Add page on testing, update manual install.

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+---
+layout: page
+title: Testing
+---
+
+# Testing
+
+<p class="lead">
+  This page describes how to run FixMyStreet’s test suite.
+</p>
+
+## Server testing
+
+You can run the test suite for the backend codebase by running the following
+command in the `fixmystreet` directory:
+
+{% highlight bash %}
+$ script/test
+{% endhighlight %}
+
+The `master` branch of the repository should always be passing all tests for
+our developers and on mySociety's servers.
+
+## Client testing
+
+To run the front-end tests, you will need to install
+[Cypress](https://cypress.io) using `npm` (not direct download), and the
+`cypress` command needs to be on your `PATH`. Then you can run the front-end
+tests headlessly using:
+
+{% highlight bash %}
+$ bin/browser-tests run
+{% endhighlight %}
+
+This uses its own test server and database, not affecting your development
+database. If you wish to run the tests interactively for debugging, use:
+
+{% highlight bash %}
+$ bin/browser-tests open
+{% endhighlight %}
+
+If you're running FixMyStreet in a Vagrant box, you can use this script to run
+the test server in the VM and Cypress outside of it:
+
+{% highlight bash %}
+$ bin/browser-tests --vagrant run
+{% endhighlight %}