chore: checkpoint baseline (routers, tests, pyproject)

tests/test_downloader.py

@@ -0,0 +1,47 @@
+"""Tests for downloader module."""
+
+import hashlib
+
+from src.config import DownloadConfig, RateLimitConfig
+from src.downloader import Downloader
+
+
+class TestDownloader:
+    def test_compute_hash(self, tmp_path):
+        config = DownloadConfig(output_dir=str(tmp_path))
+        rate = RateLimitConfig(download_delay_seconds=0)
+        downloader = Downloader(config, rate)
+
+        test_file = tmp_path / "test.txt"
+        test_file.write_bytes(b"hello world")
+
+        file_hash = downloader.compute_hash(str(test_file))
+        expected = hashlib.md5(b"hello world").hexdigest()
+        assert file_hash == expected
+
+    def test_get_extension_from_url(self, tmp_path):
+        config = DownloadConfig(output_dir=str(tmp_path))
+        rate = RateLimitConfig(download_delay_seconds=0)
+        downloader = Downloader(config, rate)
+
+        assert downloader._get_extension("https://example.com/image.jpg", None) == ".jpg"
+        assert downloader._get_extension("https://example.com/image.png", None) == ".png"
+        assert downloader._get_extension("https://example.com/video.mp4", None) == ".mp4"
+
+    def test_get_extension_from_content_type(self, tmp_path):
+        config = DownloadConfig(output_dir=str(tmp_path))
+        rate = RateLimitConfig(download_delay_seconds=0)
+        downloader = Downloader(config, rate)
+
+        assert downloader._get_extension("https://example.com/blah", "image/jpeg") == ".jpg"
+        assert downloader._get_extension("https://example.com/blah", "image/png") == ".png"
+        assert downloader._get_extension("https://example.com/blah", "video/mp4") == ".mp4"
+
+    def test_sanitize_name(self, tmp_path):
+        config = DownloadConfig(output_dir=str(tmp_path))
+        rate = RateLimitConfig(download_delay_seconds=0)
+        downloader = Downloader(config, rate)
+
+        assert downloader._sanitize_name("normal_name") == "normal_name"
+        assert downloader._sanitize_name("has spaces!@#") == "has_spaces___"
+        assert downloader._sanitize_name("with-dash") == "with-dash"