diff --git a/app/test/config.test.js b/app/test/config.test.js
index d67f54e..c41bed6 100644
--- a/app/test/config.test.js
+++ b/app/test/config.test.js
@@ -10,15 +10,25 @@ const {
     loadConfig,
 } = require('../config');
 
-test('isUnset 將 undefined/空字串/null 字面值視為未設定', () => {
+test('isUnset 對 undefined/null/空字串/字面 "null" 視為未設定', () => {
     assert.equal(isUnset(undefined), true);
+    assert.equal(isUnset(null), true);
     assert.equal(isUnset(''), true);
     assert.equal(isUnset('null'), true);
-    assert.equal(isUnset('value'), false);
 });
 
-test('requireEnv 未設定時拋錯，有值時回傳原值', () => {
+test('isUnset 對其他非空值視為已設定', () => {
+    assert.equal(isUnset('value'), false);
+    assert.equal(isUnset('false'), false);
+    assert.equal(isUnset('0'), false);
+});
+
+test('requireEnv 未設定時拋錯', () => {
     assert.throws(() => requireEnv('FOO', ''), /FOO 未設定/);
+    assert.throws(() => requireEnv('FOO', undefined), /FOO 未設定/);
+});
+
+test('requireEnv 有值時回傳原值', () => {
     assert.equal(requireEnv('FOO', 'bar'), 'bar');
 });
 
@@ -73,3 +83,22 @@ test('loadConfig 於 GITEA_SERVER_URL 使用非 http(s) 協定時拋錯', () =>
         GITEA_REPOSITORY: 'owner/repo',
     }), /必須使用 http 或 https/);
 });
+
+test('loadConfig 於 GITEA_REPOSITORY 格式錯誤或含路徑穿越時拋錯', () => {
+    assert.throws(() => loadConfig({
+        GITEA_SERVER_URL: 'https://gitea.example.com',
+        GITEA_REPOSITORY: '../evil',
+    }), /GITEA_REPOSITORY 格式錯誤/);
+    assert.throws(() => loadConfig({
+        GITEA_SERVER_URL: 'https://gitea.example.com',
+        GITEA_REPOSITORY: 'owner/repo/extra',
+    }), /GITEA_REPOSITORY 格式錯誤/);
+});
+
+test('loadConfig 接受含點號的合法 owner/repo', () => {
+    const config = loadConfig({
+        GITEA_SERVER_URL: 'https://gitea.example.com',
+        GITEA_REPOSITORY: 'my.org/my.repo',
+    });
+    assert.equal(config.repository, 'my.org/my.repo');
+});
diff --git a/app/test/logger.test.js b/app/test/logger.test.js
new file mode 100644
index 0000000..390b4dc
--- /dev/null
+++ b/app/test/logger.test.js
@@ -0,0 +1,55 @@
+'use strict';
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const logger = require('../logger');
+
+// 暫時攔截 process.stdout.write，回傳期間內寫出的內容
+function captureStdout(fn) {
+    const original = process.stdout.write;
+    let out = '';
+    process.stdout.write = (chunk) => { out += chunk; return true; };
+    try {
+        fn();
+    } finally {
+        process.stdout.write = original;
+    }
+    return out;
+}
+
+// 暫時攔截 process.stderr.write，回傳期間內寫出的內容
+function captureStderr(fn) {
+    const original = process.stderr.write;
+    let out = '';
+    process.stderr.write = (chunk) => { out += chunk; return true; };
+    try {
+        fn();
+    } finally {
+        process.stderr.write = original;
+    }
+    return out;
+}
+
+test('section 以主/次分隔線包夾標題輸出至 stdout', () => {
+    const out = captureStdout(() => logger.section('參數檢查'));
+    const line = '='.repeat(50);
+    const subline = '-'.repeat(50);
+    assert.equal(out, `\n${line}\n參數檢查\n${subline}\n`);
+});
+
+test('info 以 [info] 前綴與換行輸出至 stdout', () => {
+    const out = captureStdout(() => logger.info('IS_BETA=false'));
+    assert.equal(out, '[info] IS_BETA=false\n');
+});
+
+test('error 以 [error] 前綴與換行輸出至 stderr', () => {
+    const out = captureStderr(() => logger.error('GITEA_SERVER_URL 未設定'));
+    assert.equal(out, '[error] GITEA_SERVER_URL 未設定\n');
+});
+
+test('error 僅輸出不終止行程，呼叫後仍可繼續執行', () => {
+    let reached = false;
+    captureStderr(() => { logger.error('still alive'); reached = true; });
+    assert.equal(reached, true);
+});
diff --git a/app/test/version.test.js b/app/test/version.test.js
index f24e040..13fdc43 100644
--- a/app/test/version.test.js
+++ b/app/test/version.test.js
@@ -18,6 +18,7 @@ const rel = (tag) => ({ tag_name: tag });
 test('compareVersionArrays 逐區段比較且較短者較小', () => {
     assert.ok(compareVersionArrays([1, 10], [1, 2, 3]) > 0);
     assert.ok(compareVersionArrays([1, 2], [1, 2, 0]) < 0);
+    assert.ok(compareVersionArrays([2, 0, 0], [1, 9, 9]) > 0);
     assert.equal(compareVersionArrays([1, 2, 3], [1, 2, 3]), 0);
 });