docs: test-client: Mention snapshots for e2e tests
As discussed in
@@ -126,6 +126,9 @@ You should receive output that looks similar to the following:
Time: 0.752 s, estimated 21 s
Ran all test suites matching /isso\/js\/tests\/integration\//i.
+If you receive an error saying ``1 snapshot failed`` see
+:ref:`Updating snapshots <updating-snapshots>`
+
Troubleshooting timeouts
^^^^^^^^^^^^^^^^^^^^^^^^
@@ -259,7 +262,9 @@ which will saved into e.g. ``isso/js/tests/unit/__snapshots__/*.snap``
If you have created a commit which changes the HTML that is generated on the
client side (and you're sure it is correct) or written a new test case that
uses snapshots, check in or update the snapshot file by running
-``npm run test-unit -- -u``. You should see something like the following:
+``npm run test-unit -- -u`` (or ``npm run test-integration -- -u`` for
+integration tests with the dev server running). You should see something like
+the following:
.. code-block:: text
