test_double_submit.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test for multiple submissions in straightline code</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<script>

add_task(async function double_submit() {

  dump("test start\n");

  let popup = window.open("file_double_submit.html");

  await new Promise(resolve => {

    popup.addEventListener("load", resolve, {once: true})

});

  let numCalls = 0;

  popup.addEventListener("beforeunload", () => {

    numCalls++;

    info("beforeunload called " + numCalls + " times");

});

  info("clicking button");

  popup.document.querySelector("button").click();

  is(numCalls, 1, "beforeunload should only fire once");

  popup.close();

});

</script>

</body>

</html>