Add jest tests and CI workflow

__tests__/buildNav.test.js

@@ -0,0 +1,15 @@
+const { buildNav } = require('../src/generator');
+
+test('generates navigation tree', () => {
+  const pages = [
+    { file: 'guide/install.md', data: { title: 'Install', order: 1 } },
+    { file: 'guide/usage.md', data: { title: 'Usage', order: 2 } },
+    { file: 'guide/nested/info.md', data: { title: 'Info', order: 1 } }
+  ];
+  const tree = buildNav(pages);
+  const guide = tree.find(n => n.name === 'guide');
+  expect(guide).toBeDefined();
+  expect(guide.children.length).toBe(3);
+  const install = guide.children.find(c => c.name === 'install.md');
+  expect(install.path).toBe('/guide/install.html');
+});

__tests__/loadConfig.test.js

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+const fs = require('fs');
+const path = require('path');
+const loadConfig = require('../src/config/loadConfig');
+
+test('loads configuration and merges defaults', () => {
+  const dir = fs.mkdtempSync(path.join(__dirname, 'cfg-'));
+  const file = path.join(dir, 'config.yaml');
+  fs.writeFileSync(file, 'site:\n  title: Test Site\n');
+  const cfg = loadConfig(file);
+  expect(cfg.site.title).toBe('Test Site');
+  expect(cfg.navigation.search).toBe(true);
+  fs.rmSync(dir, { recursive: true, force: true });
+});

__tests__/pluginHooks.test.js

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+const fs = require('fs');
+const path = require('path');
+const loadPlugins = require('../src/config/loadPlugins');
+
+test('plugin hook modifies data', async () => {
+  const dir = fs.mkdtempSync(path.join(require('os').tmpdir(), 'plugins-'));
+  const pluginFile = path.join(dir, 'test.plugin.js');
+  fs.writeFileSync(
+    pluginFile,
+    "module.exports = { onParseMarkdown: ({ content }) => ({ content: content + '!!' }) };\n"
+  );
+
+  const plugins = loadPlugins({ pluginsDir: dir, plugins: ['test.plugin'] });
+  let data = { content: 'hello' };
+  for (const plugin of plugins) {
+    if (typeof plugin.onParseMarkdown === 'function') {
+      const res = await plugin.onParseMarkdown(data);
+      if (res !== undefined) data = res;
+    }
+  }
+  expect(data.content).toBe('hello!!');
+  fs.rmSync(dir, { recursive: true, force: true });
+});