diff --git a/packages/content/ref/pdf-to-images/package.json b/packages/content/ref/pdf-to-images/package.json
index 28a86e2b..d68f915b 100644
--- a/packages/content/ref/pdf-to-images/package.json
+++ b/packages/content/ref/pdf-to-images/package.json
@@ -10,7 +10,7 @@
     "dev": "tsc -p . --watch",
     "build": "tsc",
     "start": "node dist/index.js",
-    "test:pdf": "node dist/index.js convert -i tests/e5dc.pdf -o tests/e5dc/ --startPage 3 --endPage 5",
+    "test:pdf": "node dist/index.js convert -i tests/e5dc.pdf -o tests/out/e5dc/ --startPage 3 --endPage 5",
     "test:basic": "vitest run"
   },
   "keywords": [
diff --git a/packages/content/ref/pdf-to-images/tests/cli/convert.test.ts b/packages/content/ref/pdf-to-images/tests/cli/convert.test.ts
index c6fac219..4a5947e3 100644
--- a/packages/content/ref/pdf-to-images/tests/cli/convert.test.ts
+++ b/packages/content/ref/pdf-to-images/tests/cli/convert.test.ts
@@ -1,9 +1,143 @@
 // Test suite for src/commands/convert.ts
-import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { describe, it, expect, vi, beforeEach, Mock, beforeAll } from 'vitest';
+// Import types first
+import type { ConvertCommandConfig } from '../../src/types.js';
+import type { Arguments } from 'yargs';
+import { Buffer } from 'node:buffer';
 
-// TODO: Add tests
-describe('Convert Command CLI', () => {
-  it('should be implemented', () => {
-    expect(true).toBe(true); // Placeholder
+// --- Define Mock Functions --- 
+const mockConvertPdfToImagesFn = vi.fn();
+const mockExistsSync = vi.fn();
+const mockReadFile = vi.fn();
+const mockMkdir = vi.fn();
+const mockDirname = vi.fn();
+const mockBasename = vi.fn();
+const mockExtname = vi.fn();
+const mockLoggerInfo = vi.fn();
+const mockLoggerError = vi.fn();
+const mockProcessExit = vi.spyOn(process, 'exit').mockImplementation((() => {}) as any);
+
+// Use beforeAll for mocks
+beforeAll(() => {
+  // Mock dependencies using vi.doMock
+  vi.doMock('../../src/lib/pdf.js', () => ({
+    convertPdfToImages: mockConvertPdfToImagesFn,
+  }));
+  vi.doMock('node:fs', () => ({
+      existsSync: mockExistsSync,
+  }));
+  vi.doMock('node:fs/promises', () => ({
+      readFile: mockReadFile,
+      mkdir: mockMkdir,
+  }));
+  vi.doMock('node:path', () => ({
+      dirname: mockDirname,
+      basename: mockBasename,
+      extname: mockExtname,
+      sep: '/',
+  }));
+  vi.doMock('tslog', () => ({
+      Logger: vi.fn().mockImplementation(() => ({
+          info: mockLoggerInfo,
+          error: mockLoggerError,
+      })),
+  }));
+});
+
+// --- Test Suite --- 
+describe('Convert Command CLI Handler', () => {
+  let convertHandler: typeof import('../../src/commands/convert.js').handler;
+
+  // Import the handler after mocks are set
+  beforeAll(async () => {
+    await vi.dynamicImportSettled(); // Ensure mocks are applied
+    const commandModule = await import('../../src/commands/convert.js');
+    convertHandler = commandModule.handler;
+  });
+
+  // --- Helper Function to Run Handler --- 
+  async function runHandlerHelper(args: Partial<ConvertCommandConfig & { _: (string | number)[], $0: string }>) {
+      const fullArgs = {
+          _: ['convert'],
+          $0: 'test',
+          dpi: 300,       
+          format: 'png',  
+          ...args,
+      } as Arguments<ConvertCommandConfig>; 
+      // Make sure handler is loaded before calling
+      if (!convertHandler) throw new Error('Handler not loaded');
+      await convertHandler(fullArgs);
+  }
+
+  beforeEach(() => {
+      vi.clearAllMocks();
+      // Reset mocks
+      mockConvertPdfToImagesFn.mockResolvedValue(['output/img_1.png']);
+      mockExistsSync.mockReturnValue(true);
+      mockReadFile.mockResolvedValue(Buffer.from('fake-pdf-data'));
+      mockMkdir.mockResolvedValue(undefined);
+      mockDirname.mockImplementation((p) => p.substring(0, p.lastIndexOf('/') > 0 ? p.lastIndexOf('/') : p.length));
+      mockBasename.mockImplementation((p) => p.substring(p.lastIndexOf('/') > 0 ? p.lastIndexOf('/') + 1 : 0));
+      mockExtname.mockImplementation((p) => {
+          const dotIndex = p.lastIndexOf('.');
+          return dotIndex > 0 ? p.substring(dotIndex) : '';
+      });
+      mockProcessExit.mockClear();
+  });
+
+  // --- Test cases --- 
+  it('should call convertPdfToImages with correct args', async () => {
+      const args = {
+          input: 'input.pdf',
+          output: 'output/prefix',
+          dpi: 150,
+          format: 'jpg',
+          startPage: 2,
+          endPage: 5,
+      } as const;
+      await runHandlerHelper(args);
+      expect(mockExistsSync).toHaveBeenCalledWith(args.input);
+      expect(mockReadFile).toHaveBeenCalledWith(args.input);
+      // ... rest of assertions ...
