feat: image download, resize-to-fit, baseline JPEG conversion

Made-with: Cursor

tests/test_images.py

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+import os
+import pytest
+from io import BytesIO
+from unittest.mock import patch, MagicMock
+from PIL import Image as PILImage
+from src.images import process_image, _resize_to_fit
+
+
+def _make_test_image(width, height, fmt="JPEG"):
+    img = PILImage.new("RGB", (width, height), color="red")
+    buf = BytesIO()
+    img.save(buf, format=fmt)
+    buf.seek(0)
+    return buf.read()
+
+
+def test_resize_landscape_downscale():
+    img = PILImage.new("RGB", (1600, 900))
+    result = _resize_to_fit(img)
+    assert result.width <= 800
+    assert result.height <= 480
+    assert result.width / result.height == pytest.approx(1600 / 900, rel=0.02)
+
+
+def test_resize_portrait_downscale():
+    img = PILImage.new("RGB", (600, 1200))
+    result = _resize_to_fit(img)
+    assert result.width <= 480
+    assert result.height <= 800
+    assert result.width / result.height == pytest.approx(600 / 1200, rel=0.02)
+
+
+def test_resize_small_image_upscales():
+    img = PILImage.new("RGB", (200, 100))
+    result = _resize_to_fit(img)
+    assert result.width > 200
+    assert result.width <= 800
+    assert result.height <= 480
+
+
+def test_resize_already_fits():
+    img = PILImage.new("RGB", (800, 480))
+    result = _resize_to_fit(img)
+    assert result.size == (800, 480)
+
+
+def test_process_image_downloads_and_saves(tmp_path):
+    image_bytes = _make_test_image(1024, 768)
+
+    mock_response = MagicMock()
+    mock_response.content = image_bytes
+    mock_response.raise_for_status = MagicMock()
+
+    with patch("src.images.requests.get", return_value=mock_response):
+        path, w, h = process_image(
+            "https://example.com/photo.jpg", str(tmp_path)
+        )
+
+    assert os.path.exists(path)
+    assert path.endswith(".jpg")
+    assert w <= 800
+    assert h <= 480
+
+    saved = PILImage.open(path)
+    assert saved.format == "JPEG"
+
+
+def test_process_image_dedup(tmp_path):
+    image_bytes = _make_test_image(500, 300)
+
+    mock_response = MagicMock()
+    mock_response.content = image_bytes
+    mock_response.raise_for_status = MagicMock()
+
+    with patch("src.images.requests.get", return_value=mock_response) as mock_get:
+        path1, _, _ = process_image("https://example.com/same.jpg", str(tmp_path))
+        path2, _, _ = process_image("https://example.com/same.jpg", str(tmp_path))
+
+    assert path1 == path2
+    assert mock_get.call_count == 1