Issue 7236 - Handle sub properties in abort-on-property snippets

test/browser/snippets.js

Index: test/browser/snippets.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/test/browser/snippets.js
@@ -0,0 +1,128 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+const library = require("../../lib/content/snippets.js");
+
+// We need this stub for the injector.
+window.browser =

[Manish Jethani, 2019/03/12 07:00:09]

Nit: The normal style for object literals we use is to place the opening brace
on the same line.

[hub, 2019/03/12 14:29:17]

Done.

[Manish Jethani, 2019/03/12 14:48:49]

The same would apply to the nested `runtime` property.

[hub, 2019/03/12 15:15:11]

I wonder why the linter is silent.

Done

+{
+  runtime:
+  {
+    getURL: () => ""
+  }
+};
+
+let testDocument = null;
+
+exports.setUp = function(callback)
+{
+  let iframe = document.createElement("iframe");
+  document.body.appendChild(iframe);
+  testDocument = iframe.contentDocument;

[Manish Jethani, 2019/03/12 07:00:09]

Where is `testDocument` being used in this file?

We should create the same conditions in which the snippet will run in the
extension. Ideally this would be a top-level frame that is created and destroyed
for each test, but an inner frame would be OK too (for most snippets).

[hub, 2019/03/12 14:29:18]

Used Line 44. Declared line 31.

This is the exact same thing as in `test/browser/elementHidingEmulation.js`

We create a document in an iframe on setUp and remove it on tearDown

[Manish Jethani, 2019/03/12 14:48:49]

Yes, but over there we have this line:

    elemHideEmulation.document = testDocument;

The document used by the element hiding emulation code is the test document.
Over here, are we using the test document at all? I don't see it.

[hub, 2019/03/12 15:15:11]

On second thought, we don't need this iframe either.

+
+  callback();
+};
+
+exports.tearDown = function(callback)
+{
+  let iframe = testDocument.defaultView.frameElement;
+  iframe.parentNode.removeChild(iframe);
+  testDocument = null;
+
+  callback();
+};
+
+function timeout(delay)
+{
+  return new Promise((resolve, reject) =>

[Manish Jethani, 2019/03/12 07:00:09]

We don't need `reject` here, and we could also lose the parentheses.

[hub, 2019/03/12 14:29:17]

tbh this is a cut&paste from `test/browser/elementHidingEmulation.js` and it has
the same.

The original source.
https://codereview.adblockplus.org/29494577/diff/29523754/test/browser/elemHi...

Will fix here.

[Manish Jethani, 2019/03/12 14:48:49]

Acknowledged.

+  {
+    window.setTimeout(resolve, delay);

[Manish Jethani, 2019/03/12 07:00:09]

`setTimeout()` is a global function also available on contexts that do not have
a `window` object (e.g. Node.js). We should just call it directly.

PS:  What about placing this function in a common place so it can be shared with
`browser/tests/elemHideEmulation.js`?

[hub, 2019/03/12 14:29:17]

This is always run in the browser context. But see above.
Done

[Manish Jethani, 2019/03/12 14:48:49]

Acknowledged.

+  });
+}
+
+async function runSnippet(test, snippetName, ...args)

[Manish Jethani, 2019/03/12 07:00:09]

We could rename this to `runScript(test, script)` and use the `parseScript()`
function from `lib/snippets.js` to get the commands and arguments; then we
simply iterate over the commands and execute each one with its arguments.

[hub, 2019/03/12 14:29:18]

The goal was to individually test the snippet, simply. Not to verify the
injection and parsing.

+{
+  let snippet = library[snippetName];
+
+  test.ok(snippet);
+
+  snippet(...args);
+  await timeout(100);
+}
+
+exports.testAbortPropertyReadSnippet = async function(test)
+{
+  window.abpTest = "foo";
+
+  async function testProperty(property, result = true)
+  {
+    let properties = property.split(".");
+    test.ok(properties.length >= 1);
+
+    let exceptionCaught = false;
+    let value = 1;
+    try
+    {
+      let obj = window;
+      while (properties.length > 1)
+        obj = obj[properties.shift()];
+      value = obj[properties.shift()];
+    }
+    catch (e)
+    {
+      if (properties.length == 0)
+        exceptionCaught = true;
+    }
+    test.equal(exceptionCaught, result, `The property "${property}" didn't trigger and exception.`);
+    test.equal(value, result ? 1 : undefined, `The value for "${property}" shouldn't have been read.`);
+  }
+
+  await runSnippet(test, "abort-on-property-read", "abpTest");
+  await testProperty("abpTest");
+
+  window.abpTest2 = {prop1: "foo"};
+
+  await runSnippet(test, "abort-on-property-read", "abpTest2.prop1");
+  await testProperty("abpTest2.prop1");
+
+  // Test that we try to catch a property that don't exist yet.
+  await runSnippet(test, "abort-on-property-read", "abpTest3.prop1");
+  window.abpTest3 = {prop1: "foo"};
+  await testProperty("abpTest3.prop1");
+
+  // Test that other properties don't trigger.
+  await testProperty("abpTest3.prop2", false);
+
+  // Test overwriting the object with another object
+  window.foo = {bar: {}};
+  await runSnippet(test, "abort-on-property-read", "foo.bar.lambda");
+  await testProperty("foo.bar.lambda");
+  window.foo.bar = {};
+  await testProperty("foo.bar.lambda");
+
+  // Test if we start with a non-object
+  window.foo2 = 5;
+  await runSnippet(test, "abort-on-property-read", "foo2.bar2.lambda");
+  await testProperty("foo2.bar2.lambda");
+  window.foo2 = {};
+  await testProperty("foo2.bar2.lambda");
+
+  test.done();
+};
+