feat(web): add beforeunload event (#14830)

This commit adds the 'beforeunload' event.

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/cli/tools/test.rs b/cli/tools/test.rs
index ac146fdbf..71374d94e 100644
--- a/cli/tools/test.rs
+++ b/cli/tools/test.rs
@@ -814,6 +814,13 @@ async fn test_specifier(
 
   worker.js_runtime.resolve_value(test_result).await?;
 
+  loop {
+    if !worker.dispatch_beforeunload_event(&located_script_name!())? {
+      break;
+    }
+    worker.run_event_loop(false).await?;
+  }
+
   worker.dispatch_unload_event(&located_script_name!())?;
 
   if let Some(coverage_collector) = maybe_coverage_collector.as_mut() {