To avoid repeated regressions, we should include an end-to-end test for inserting a reusable block by Inserter in a fresh editor page. See #9962 (comment) .

Original Regression:

Describe the bug

Reusable blocks are not shown in the Inserter.

To Reproduce

1. (Prerequisite) Create a reusable block in a Gutenberg editor session
2. Create a new post
3. Try to insert the reusable block (either one preexisting, or the one created in Step 1) using the Inserter.
4. Observe that the reusable block is not shown in the inserter.

Expected behavior

Reusable block is both shown and searchable.

Additional context

Slack mentions:

• https://wordpress.slack.com/archives/C02QB2JS7/p1537090223000100
• https://wordpress.slack.com/archives/C02QB2JS7/p1537090223000100

From @youknowriad:

I think we do have an e2e test, what's missing is an e2e test inserting a reusable block after refreshing the page.