Add unit tests for ArticleExtractor.extractionURL(for:)

Tests verify Naver Blog URL transformation to mobile site,
query parameter stripping, and that non-Naver URLs pass through unchanged.

https://claude.ai/code/session_01DWJjZT2o7Cir7tmGYR3Z2U

Author: claude

Tests/NetNewsWireTests/ArticleExtractorTests.swift

@@ -0,0 +1,46 @@
+//
+//  ArticleExtractorTests.swift
+//  NetNewsWire
+//
+
+import XCTest
+@testable import NetNewsWire
+
+final class ArticleExtractorTests: XCTestCase {
+
+	func testNaverBlogURLConvertsToMobile() {
+		let rssLink = "https://blog.naver.com/alexlungu/224194816965?fromRss=true&trackingCode=rss"
+		let result = ArticleExtractor.extractionURL(for: rssLink)
+		XCTAssertEqual(result, "https://m.blog.naver.com/alexlungu/224194816965")
+	}
+
+	func testNaverBlogURLStripsAllQueryParams() {
+		let link = "https://blog.naver.com/someblog/123456789?foo=bar&baz=qux"
+		let result = ArticleExtractor.extractionURL(for: link)
+		XCTAssertEqual(result, "https://m.blog.naver.com/someblog/123456789")
+	}
+
+	func testNaverBlogURLWithNoQueryParams() {
+		let link = "https://blog.naver.com/someblog/123456789"
+		let result = ArticleExtractor.extractionURL(for: link)
+		XCTAssertEqual(result, "https://m.blog.naver.com/someblog/123456789")
+	}
+
+	func testMobileNaverBlogURLIsUnchanged() {
+		let link = "https://m.blog.naver.com/someblog/123456789"
+		let result = ArticleExtractor.extractionURL(for: link)
+		XCTAssertEqual(result, link)
+	}
+
+	func testNonNaverURLIsUnchanged() {
+		let link = "https://example.com/some/article?foo=bar"
+		let result = ArticleExtractor.extractionURL(for: link)
+		XCTAssertEqual(result, link)
+	}
+
+	func testInvalidURLIsUnchanged() {
+		let link = "not a url at all"
+		let result = ArticleExtractor.extractionURL(for: link)
+		XCTAssertEqual(result, link)
+	}
+}