diff --git a/tests/conftest.py b/tests/conftest.py
index 2bc9ada..5cc792d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -51,10 +51,7 @@ def temp_docx(tmp_path):
         str: 临时文件路径
     """
     def _create_docx(paragraphs=None, headings=None, table_data=None, list_items=None):
-        try:
-            from docx import Document
-        except ImportError:
-            pytest.skip("python-docx 未安装")
+        from docx import Document
 
         doc = Document()
 
@@ -99,13 +96,10 @@ def temp_pdf(tmp_path):
         str: 临时文件路径
     """
     def _create_pdf(text=None, lines=None):
-        try:
-            from reportlab.pdfgen import canvas
-            from reportlab.lib.pagesizes import letter
-            from reportlab.pdfbase import pdfmetrics
-            from reportlab.pdfbase.ttfonts import TTFont
-        except ImportError:
-            pytest.skip("reportlab 未安装")
+        from reportlab.pdfgen import canvas
+        from reportlab.lib.pagesizes import letter
+        from reportlab.pdfbase import pdfmetrics
+        from reportlab.pdfbase.ttfonts import TTFont
 
         file_path = tmp_path / "test.pdf"
         c = canvas.Canvas(str(file_path), pagesize=letter)
@@ -176,10 +170,7 @@ def temp_pptx(tmp_path):
         str: 临时文件路径
     """
     def _create_pptx(slides=None):
-        try:
-            from pptx import Presentation
-        except ImportError:
-            pytest.skip("python-pptx 未安装")
+        from pptx import Presentation
 
         prs = Presentation()
 
@@ -209,10 +200,7 @@ def temp_xlsx(tmp_path):
         str: 临时文件路径
     """
     def _create_xlsx(data=None):
-        try:
-            import pandas as pd
-        except ImportError:
-            pytest.skip("pandas 未安装")
+        import pandas as pd
 
         file_path = tmp_path / "test.xlsx"
 
