yak(behavior-tests-web-controllers-and-auth-edge-cases-o04i): behavior tests: web controllers and auth edge cases

app/test/firehose_web/controllers/blog_test.exs

@@ -20,6 +20,29 @@ defmodule FirehoseWeb.BlogTest do
       body = visit_blog_page(conn, "engineering", "/hello-world")
       assert body =~ "Hello World"
     end
+
+    test "GET /blog/engineering?page=2 shows the next page of older posts", %{conn: conn} do
+      # Page size is 10 (`Blogex.Blog.paginate/2`, blogex/lib/blogex/blog.ex:121)
+      # and the test env lists drafts (`show_drafts: true`,
+      # app/config/config.exs), so the 34 visible engineering posts (the
+      # 2099-dated future post is excluded by `all_posts/0`) fill 4 pages.
+      # Page 2, date-descending, runs 2026-07-20 .. 2026-05-14.
+      body = visit_blog_page(conn, "engineering", "?page=2")
+
+      # The pager reports the page the reader asked for, not page 1
+      # (markup: blogex/lib/blogex/components.ex).
+      assert body =~ ~r/Page 2 of \d+/
+
+      # "Synthetic TDD" (2026-07-13) sits mid-page-2: five posts of headroom
+      # before new publications would push it to page 3. Matched as an anchor
+      # because the description of the page-2 post above it also says
+      # "Synthetic TDD".
+      assert body =~ ~s|>Synthetic TDD</a>|
+
+      # The newest post is unambiguously on page 1, so page 2 is a genuinely
+      # different set of posts rather than page 1 relabelled.
+      refute body =~ "I reduced the attack surface"
+    end
   end
 
   describe "release notes blog (HTML)" do