6 files changed, 80 insertions, 0 deletions
diff --git a/tests/specs/run/onload/__test__.jsonc b/tests/specs/run/onload/__test__.jsonc
new file mode 100644
index 000000000..b17dc665d
--- /dev/null
+++ b/tests/specs/run/onload/__test__.jsonc
@@ -0,0 +1,4 @@
+{
+  "args": "run --quiet --reload --config deno.json onload/main.ts",
+  "output": "onload/main.out"
+}
diff --git a/tests/specs/run/onload/deno.json b/tests/specs/run/onload/deno.json
new file mode 100644
index 000000000..105514e13
--- /dev/null
+++ b/tests/specs/run/onload/deno.json
@@ -0,0 +1,4 @@
+{
+  "lock": false,
+  "importMap": "../../../../import_map.json"
+}
diff --git a/tests/specs/run/onload/onload/imported.ts b/tests/specs/run/onload/onload/imported.ts
new file mode 100644
index 000000000..643e2fc78
--- /dev/null
+++ b/tests/specs/run/onload/onload/imported.ts
@@ -0,0 +1,12 @@
+import { assert } from "@std/assert";
+import "./nest_imported.ts";
+
+const handler = (e: Event) => {
+  assert(e.type === "beforeunload" ? e.cancelable : !e.cancelable);
+  console.log(`got ${e.type} event in event handler (imported)`);
+};
+
+globalThis.addEventListener("load", handler);
+globalThis.addEventListener("beforeunload", handler);
+globalThis.addEventListener("unload", handler);
+console.log("log from imported script");
diff --git a/tests/specs/run/onload/onload/main.out b/tests/specs/run/onload/onload/main.out
new file mode 100644
index 000000000..b25d33fa8
--- /dev/null
+++ b/tests/specs/run/onload/onload/main.out
@@ -0,0 +1,15 @@
+log from nest_imported script
+log from imported script
+log from main
+got load event in event handler (nest_imported)
+got load event in event handler (imported)
+got load event in event handler (main)
+got load event in onload function
+got beforeunload event in event handler (nest_imported)
+got beforeunload event in event handler (imported)
+got beforeunload event in event handler (main)
+got beforeunload event in onbeforeunload function
+got unload event in event handler (nest_imported)
+got unload event in event handler (imported)
+got unload event in event handler (main)
+got unload event in onunload function
diff --git a/tests/specs/run/onload/onload/main.ts b/tests/specs/run/onload/onload/main.ts
new file mode 100644
index 000000000..c4b8424fb
--- /dev/null
+++ b/tests/specs/run/onload/onload/main.ts
@@ -0,0 +1,34 @@
+// deno-lint-ignore-file no-prototype-builtins
+import { assert } from "@std/assert";
+import "./imported.ts";
+
+assert(globalThis.hasOwnProperty("onload"));
+assert(globalThis.onload === null);
+
+const eventHandler = (e: Event) => {
+  assert(e.type === "beforeunload" ? e.cancelable : !e.cancelable);
+  console.log(`got ${e.type} event in event handler (main)`);
+};
+
+globalThis.addEventListener("load", eventHandler);
+
+globalThis.addEventListener("beforeunload", eventHandler);
+
+globalThis.addEventListener("unload", eventHandler);
+
+globalThis.onload = (e: Event) => {
+  assert(!e.cancelable);
+  console.log(`got ${e.type} event in onload function`);
+};
+
+globalThis.onbeforeunload = (e: BeforeUnloadEvent) => {
+  assert(e.cancelable);
+  console.log(`got ${e.type} event in onbeforeunload function`);
+};
+
+globalThis.onunload = (e: Event) => {
+  assert(!e.cancelable);
+  console.log(`got ${e.type} event in onunload function`);
+};
+
+console.log("log from main");
diff --git a/tests/specs/run/onload/onload/nest_imported.ts b/tests/specs/run/onload/onload/nest_imported.ts
new file mode 100644
index 000000000..f1d28e8dc
--- /dev/null
+++ b/tests/specs/run/onload/onload/nest_imported.ts
@@ -0,0 +1,11 @@
+import { assert } from "@std/assert";
+
+const handler = (e: Event) => {
+  assert(e.type === "beforeunload" ? e.cancelable : !e.cancelable);
+  console.log(`got ${e.type} event in event handler (nest_imported)`);
+};
+
+globalThis.addEventListener("load", handler);
+globalThis.addEventListener("beforeunload", handler);
+globalThis.addEventListener("unload", handler);
+console.log("log from nest_imported script");