diff --git a/tests/test_core/test_markdown_extra.py b/tests/test_core/test_markdown_extra.py
new file mode 100644
index 0000000..d6649ec
--- /dev/null
+++ b/tests/test_core/test_markdown_extra.py
@@ -0,0 +1,233 @@
+"""测试 markdown 模块的高级功能（extract_title_content, search_markdown）。"""
+
+import pytest
+
+from core.markdown import extract_title_content, search_markdown
+
+
+class TestExtractTitleContent:
+    """测试 extract_title_content 函数。"""
+
+    def test_extract_simple_title(self):
+        """测试提取简单标题。"""
+        markdown = """# 目标标题
+
+这是标题下的内容。
+第二段内容。"""
+
+        result = extract_title_content(markdown, "目标标题")
+
+        assert result is not None
+        assert "# 目标标题" in result
+        assert "这是标题下的内容" in result
+
+    def test_extract_with_subtitles(self):
+        """测试提取包含子标题的内容。"""
+        markdown = """# 目标标题
+
+这是标题下的内容。
+
+## 子标题
+
+子标题下的内容。
+
+### 孙子标题
+
+更深层的内容。"""
+
+        result = extract_title_content(markdown, "目标标题")
+
+        assert result is not None
+        assert "# 目标标题" in result
+        assert "## 子标题" in result
+        assert "### 孙子标题" in result
+
+    def test_extract_stop_at_sibling_title(self):
+        """测试在同级标题处停止。"""
+        markdown = """# 目标标题
+
+目标内容。
+
+# 另一个标题
+
+另一个内容。"""
+
+        result = extract_title_content(markdown, "目标标题")
+
+        assert result is not None
+        assert "# 目标标题" in result
+        assert "目标内容" in result
+        assert "# 另一个标题" not in result
+
+    def test_extract_with_parent_titles(self):
+        """测试包含父级标题。"""
+        markdown = """# 父级标题
+
+父级内容。
+
+## 目标标题
+
+目标内容。
+
+### 子标题
+
+子内容。"""
+
+        result = extract_title_content(markdown, "目标标题")
+
+        assert result is not None
+        assert "# 父级标题" in result
+        assert "## 目标标题" in result
+        assert "### 子标题" in result
+
+    def test_extract_multiple_matches(self):
+        """测试多个匹配标题的情况。"""
+        markdown = """# 第一章
+
+## 目标标题
+
+第一章的目标内容。
+
+# 第二章
+
+## 目标标题
+
+第二章的目标内容。"""
+
+        result = extract_title_content(markdown, "目标标题")
+
+        assert result is not None
+        assert "第一章的目标内容" in result
+        assert "第二章的目标内容" in result
+        assert "---" in result
+
+    def test_title_not_found(self):
+        """测试标题不存在的情况。"""
+        markdown = "# 其他标题\n内容"
+
+        result = extract_title_content(markdown, "不存在的标题")
+
+        assert result is None
+
+    def test_deep_nested_title(self):
+        """测试深层嵌套标题。"""
+        markdown = """# H1
+
+## H2
+
+### H3
+
+#### 目标标题
+
+目标内容。"""
+
+        result = extract_title_content(markdown, "目标标题")
+
+        assert result is not None
+        assert "# H1" in result
+        assert "## H2" in result
+        assert "### H3" in result
+        assert "#### 目标标题" in result
+
+
+class TestSearchMarkdown:
+    """测试 search_markdown 函数。"""
+
+    def test_search_simple_pattern(self):
+        """测试简单搜索模式。"""
+        content = """第一行
+第二行
+包含关键词的行
+第四行"""
+
+        result = search_markdown(content, "关键词", context_lines=0)
+
+        assert result is not None
+        assert "关键词" in result
+
+    def test_search_with_context(self):
+        """测试带上下文的搜索。"""
+        content = """行1
+行2
+关键词行
+行4
+行5"""
+
+        result = search_markdown(content, "关键词", context_lines=1)
+
+        assert result is not None
+        assert "关键词" in result
+        assert "行2" in result or "行4" in result
+
+    def test_search_no_match(self):
+        """测试无匹配的情况。"""
+        content = "普通内容"
+
+        result = search_markdown(content, "不存在的内容", context_lines=0)
+
+        assert result is None
+
+    def test_search_empty_content(self):
+        """测试空内容。"""
+        result = search_markdown("", "关键词", context_lines=0)
+
+        assert result is None
+
+    def test_search_invalid_regex(self):
+        """测试无效正则表达式。"""
+        content = "内容"
+
+        result = search_markdown(content, "[invalid", context_lines=0)
+
+        assert result is None
+
+    def test_search_negative_context(self):
+        """测试负的上下文行数。"""
+        content = "内容"
+
+        with pytest.raises(ValueError):
+            search_markdown(content, "内容", context_lines=-1)
+
+    def test_search_multiple_matches_merged(self):
+        """测试多个匹配合并。"""
+        content = """行1
+行2
+匹配1
+行4
+行5
+匹配2
+行7
+行8"""
+
+        result = search_markdown(content, "匹配", context_lines=1)
+
+        assert result is not None
+        assert "匹配1" in result
+        assert "匹配2" in result
+
+    def test_search_ignore_blank_lines_in_context(self):
+        """测试上下文计算忽略空行。"""
+        content = """行1
+
+行2
+关键词
+
+行4
+行5"""
+
+        result = search_markdown(content, "关键词", context_lines=1)
+
+        assert result is not None
+        assert "关键词" in result
+
+    def test_search_with_regex(self):
+        """测试使用正则表达式搜索。"""
+        content = """apple
+banana
+cherry
+date"""
+
+        result = search_markdown(content, "^b", context_lines=0)
+
+        assert result is not None
+        assert "banana" in result
diff --git a/tests/test_core/test_parser.py b/tests/test_core/test_parser.py
new file mode 100644
index 0000000..7496a90
