fix warning in native mode about parser not found

commafeed-server/src/test/java/com/commafeed/backend/service/FeedEntryContentCleaningServiceTest.java

@@ -0,0 +1,31 @@
+package com.commafeed.backend.service;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class FeedEntryContentCleaningServiceTest {
+
+	private final FeedEntryContentCleaningService feedEntryContentCleaningService = new FeedEntryContentCleaningService();
+
+	@Test
+	void testClean() {
+		String content = """
+				<p>
+				Some text
+				<img width="965" height="320" src="https://localhost/an-image.png" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="alt-desc" decoding="async" sizes="(max-width: 965px) 100vw, 965px" style="width: 100%; opacity: 0">
+				<iframe src="url" style="width: 100%; opacity: 0"></iframe>
+				<forbidden-element>aaa</forbidden-element>
+				""";
+		String result = feedEntryContentCleaningService.clean(content, "baseUri", false);
+
+		Assertions.assertLinesMatch("""
+				<p>
+				Some text
+				<img width="965" height="320" src="https://localhost/an-image.png" alt="alt-desc" style="width:100%;">
+				<iframe src="url" style="width:100%;"></iframe>
+				aaa
+				</p>
+				""".lines(), result.lines());
+	}
+
+}