test: harden checked boundary coverage

Use DOM-aware rendered-text inspection for the v0 shell marker check and extend unkeyed h-for validation coverage from slots to handles.

req: test/005

req: scope/001

examples/v0/src/main.rs

@@ -248,7 +248,10 @@ mod tests {
         );
         assert_eq!(document.select(&selector("script[src=\"/slhx.js\"]")).count(), 1);
         assert_eq!(document.select(&selector("main[data-slhx-root=\"docs\"]")).count(), 1);
-        assert!(!html.contains("{+="));
+        assert!(
+            document.root_element().text().all(|text| !text.contains("{+=")),
+            "hemplate insertion markers must not leak into rendered text"
+        );
     }
 
     // req: html_safety/002 req: view/001 req: test/005

slhx-build/src/lib.rs

@@ -1127,22 +1127,32 @@ fn main() {{
 
     #[test]
     fn rejects_slhx_resources_inside_unkeyed_for() {
-        let base = test_dir("slhx-build-unkeyed-for-test");
-        let templates = base.join("templates");
-        let out = base.join("out");
-        let _ = std::fs::remove_dir_all(&base);
-        std::fs::create_dir_all(&templates).unwrap();
-        std::fs::write(
-            templates.join("todo.heml"),
-            r#"<template h-for="todo in &self.todos"><li data-slhx-slot="todo_row">{+ todo.title +}</li></template>"#,
-        )
-        .unwrap();
+        // req: scope/001
+        for (case, template, resource) in [
+            (
+                "slot",
+                r#"<template h-for="todo in &self.todos"><li data-slhx-slot="todo_row">{+ todo.title +}</li></template>"#,
+                "data-slhx-slot=\"todo_row\"",
+            ),
+            (
+                "handle",
+                r#"<template h-for="todo in &self.todos"><button data-slhx-handle="delete">Delete</button></template>"#,
+                "data-slhx-handle=\"delete\"",
+            ),
+        ] {
+            let base = test_dir(&format!("slhx-build-unkeyed-for-{case}-test"));
+            let templates = base.join("templates");
+            let out = base.join("out");
+            let _ = std::fs::remove_dir_all(&base);
+            std::fs::create_dir_all(&templates).unwrap();
+            std::fs::write(templates.join("todo.heml"), template).unwrap();
 
-        let err = app().template_dir(&templates).out_dir(&out).run().unwrap_err();
-        assert!(err.to_string().contains("inside an h-for without h-key"));
-        assert!(err.to_string().contains("data-slhx-slot=\"todo_row\""));
+            let err = app().template_dir(&templates).out_dir(&out).run().unwrap_err();
+            assert!(err.to_string().contains("inside an h-for without h-key"));
+            assert!(err.to_string().contains(resource));
 
-        let _ = std::fs::remove_dir_all(&base);
+            let _ = std::fs::remove_dir_all(&base);
+        }
     }
 
     #[test]