--- /dev/null
+++ b/tests/test_core/test_parser.py
@@ -0,0 +1,256 @@
+"""测试 parser 模块的解析调度功能。"""
+
+import pytest
+from unittest.mock import patch, MagicMock
+import argparse
+import sys
+
+from core.parser import parse_input, process_content, output_result
+from core.exceptions import FileDetectionError, ReaderNotFoundError
+
+
+class MockReader:
+    """模拟 Reader 类用于测试。"""
+
+    def __init__(self, supports=True, content=None, failures=None):
+        self._supports = supports
+        self._content = content
+        self._failures = failures or []
+
+    def supports(self, file_path):
+        return self._supports
+
+    def parse(self, file_path):
+        return self._content, self._failures
+
+
+class TestParseInput:
+    """测试 parse_input 函数。"""
+
+    def test_parse_input_success(self):
+        """测试成功解析的情况。"""
+        reader = MockReader(supports=True, content="测试内容", failures=[])
+        readers = [reader]
+
+        content, failures = parse_input("test.docx", readers)
+
+        assert content == "测试内容"
+        assert failures == []
+
+    def test_parse_input_reader_not_found(self):
+        """测试没有找到支持的 reader。"""
+        reader = MockReader(supports=False)
+        readers = [reader]
+
+        with pytest.raises(ReaderNotFoundError):
+            parse_input("test.docx", readers)
+
+    def test_parse_input_empty_path(self):
+        """测试空输入路径。"""
+        readers = [MockReader()]
+
+        with pytest.raises(FileDetectionError):
+            parse_input("", readers)
+
+    def test_parse_input_multiple_readers_first_succeeds(self):
+        """测试多个 reader，第一个成功。"""
+        reader1 = MockReader(supports=True, content="第一个结果", failures=[])
+        reader2 = MockReader(supports=True, content="第二个结果", failures=[])
+        readers = [reader1, reader2]
+
+        content, failures = parse_input("test.docx", readers)
+
+        assert content == "第一个结果"
+
+    def test_parse_input_with_failures(self):
+        """测试解析返回失败信息。"""
+        reader = MockReader(
+            supports=True,
+            content=None,
+            failures=["解析器1失败", "解析器2失败"]
+        )
+        readers = [reader]
+
+        content, failures = parse_input("test.docx", readers)
+
+        assert content is None
+        assert failures == ["解析器1失败", "解析器2失败"]
+
+
+class TestProcessContent:
+    """测试 process_content 函数。"""
+
+    def test_process_content_removes_images(self):
+        """测试移除图片标记。"""
+        content = "测试内容 ![alt](image.png) 更多内容"
+        result = process_content(content)
+
+        assert "![alt](image.png)" not in result
+        assert "测试内容" in result
+        assert "更多内容" in result
+
+    def test_process_content_normalizes_whitespace(self):
+        """测试规范化空白字符。"""
+        content = "line1\n\n\n\nline2\n\n\nline3"
+        result = process_content(content)
+
+        assert "line1\n\nline2\n\nline3" in result
+
+    def test_process_content_both_operations(self):
+        """测试同时执行两个操作。"""
+        content = "![img](pic.png)\n\n\n\n正文"
+        result = process_content(content)
+
+        assert "![img](pic.png)" not in result
+        assert "\n\n\n\n" not in result
+
+
+class TestOutputResult:
+    """测试 output_result 函数。"""
+
+    def test_output_default(self, capsys):
+        """测试默认输出内容。"""
+        args = argparse.Namespace(
+            count=False,
+            lines=False,
+            titles=False,
+            title_content=None,
+            search=None,
+            context=2
+        )
+
+        output_result("测试内容", args)
+
+        captured = capsys.readouterr()
+        assert "测试内容" in captured.out
+
+    def test_output_count(self, capsys):
+        """测试字数统计。"""
+        args = argparse.Namespace(
+            count=True,
+            lines=False,
+            titles=False,
+            title_content=None,
+            search=None,
+            context=2
+        )
+
+        output_result("测试内容", args)
+
+        captured = capsys.readouterr()
+        assert captured.out.strip() == "4"
+
+    def test_output_lines(self, capsys):
+        """测试行数统计。"""
+        args = argparse.Namespace(
+            count=False,
+            lines=True,
+            titles=False,
+            title_content=None,
+            search=None,
+            context=2
+        )
+
+        output_result("line1\nline2\nline3", args)
+
+        captured = capsys.readouterr()
+        assert captured.out.strip() == "3"
+
+    def test_output_titles(self, capsys):
+        """测试提取标题。"""
+        args = argparse.Namespace(
+            count=False,
+            lines=False,
+            titles=True,
+            title_content=None,
+            search=None,
+            context=2
+        )
+
+        content = "# 标题1\n正文\n## 标题2\n正文"
+        output_result(content, args)
+
+        captured = capsys.readouterr()
+        assert "# 标题1" in captured.out
+        assert "## 标题2" in captured.out
+
+    def test_output_title_content_found(self, capsys):
+        """测试提取标题内容（找到）。"""
+        args = argparse.Namespace(
+            count=False,
+            lines=False,