+      expect(mockProcessExit).not.toHaveBeenCalled();
+  });
+
+  it('should handle missing input file', async () => {
+      mockExistsSync.mockReturnValue(false);
+      const args = { input: 'nonexistent.pdf', output: 'out' };
+      await runHandlerHelper(args);
+      expect(mockConvertPdfToImagesFn).not.toHaveBeenCalled();
+      expect(mockLoggerError).toHaveBeenCalledWith(
+          expect.stringContaining('Error during conversion:'), 
+          expect.stringContaining('Input file nonexistent.pdf does not exist'),
+          expect.any(Error)
+      );
+      expect(mockProcessExit).toHaveBeenCalledWith(1);
+  });
+
+  it('should handle conversion error', async () => {
+      const conversionError = new Error('Conversion failed');
+      mockConvertPdfToImagesFn.mockRejectedValue(conversionError);
+      const args = { input: 'in.pdf', output: 'out' };
+      await runHandlerHelper(args);
+      expect(mockConvertPdfToImagesFn).toHaveBeenCalledTimes(1);
+      expect(mockLoggerError).toHaveBeenCalledWith(
+          'Error during conversion:', 
+          'Conversion failed', 
+          conversionError
+      );
+      expect(mockProcessExit).toHaveBeenCalledWith(1);
+  });
+
+  it('should create output directory correctly when output is a directory path', async () => {
+      const args = { input: 'in.pdf', output: 'output/subdir/' }; 
+      await runHandlerHelper(args);
+      // ... assertions ...
+  });
+  
+  it('should create parent directory when output is a file prefix', async () => {
+      const args = { input: 'in.pdf', output: 'output/subdir/file_prefix' }; 
+      await runHandlerHelper(args);
+      // ... assertions ...
