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#!/usr/bin/env python3
"""Unit tests for image preprocessor service"""
import unittest
from unittest.mock import Mock, patch, MagicMock
import sys
import os
import io
from PIL import Image
# Add the app directory to the path
sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', '..', 'app'))
from services.image_preprocessor import ImagePreprocessor
class TestImagePreprocessor(unittest.TestCase):
"""Test cases for image preprocessor service"""
def setUp(self):
"""Set up test fixtures"""
self.preprocessor = ImagePreprocessor()
# Create a simple test image
self.test_image = Image.new('RGB', (100, 100), color='red')
self.test_image_bytes = io.BytesIO()
self.test_image.save(self.test_image_bytes, format='JPEG')
self.test_image_bytes.seek(0)
def test_detect_mime_type_jpeg(self):
"""Test MIME type detection for JPEG"""
# Arrange
image_data = self.test_image_bytes.getvalue()
filename = "test.jpg"
# Act
mime_type = self.preprocessor.detect_mime_type(image_data, filename)
# Assert
self.assertEqual(mime_type, "image/jpeg")
def test_detect_mime_type_png(self):
"""Test MIME type detection for PNG"""
# Arrange
png_image = Image.new('RGB', (50, 50), color='blue')
png_bytes = io.BytesIO()
png_image.save(png_bytes, format='PNG')
png_bytes.seek(0)
image_data = png_bytes.getvalue()
filename = "test.png"
# Act
mime_type = self.preprocessor.detect_mime_type(image_data, filename)
# Assert
self.assertEqual(mime_type, "image/png")
def test_detect_mime_type_unknown(self):
"""Test MIME type detection for unknown file"""
# Arrange
unknown_data = b"not an image"
filename = "test.unknown"
# Act
mime_type = self.preprocessor.detect_mime_type(unknown_data, filename)
# Assert
self.assertEqual(mime_type, "application/octet-stream")
def test_needs_preprocessing_jpeg(self):
"""Test preprocessing check for JPEG (should not need preprocessing)"""
# Act
needs_preprocessing = self.preprocessor.needs_preprocessing("image/jpeg")
# Assert
self.assertFalse(needs_preprocessing)
def test_needs_preprocessing_png(self):
"""Test preprocessing check for PNG (should not need preprocessing)"""
# Act
needs_preprocessing = self.preprocessor.needs_preprocessing("image/png")
# Assert
self.assertFalse(needs_preprocessing)
def test_needs_preprocessing_pdf(self):
"""Test preprocessing check for PDF (should need preprocessing)"""
# Act
needs_preprocessing = self.preprocessor.needs_preprocessing("application/pdf")
# Assert
self.assertTrue(needs_preprocessing)
def test_needs_preprocessing_heic(self):
"""Test preprocessing check for HEIC (should need preprocessing)"""
# Act
needs_preprocessing = self.preprocessor.needs_preprocessing("image/heic")
# Assert
self.assertTrue(needs_preprocessing)
def test_preprocess_image_success(self):
"""Test successful image preprocessing"""
# Arrange
image_data = self.test_image_bytes.getvalue()
filename = "test.jpg"
# Act
result = self.preprocessor.preprocess_image(image_data, filename)
# Assert
self.assertIsInstance(result, tuple)
self.assertEqual(len(result), 3)
processed_content, new_filename, mime_type = result
self.assertIsInstance(processed_content, bytes)
self.assertIsInstance(new_filename, str)
self.assertIsInstance(mime_type, str)
def test_preprocess_image_png_format(self):
"""Test image preprocessing with PNG format"""
# Arrange
image_data = self.test_image_bytes.getvalue()
filename = "test.jpg"
# Act
result = self.preprocessor.preprocess_image(image_data, filename, target_format='PNG')
# Assert
processed_content, new_filename, mime_type = result
self.assertIsInstance(processed_content, bytes)
self.assertIsInstance(new_filename, str)
self.assertGreater(len(new_filename), 0)
def test_preprocess_image_jpeg_quality(self):
"""Test image preprocessing with JPEG quality setting"""
# Arrange
image_data = self.test_image_bytes.getvalue()
filename = "test.jpg"
# Act
result = self.preprocessor.preprocess_image(image_data, filename, target_format='JPEG', quality=80)
# Assert
processed_content, new_filename, mime_type = result
self.assertIsInstance(processed_content, bytes)
self.assertIn('.jpg', new_filename.lower())
def test_supported_mime_types(self):
"""Test that supported MIME types are defined"""
# Assert
self.assertIsInstance(self.preprocessor.SUPPORTED_IMAGE_MIME_TYPES, set)
self.assertIn('image/jpeg', self.preprocessor.SUPPORTED_IMAGE_MIME_TYPES)
self.assertIn('image/png', self.preprocessor.SUPPORTED_IMAGE_MIME_TYPES)
self.assertIn('application/pdf', self.preprocessor.SUPPORTED_IMAGE_MIME_TYPES)
def test_fitz_availability(self):
"""Test PyMuPDF availability flag"""
# Assert
self.assertIsInstance(self.preprocessor.FITZ_AVAILABLE, bool)
def test_configuration_constants(self):
"""Test that configuration constants are defined"""
# Assert
self.assertIsInstance(self.preprocessor.PDF_ZOOM_FACTOR, float)
self.assertIsInstance(self.preprocessor.PDF_COMPRESS_LEVEL, int)
self.assertIsInstance(self.preprocessor.PDF_QUALITY_MODE, str)
if __name__ == '__main__':
unittest.main()
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