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<!DOCTYPE html>
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Copyright (C) 2016 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-syntax-lib-loader</title>
<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<script src="../../../bower_components/web-component-tester/browser.js"></script>
<link rel="import" href="gr-syntax-lib-loader.html">
<script>void(0);</script>
<test-fixture id="basic">
<template>
<gr-syntax-lib-loader></gr-syntax-lib-loader>
</template>
</test-fixture>
<script>
suite('gr-syntax-lib-loader tests', function() {
var element;
var resolveLoad;
var loadStub;
setup(function() {
element = fixture('basic');
loadStub = sinon.stub(element, '_loadHLJS', function() {
return new Promise(function(resolve) {
resolveLoad = resolve;
});
});
// Assert preconditions:
assert.isFalse(element._state.loaded);
assert.isFalse(element._state.loading);
});
teardown(function() {
if (window.hljs) {
delete window.hljs;
}
loadStub.restore();
// Because the element state is a singleton, clean it up.
element._state.loading = false;
element._state.loaded = false;
element._state.callbacks = [];
});
test('only load once', function(done) {
var firstCallHandler = sinon.stub();
element.get().then(firstCallHandler);
// It should now be in the loading state.
assert.isTrue(loadStub.called);
assert.isTrue(element._state.loading);
assert.isFalse(element._state.loaded);
assert.isFalse(firstCallHandler.called);
var secondCallHandler = sinon.stub();
element.get().then(secondCallHandler);
// No change in state.
assert.isTrue(element._state.loading);
assert.isFalse(element._state.loaded);
assert.isFalse(firstCallHandler.called);
assert.isFalse(secondCallHandler.called);
// Now load the library.
resolveLoad();
flush(function() {
// The state should be loaded and both handlers called.
assert.isFalse(element._state.loading);
assert.isTrue(element._state.loaded);
assert.isTrue(firstCallHandler.called);
assert.isTrue(secondCallHandler.called);
done();
});
});
});
</script>