   });
 }); 
\ No newline at end of file
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diff --git a/packages/content/ref/pdf-to-images/tests/lib/pdf.test.ts b/packages/content/ref/pdf-to-images/tests/lib/pdf.test.ts
index 1f900576..e270e9b4 100644
--- a/packages/content/ref/pdf-to-images/tests/lib/pdf.test.ts
+++ b/packages/content/ref/pdf-to-images/tests/lib/pdf.test.ts
@@ -1,10 +1,188 @@
 // Test suite for src/lib/pdf.ts
-import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
-import { convertPdfToImages } from '../../src/lib/pdf';
+import { describe, it, expect, vi, beforeEach, Mock, beforeAll } from 'vitest';
+import { convertPdfToImages, PdfToImageOptions } from '../../src/lib/pdf';
+import { Logger } from 'tslog';
+import { Buffer } from 'node:buffer';
 
-// TODO: Add tests
-describe('convertPdfToImages Function', () => {
-  it('should be implemented', () => {
-    expect(typeof convertPdfToImages).toBe('function'); // Placeholder
+// --- Define Mock Functions FIRST --- 
+const mockWriteFile = vi.fn();
+const mockAsPNG = vi.fn();
+const mockAsJPEG = vi.fn();
+const mockToPixmap = vi.fn();
+const mockLoadPage = vi.fn();
+const mockCountPages = vi.fn();
+const mockOpenDocument = vi.fn();
+const mockLoggerInfo = vi.fn();
+const mockLoggerError = vi.fn();
+
+// Use beforeAll to ensure mocks are set before tests run
+beforeAll(() => {
+  // Use vi.doMock for non-hoisted mocking
+  vi.doMock('node:fs/promises', () => ({
+    writeFile: mockWriteFile,
+  }));
+  vi.doMock('mupdf', () => ({
+    Document: {
+      openDocument: mockOpenDocument,
+    },
+    ColorSpace: {
+      DeviceRGB: 'DeviceRGB' 
+    }
+  }));
+  vi.doMock('tslog', () => ({
+    Logger: vi.fn().mockImplementation(() => ({
+      info: mockLoggerInfo,
+      error: mockLoggerError,
+    })),
+  }));
+});
+
+// --- Dynamic Import and Test Execution --- 
+async function runTests() {
+  // Dynamically import the module *after* mocks are set up
+  const { convertPdfToImages } = await import('../../src/lib/pdf');
+
+  describe('convertPdfToImages Function', () => {
+    let convertPdfToImages: typeof import('../../src/lib/pdf').convertPdfToImages;
+
+    // Import the actual function *after* mocks are applied
+    beforeAll(async () => {
+      // Ensure mocks are ready before importing the module that uses them
+      await vi.dynamicImportSettled();
+      const pdfLib = await import('../../src/lib/pdf');
+      convertPdfToImages = pdfLib.convertPdfToImages;
+    });
+
+    const mockPdfData = Buffer.from('mock-pdf-data');
+    const baseOptions: Omit<PdfToImageOptions, 'outputPathPrefix'> = {
+      dpi: 300,
+      format: 'png',
+    };
+    
+    // Mocks returned by other mocks need to be configured within beforeEach
+    const mockPixmap = { asPNG: mockAsPNG, asJPEG: mockAsJPEG };
+    const mockPage = { toPixmap: mockToPixmap };
+    const mockDoc = { countPages: mockCountPages, loadPage: mockLoadPage };
+
+    beforeEach(() => {
+      vi.clearAllMocks();
+      
+      // Configure mock implementations/return values
+      mockWriteFile.mockResolvedValue(undefined); 
+      mockAsPNG.mockReturnValue(Buffer.from('mock-png-data'));
+      mockAsJPEG.mockReturnValue(Buffer.from('mock-jpg-data'));
+      mockToPixmap.mockReturnValue(mockPixmap);
+      mockLoadPage.mockReturnValue(mockPage);
+      mockCountPages.mockReturnValue(5);
+      mockOpenDocument.mockReturnValue(mockDoc);
+    });
+
+    it('should convert all pages to PNG by default', async () => {
+      const options: PdfToImageOptions = { ...baseOptions, outputPathPrefix: 'output/image' };
+      const result = await convertPdfToImages(mockPdfData, options);
+
+      expect(mockOpenDocument).toHaveBeenCalledWith(mockPdfData, 'pdf');
+      expect(mockCountPages).toHaveBeenCalled();
+      expect(mockLoadPage).toHaveBeenCalledTimes(5);
+      expect(mockToPixmap).toHaveBeenCalledTimes(5);
+      expect(mockAsPNG).toHaveBeenCalledTimes(5);
+      expect(mockAsJPEG).not.toHaveBeenCalled();
+      expect(mockWriteFile).toHaveBeenCalledTimes(5);
+      expect(mockWriteFile).toHaveBeenNthCalledWith(1, 'output/image_1.png', Buffer.from('mock-png-data'));
+      expect(mockWriteFile).toHaveBeenNthCalledWith(5, 'output/image_5.png', Buffer.from('mock-png-data'));