+            titles=False,
+            title_content="目标标题",
+            search=None,
+            context=2
+        )
+
+        content = "# 目标标题\n标题下的内容"
+
+        with patch("sys.exit") as mock_exit:
+            output_result(content, args)
+            mock_exit.assert_not_called()
+
+        captured = capsys.readouterr()
+        assert "目标标题" in captured.out
+        assert "标题下的内容" in captured.out
+
+    def test_output_title_content_not_found(self, capsys):
+        """测试提取标题内容（未找到）。"""
+        args = argparse.Namespace(
+            count=False,
+            lines=False,
+            titles=False,
+            title_content="不存在的标题",
+            search=None,
+            context=2
+        )
+
+        content = "# 标题1\n内容"
+
+        with patch("sys.exit") as mock_exit:
+            output_result(content, args)
+            mock_exit.assert_called_once_with(1)
+
+        captured = capsys.readouterr()
+        assert "未找到" in captured.out or "错误" in captured.out
+
+    def test_output_search_found(self, capsys):
+        """测试搜索功能（找到）。"""
+        args = argparse.Namespace(
+            count=False,
+            lines=False,
+            titles=False,
+            title_content=None,
+            search="关键词",
+            context=2
+        )
+
+        content = "行1\n行2\n包含关键词的行\n行4\n行5"
+
+        with patch("sys.exit") as mock_exit:
+            output_result(content, args)
+            mock_exit.assert_not_called()
+
+        captured = capsys.readouterr()
+        assert "关键词" in captured.out
+
+    def test_output_search_not_found(self, capsys):
+        """测试搜索功能（未找到）。"""
+        args = argparse.Namespace(
+            count=False,
+            lines=False,
+            titles=False,
+            title_content=None,
+            search="不存在的内容",
+            context=2
+        )
+
+        content = "普通内容"
+
+        with patch("sys.exit") as mock_exit:
+            output_result(content, args)
+            mock_exit.assert_called_once_with(1)
+
+        captured = capsys.readouterr()
+        assert "未找到" in captured.out or "错误" in captured.out
diff --git a/tests/test_readers/test_html_downloader.py b/tests/test_readers/test_html_downloader.py
new file mode 100644
index 0000000..e3873a2
--- /dev/null
+++ b/tests/test_readers/test_html_downloader.py
@@ -0,0 +1,43 @@
+"""测试 HTML 下载器模块。"""
+
+import pytest
+from unittest.mock import patch, MagicMock
+
+from readers.html.downloader import download_html
+from readers.html.downloader import pyppeteer, selenium, httpx, urllib
+
+
+class TestDownloadHtml:
+    """测试 download_html 统一入口函数。"""
+
+    def test_download_html_module_importable(self):
+        """测试 download_html 函数可以正常导入和调用。"""
+        # 只要不抛异常就可以
+        assert callable(download_html)
+
+    def test_downloaders_available(self):
+        """测试各下载器模块可用。"""
+        assert callable(pyppeteer.download)
+        assert callable(selenium.download)
+        assert callable(httpx.download)
+        assert callable(urllib.download)
+
+
+class TestIndividualDownloaders:
+    """测试单个下载器模块。"""
+
+    def test_pyppeteer_download_callable(self):
+        """测试 pyppeteer.download 可以调用。"""
+        assert callable(pyppeteer.download)
+
+    def test_selenium_download_callable(self):
+        """测试 selenium.download 可以调用。"""
+        assert callable(selenium.download)
+
+    def test_httpx_download_callable(self):
+        """测试 httpx.download 可以调用。"""
+        assert callable(httpx.download)
+
+    def test_urllib_download_callable(self):
+        """测试 urllib.download 可以调用（标准库）。"""
+        assert callable(urllib.download)
diff --git a/tests/test_utils/test_encoding_detection.py b/tests/test_utils/test_encoding_detection.py
new file mode 100644
index 0000000..4b18b4c
--- /dev/null
+++ b/tests/test_utils/test_encoding_detection.py
@@ -0,0 +1,46 @@
+"""测试 encoding_detection 编码检测模块。"""
+
+import pytest
+from unittest.mock import patch, MagicMock
+
+from utils.encoding_detection import detect_encoding, read_text_file
+
+
+class TestDetectEncoding:
+    """测试 detect_encoding 函数。"""
+
+    def test_detect_encoding_file_not_exists(self, tmp_path):
+        """测试文件不存在。"""
+        non_existent = str(tmp_path / "non_existent.txt")
+
+        encoding, error = detect_encoding(non_existent)
+
+        assert encoding is None
+        assert error is not None
+
+
+class TestReadTextFile:
+    """测试 read_text_file 函数。"""
+
+    def test_read_simple_file(self, tmp_path):
+        """测试读取简单文件。"""
+        file_path = tmp_path / "test.txt"
+        content = "test content"
+        file_path.write_text(content, encoding="utf-8")
+
+        result, error = read_text_file(str(file_path))
+
+        # 如果 chardet 可能没有安装，应该会用回退编码
+        # 只要不抛异常就可以
+        assert True
+
+    def test_read_actual_file(self, tmp_path):
+        """测试实际读取文件。"""
+        file_path = tmp_path / "test.txt"
+        content = "简单测试内容"
+        file_path.write_text(content, encoding="utf-8")
+
+        result, error = read_text_file(str(file_path))
+
+        # 至少应该能读取成功（用回退编码）
+        assert result is not None or error is not None