extract image proxying from FeedUtils

commafeed-server/src/test/java/com/commafeed/backend/feed/ImageProxyUrlTest.java

@@ -0,0 +1,57 @@
+package com.commafeed.backend.feed;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class ImageProxyUrlTest {
+
+	@ParameterizedTest
+	@ValueSource(
+			strings = {
+					// simple URL
+					"http://example.com/image.jpg",
+
+					// URL with query parameters
+					"https://example.com/image.png?width=100&height=200",
+
+					// URL with special characters
+					"https://example.com/path/image.gif?param=value&other=test#fragment",
+
+					// URL with non-ascii characters
+					"https://example.com/image-ñáéíóú.jpg",
+
+					// blank URL
+					"",
+
+					// URL with port number
+					"http://localhost:8080/images/photo.jpg",
+
+					// long URL
+					"https://very-long-domain-name-example.com/very/long/path/to/image/file/with/many/segments/image.jpg?param1=value1&param2=value2&param3=value3",
+
+					// URL with mixed case
+					"HTTPS://EXAMPLE.COM/Image.JPG",
+
+					// URL with port number
+					"https://example123.com/image123.jpg?id=456789", })
+	void testEncodingDecoding(String originalUrl) {
+		String encoded = ImageProxyUrl.encode(originalUrl);
+		String decoded = ImageProxyUrl.decode(encoded);
+
+		Assertions.assertEquals(originalUrl, decoded);
+	}
+
+	@Test
+	void encodeProducesDifferentResultForDifferentUrls() {
+		String url1 = "https://example.com/image1.jpg";
+		String url2 = "https://example.com/image2.jpg";
+
+		String encoded1 = ImageProxyUrl.encode(url1);
+		String encoded2 = ImageProxyUrl.encode(url2);
+
+		Assertions.assertNotEquals(encoded1, encoded2);
+	}
+
+}