Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Mn Python tests
+
+_Marionette_ is the codename of a [remote protocol] built in to
+Firefox as well as the name of a functional test framework for
+automating user interface tests.
+
+The in-tree test framework supports tests written in Python, using
+Python’s [unittest] library.  Test cases are written as a subclass
+of `MarionetteTestCase`, with child tests belonging to instance
+methods that have a name starting with `test_`.
+
+You can additionally define [`setUp`] and [`tearDown`] instance
+methods to execute code before and after child tests, and
+[`setUpClass`]/[`tearDownClass`] for the parent test.  When you use
+these, it is important to remember calling the `MarionetteTestCase`
+superclass’ own [`setUp`]/[`tearDown`] methods since they handle
+setup/cleanup of the session.
+
+The test structure is illustrated here:
+
+```python
+from marionette_harness import MarionetteTestCase
+
+class TestSomething(MarionetteTestCase):
+    def setUp(self):
+        # code to execute before any tests are run
+        MarionetteTestCase.setUp(self)
+
+    def test_foo(self):
+        # run test for 'foo'
+
+    def test_bar(self):
+        # run test for 'bar'
+
+    def tearDown(self):
+        # code to execute after all tests are run
+        MarionetteTestCase.tearDown(self)
+```
+
+[remote protocol]: Protocol.md
+[unittest]: https://docs.python.org/3/library/unittest.html
+[`setUp`]: https://docs.python.org/3/library/unittest.html#unittest.TestCase.setUp
+[`setUpClass`]: https://docs.python.org/3/library/unittest.html#unittest.TestCase.setUpClass
+[`tearDown`]: https://docs.python.org/3/library/unittest.html#unittest.TestCase.tearDown
+[`tearDownClass`]: https://docs.python.org/3/library/unittest.html#unittest.TestCase.tearDownClass
+
+## Test assertions
+
+Assertions are provided courtesy of [unittest].  For example:
+
+```python
+from marionette_harness import MarionetteTestCase
+
+class TestSomething(MarionetteTestCase):
+    def test_foo(self):
+        self.assertEqual(9, 3 * 3, '3 x 3 should be 9')
+        self.assertTrue(type(2) == int, '2 should be an integer')
+```
+
+## The API
+
+The full API documentation is found [here], but the key objects are:
+
+* `MarionetteTestCase`: a subclass for `unittest.TestCase`
+  used as a base class for all tests to run.
+
+* {class}`Marionette <marionette_driver.marionette.Marionette>`: client that speaks to Firefox
+
+[here]: /python/marionette_driver.rst