Check if exposure is limited in test 404 page (#2351)

Author: queengooborg

app.ts

@@ -482,6 +482,11 @@ app.all(/\/tests\/(.*)/, (req: Request, res: Response) => {
       ident,
       suggestion: tests.didYouMean(ident),
       query: querystring.encode(req.query as any),
+      queryNoExposure: querystring.encode({
+        ...req.query,
+        exposure: undefined,
+      } as any),
+      exposure: req.query.exposure,
     });
   }
 });

views/testnotfound.ejs

@@ -9,7 +9,9 @@ See the LICENSE file for copyright details
 <%- contentFor('body') %>
 <h1>Test Not Found</h1>
 <p>Could not find a test for <code><%= ident %></code>. 
-  <% if (suggestion) { %>
+  <% if (exposure) { %>
+    <span class="notice">Tests are limited to the <code><%= exposure %></code> exposure; why not try with <a href="/tests/<%= `${ident}${query ? `?${queryNoExposure}`: ''}` %>">any exposure</a>?</span>
+  <% } else if (suggestion) { %>
     <span class="notice">Did you mean <a href="/tests/<%= `${suggestion.replace(/\./g, '/')}${query ? `?${query}`: ''}` %>"><code><%= suggestion %></code></a>?</span>
   <% } %>
 </p>