tests: add autocomplete system tests.

Gemfile.lock

@@ -121,6 +121,16 @@ GEM
       sshkit (~> 1.3)
     capistrano3-unicorn (0.2.1)
       capistrano (~> 3.1, >= 3.1.0)
+    capybara (3.29.0)
+      addressable
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.8)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      regexp_parser (~> 1.5)
+      xpath (~> 3.2)
+    childprocess (2.0.0)
+      rake (< 13.0)
     chronic (0.10.2)
     cityhash (0.9.0)
     coderay (1.1.2)
@@ -289,6 +299,8 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.1)
+    puma (4.1.1)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-contrib (2.1.0)
       rack (~> 2.0)
@@ -335,6 +347,7 @@ GEM
     recaptcha (5.1.0)
       json
     redis (4.1.2)
+    regexp_parser (1.6.0)
     representable (2.3.0)
       uber (~> 0.0.7)
     request_store (1.4.1)
@@ -352,6 +365,9 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.8.0)
       nokogumbo (~> 2.0)
+    selenium-webdriver (3.142.4)
+      childprocess (>= 0.5, < 3.0)
+      rubyzip (~> 1.2, >= 1.2.2)
     shoulda-context (1.2.2)
     shoulda-matchers (4.1.2)
       activesupport (>= 4.2.0)
@@ -435,6 +451,8 @@ GEM
     websocket-extensions (0.1.4)
     whenever (1.0.0)
       chronic (>= 0.6.3)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
     zeitwerk (2.1.10)
 
 PLATFORMS
@@ -455,6 +473,7 @@ DEPENDENCIES
   capistrano-rails
   capistrano-rbenv
   capistrano3-unicorn
+  capybara
   cityhash
   daemons
   delayed_job
@@ -483,6 +502,7 @@ DEPENDENCIES
   pry-byebug
   pry-inline
   pry-rails
+  puma
   rack-mini-profiler
   rails (~> 6.0)
   rake
@@ -496,6 +516,7 @@ DEPENDENCIES
   ruby-vips
   rubyzip
   sanitize
+  selenium-webdriver
   shoulda-context
   shoulda-matchers
   simple_form