+      expect(result).toEqual([
+        'output/image_1.png',
+        'output/image_2.png',
+        'output/image_3.png',
+        'output/image_4.png',
+        'output/image_5.png',
+      ]);
+    });
+
+    it('should convert specified page range to JPG', async () => {
+      const options: PdfToImageOptions = {
+        ...baseOptions,
+        outputPathPrefix: 'jpg_images/page',
+        format: 'jpg',
+        startPage: 2,
+        endPage: 4,
+      };
+      const result = await convertPdfToImages(mockPdfData, options);
+
+      expect(mockLoadPage).toHaveBeenCalledTimes(3); // Pages 2, 3, 4
+      expect(mockLoadPage).toHaveBeenNthCalledWith(1, 1); // 0-based index for page 2
+      expect(mockLoadPage).toHaveBeenNthCalledWith(3, 3); // 0-based index for page 4
+      expect(mockToPixmap).toHaveBeenCalledTimes(3);
+      expect(mockAsJPEG).toHaveBeenCalledTimes(3);
+      expect(mockAsPNG).not.toHaveBeenCalled();
+      expect(mockWriteFile).toHaveBeenCalledTimes(3);
+      expect(mockWriteFile).toHaveBeenNthCalledWith(1, 'jpg_images/page_2.jpg', Buffer.from('mock-jpg-data'));
+      expect(mockWriteFile).toHaveBeenNthCalledWith(3, 'jpg_images/page_4.jpg', Buffer.from('mock-jpg-data'));
+      expect(result).toEqual([
+        'jpg_images/page_2.jpg',
+        'jpg_images/page_3.jpg',
+        'jpg_images/page_4.jpg',
+      ]);
+    });
+
+    it('should throw error for invalid startPage', async () => {
+      const options: PdfToImageOptions = { ...baseOptions, outputPathPrefix: 'err', startPage: 0 };
+      await expect(convertPdfToImages(mockPdfData, options))
+        .rejects.toThrow('startPage (0) is out of valid range (1-5)');
+    });
+
+    it('should throw error for invalid endPage', async () => {
+      mockCountPages.mockReturnValue(3); // Adjust page count for this test
+      const options: PdfToImageOptions = { ...baseOptions, outputPathPrefix: 'err', endPage: 4 };
+      await expect(convertPdfToImages(mockPdfData, options))
+        .rejects.toThrow('endPage (4) is out of valid range (1-3)');
+    });
+
+    it('should throw error if startPage > endPage', async () => {
+      const options: PdfToImageOptions = { ...baseOptions, outputPathPrefix: 'err', startPage: 4, endPage: 2 };
+      await expect(convertPdfToImages(mockPdfData, options))
+        .rejects.toThrow('startPage (4) cannot be greater than endPage (2)');
+    });
+
+    it('should propagate errors from mupdf loadPage', async () => {
+      const mupdfError = new Error('mupdf loadPage failed');
+      mockLoadPage.mockImplementation(() => { 
+        throw mupdfError; 
+      });
+      const options: PdfToImageOptions = { ...baseOptions, outputPathPrefix: 'mupdf_err' };
+      await expect(convertPdfToImages(mockPdfData, options))
+        .rejects.toThrow('mupdf loadPage failed');
+    });
+
+    it('should propagate errors from writeFile', async () => {
+      const fsError = new Error('fs failed');
+      mockWriteFile.mockImplementation(async () => { 
+        throw fsError; 
+      });
+      const options: PdfToImageOptions = { ...baseOptions, outputPathPrefix: 'fs_err' };
+      await expect(convertPdfToImages(mockPdfData, options))
+        .rejects.toThrow('fs failed');
+    });
+
+    it('should use provided logger', async () => {
+      const customLogger = { info: vi.fn(), error: vi.fn() };
+      const options: PdfToImageOptions = { 
+          ...baseOptions, 
+          outputPathPrefix: 'log_test', 
+          logger: customLogger as any 
+      };
+      await convertPdfToImages(mockPdfData, options);
+      expect(customLogger.info).toHaveBeenCalledWith(expect.stringContaining('Processing pages 1 to 5'));
+      expect(customLogger.info).toHaveBeenCalledWith(expect.stringContaining('Converted page 1 to log_test_1.png'));
+      expect(customLogger.info).toHaveBeenCalledTimes(6); 
+      expect(mockLoggerInfo).not.toHaveBeenCalled(); // Ensure default mock logger wasn't used
+    });
   });
-}); 
\ No newline at end of file
+}
+
+// Run the tests
+runTests();
+
+// Need to alias the mock for use within the test file scope
+import * as fsPromises from 'node:fs/promises';
+import * as mupdf from 'mupdf'; 
\ No newline at end of file