feat: add a function to handle log4j fix and its test, add it to arguments.ts and finish arguments.test.ts

tests/log4j.test.ts

@@ -0,0 +1,34 @@
+import { expect, test, vi } from "vitest";
+import * as nlk from "../dist/index.js";
+import path from "path";
+import { hash } from "crypto";
+import fs from "fs/promises";
+
+const root = path.join(import.meta.dirname, "temp");
+const xmlFile = path.join(root, "client-1.21.2.xml");
+try {
+  await fs.rm(xmlFile, { recursive: true });
+} catch {
+  // first time the test is runned
+}
+
+// mock os to linux for testing
+vi.stubGlobal("process", { platform: "linux" });
+
+test(
+  "download xml file and return correct arguments",
+  { timeout: 10000 },
+  async () => {
+    const versionManifest = await nlk.core.version.getVersionManifest("1.21.8");
+    const arg = await nlk.core.log4j.getArgument(versionManifest, root);
+
+    expect(arg, "correct arg returned").toBe(
+      `-Dlog4j.configurationFile=${xmlFile}`,
+    );
+
+    expect(
+      hash("sha1", await fs.readFile(xmlFile, { encoding: "utf-8" })),
+      "correct hash",
+    ).toBe("39384bd14c0606d812afec88d8aff595b2587dd9");
+  },
+);