HTML artifacts: render agent-sent HTML/CSS/JS code blocks in an in-app WebView (Android platform WebView, desktop JCEF/KCEF) via a full-screen preview; artifact card with Preview button + code toggle, shown only once the message stops streaming; webview-multiplatform 1.9.40 + KCEF deps, detection + unit tests

app/shared/src/commonTest/kotlin/iris/ui/HtmlArtifactTest.kt

@@ -0,0 +1,65 @@
+package iris.ui
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertNull
+import kotlin.test.assertTrue
+
+class HtmlArtifactTest {
+
+    @Test
+    fun htmlLanguageTagIsArtifact() {
+        assertTrue(isHtmlArtifact("html", "<p>hi</p>"))
+        assertTrue(isHtmlArtifact("htm", "<p>hi</p>"))
+        assertTrue(isHtmlArtifact("HTML", "<p>hi</p>"))
+        assertTrue(isHtmlArtifact(" html ", "<p>hi</p>"))
+    }
+
+    @Test
+    fun otherLanguageTagsAreNotArtifacts() {
+        assertFalse(isHtmlArtifact("css", "<style>x</style>"))
+        assertFalse(isHtmlArtifact("js", "console.log(1)"))
+        assertFalse(isHtmlArtifact("kotlin", "fun main() {}"))
+        // Even a full document inside a non-html fence is not an artifact.
+        assertFalse(isHtmlArtifact("text", "<!DOCTYPE html><html></html>"))
+    }
+
+    @Test
+    fun untaggedCompleteDocumentIsArtifact() {
+        assertTrue(isHtmlArtifact(null, "<!DOCTYPE html>\n<html><body>hi</body></html>"))
+        assertTrue(isHtmlArtifact(null, "  <html><body>hi</body></html>"))
+        assertTrue(isHtmlArtifact(null, "<HTML><BODY>hi</BODY></HTML>"))
+    }
+
+    @Test
+    fun untaggedFragmentIsNotArtifact() {
+        assertFalse(isHtmlArtifact(null, "<div>just a fragment</div>"))
+        assertFalse(isHtmlArtifact(null, "Some prose with <b>bold</b> inside."))
+        assertFalse(isHtmlArtifact(null, ""))
+    }
+
+    @Test
+    fun extractsTitle() {
+        assertEquals(
+            "My Page",
+            htmlTitle("<html><head><title>My Page</title></head><body></body></html>"),
+        )
+        assertEquals(
+            "Spaced",
+            htmlTitle("<title>  Spaced  </title>"),
+        )
+        // Case-insensitive, attributes allowed.
+        assertEquals(
+            "X",
+            htmlTitle("<TITLE lang=\"en\">X</TITLE>"),
+        )
+    }
+
+    @Test
+    fun missingOrEmptyTitleIsNull() {
+        assertNull(htmlTitle("<html><body>no title</body></html>"))
+        assertNull(htmlTitle("<title></title>"))
+        assertNull(htmlTitle("<title>   </title>"))
+    }
+}