add all of the testing

src/plugins/__tests__/markdown-compiler.test.ts

@@ -0,0 +1,43 @@
+import { expect, test } from "bun:test";
+import MarkdownCompiler from "../markdown-compiler";
+
+// Mock marked and parseMetadata for isolated testing
+const mockMarked = {
+  parse: (text: string) => `<p>${text}</p>`,
+};
+const mockParseMetadata = (file: string) => {
+  if (file.startsWith("title=Hello\n=+\n")) {
+    return { title: "Hello" };
+  }
+  return undefined;
+};
+
+// Patch dependencies
+// @ts-expect-error
+MarkdownCompiler.prototype["marked"] = mockMarked;
+// @ts-expect-error
+MarkdownCompiler.prototype["parseMetadata"] = mockParseMetadata;
+
+test("MarkdownCompiler compiles markdown to HTML", async () => {
+  const plugin = new MarkdownCompiler();
+  const input = "# Hello World";
+  // Simulate marked.parse
+  const output = await plugin.rewriteFile(input, "test.md");
+  expect(typeof output).toBe("string");
+  expect(output).toContain("Hello World");
+});
+
+test("MarkdownCompiler uses metadata title if present", async () => {
+  const plugin = new MarkdownCompiler();
+  const input = "title=Hello\n=+\n# Some Content";
+  const output = await plugin.rewriteFile(input, "test.md");
+  expect(output).toContain("Hello");
+  expect(output).toContain("Some Content");
+});
+
+test("MarkdownCompiler returns HTML for markdown without metadata", async () => {
+  const plugin = new MarkdownCompiler();
+  const input = "# Just Markdown";
+  const output = await plugin.rewriteFile(input, "test.md");
+  expect(output).toContain("Just Markdown");
+});