test_stringBindings.html

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https://bugzilla.mozilla.org/show_bug.cgi?id=1334537

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  <title>Test for Bug 1334537</title>

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

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

  <script type="application/javascript">

  /** Test for Bug 1334537 **/

  SimpleTest.waitForExplicitFinish();

  function go() {

    // Need a new global that will pick up our pref.

    var ifr = document.createElement("iframe");

    document.body.appendChild(ifr);

    var t = new ifr.contentWindow.TestFunctions();

    var testString = "abcdefghijklmnopqrstuvwxyz";

    const substringLength = 10;

    var shortTestString = testString.substring(0, substringLength);

    t.setStringData(testString);

    // Note: we want to do all our gets before we start running code we don't

    // control inside the test harness, if we really want to exercise the string

    // cache in controlled ways.

    var asShortDOMString = t.getStringDataAsDOMString(substringLength);

    var asFullDOMString = t.getStringDataAsDOMString();

    var asShortAString = t.getStringDataAsAString(substringLength);

    var asAString = t.getStringDataAsAString();

    is(asShortDOMString, shortTestString, "Short DOMString should be short");

    is(asFullDOMString, testString, "Full DOMString should be test string");

    is(asShortAString, shortTestString, "Short AString should be short");

    is(asAString, testString, "Full AString should be test string");

    // These strings should match the strings used in TestFunctions.cpp, but we

    // want to launder them through something on the JS side that will convert

    // them into strings stored in the JS heap.

    function launder(str) {

      // This should be sufficient, but if the JIT gets too smart we may need

      // to get more clever.

      return str.split("").join("");

    var shortString = launder(t.getShortLiteralString());

    var mediumString = launder(t.getMediumLiteralString());

    var longString = launder(t.getLongLiteralString());

    // A short or medium non-external string will become an inline FakeString.

    is(t.getStringType(shortString), "inline",

       "Short string should become inline");

    is(t.getStringType(mediumString), "inline",

       "Medium string should become inline");

    // A long string will become a stringbuffer FakeString on the way in.

    is(t.getStringType(longString), "stringbuffer",

       "Long string should become a stringbuffer");

    // A short literal string will become an inline JS string on the way out

    // and then become an inline FakeString on the way in.

    is(t.getStringType(t.getShortLiteralString()), "inline",

       "Short literal string should become inline");

    // A medium or long literal string will become an external JS string on the

    // way out and then become a literal FakeString on the way in.

    is(t.getStringType(t.getMediumLiteralString()), "literal",

       "Medium literal string should become literal");

    is(t.getStringType(t.getLongLiteralString()), "literal",

       "Long literal string should become literal");

    // A short stringbuffer string will become an inline JS string on the way

    // out and then become an inline FakeString on the way in.

    is(t.getStringType(t.getStringbufferString(shortString)), "inline",

       "Short stringbuffer string should become inline");

    // A medium or long stringbuffer string will become an external JS string

    // on the way out and then become a stringbuffer FakeString on the way in.

    is(t.getStringType(t.getStringbufferString(mediumString)), "stringbuffer",

       "Medium stringbuffer string should become stringbuffer");

    is(t.getStringType(t.getStringbufferString(longString)), "stringbuffer",

       "Long stringbuffer string should become stringbuffer");

    // Now test that roundtripping works fine.  We need to make sure the string

    // we are storing is not equal to any of the ones we have used above, to

    // avoid the external string cache interfering.

    t.setStringData(longString + "unique");  // Should store with stringbuffer.

    ok(t.stringbufferMatchesStored(t.getStringDataAsAString()),

       "Stringbuffer should have roundtripped");

    SimpleTest.finish();

  addLoadEvent(function() {

    SpecialPowers.pushPrefEnv({set: [["dom.expose_test_interfaces", true]]},

                              go);

});

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<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1334537">Mozilla Bug 1334537</a>

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<div id="content" style="display: none">

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<pre id="test">

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