response-json-during-loading.html

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This WPT test may be referenced by the following Test IDs:
- /xhr/response-json-during-loading.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>XMLHttpRequest: response is null during LOADING for responseType json</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

"use strict";

async_test(t => {

  const xhr = new XMLHttpRequest();

  xhr.open("GET", "resources/json-with-bom.py");

  xhr.responseType = "json";

  let sawLoading = false;

  xhr.onreadystatechange = t.step_func(() => {

    if (xhr.readyState === XMLHttpRequest.LOADING) {

      sawLoading = true;

      assert_equals(xhr.response, null, "response must be null during LOADING for json responseType");

    if (xhr.readyState === XMLHttpRequest.DONE) {

      assert_true(sawLoading, "Should have seen LOADING state");

      assert_not_equals(xhr.response, null, "response must not be null during DONE");

      assert_equals(xhr.response.key, "value", "response must contain parsed JSON");

      t.done();

});

  xhr.onerror = t.unreached_func("XHR should not error");

  xhr.send();

}, "xhr.response must be null during LOADING state for responseType json");

</script>