder(targetDirectory, jarDirectory);
+        removeBuildToolsFiles();
+    }
+
+    @Test
+    @Order(3)
+    public void buildLatestSpigotJarTest() {
+        jarBuilder.buildSpigotJar();
+        assertTrue(new File(jarDirectory + "SpigotLatest.jar").exists());
+    }
+
+    @Test
+    @Order(4)
+    public void buildLatestBukkitJarTest() {
+        jarBuilder.buildBukkitJar();
+        assertTrue(new File(jarDirectory + "BukkitLatest.jar").exists());
+    }
+
+    @Test
+    @Order(2)
+    public void downloadLatestBuildToolsJarTest() {
+        jarBuilder.downloadBuildTools();
+        assertTrue(new File(targetDirectory + "BuildTools.jar").exists());
+    }
+
+    @Test
+    @Order(1)
+    public void getLatestBuildToolsVersionTest() {
+        try {
+            String latestVersion = jarBuilder.getLatestBuildToolsVersion();
+            assertNotEquals("", latestVersion);
+            int newVersion = Integer.parseInt(latestVersion);
+            assertNotEquals(newVersion, 0);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Removes build tools files
+     */
+    private static void removeBuildToolsFiles() {
+        File target = new File(targetDirectory);
+        if (!target.exists() && !target.mkdirs()) {
+            throw new IllegalArgumentException("Unable to create the test files directory");
+        }
+        CommonFunctions.removeFilesRecursively(target);
+    }
+
+}