diff --git a/rails/app/assets/stylesheets/hub.scss b/rails/app/assets/stylesheets/hub.scss
index d465db9e8..53d4a3cac 100644
--- a/rails/app/assets/stylesheets/hub.scss
+++ b/rails/app/assets/stylesheets/hub.scss
@@ -4,6 +4,12 @@ h1 {
         color: #bbb;
         font-size: 65%;
     }
+
+    .gravatar {
+        border-radius: 5px;
+        margin-right: 0.2em;
+        margin-top: -6px;
+    }
 }
 
 .nav-link {
@@ -39,13 +45,19 @@ h1 {
                 font-size: 90%;
             }
 
+            svg.bi {
+                color: #aaa;
+            }
+
             .gravatar {
+                margin-top: -2px;
                 border-radius: 2px;
             }
         }
 
         .site-tags {
             margin-left: 0.4em;
+            margin-top: 2px;
             font-size: 90%;
         }
     }
diff --git a/rails/app/controllers/application_controller.rb b/rails/app/controllers/application_controller.rb
index 63b313835..1a5e198fd 100644
--- a/rails/app/controllers/application_controller.rb
+++ b/rails/app/controllers/application_controller.rb
@@ -18,8 +18,8 @@ def redirect_www_requests
   end
 
   def permit_devise_params
-    devise_parameter_sanitizer.permit(:sign_up, keys: [:name])
-    devise_parameter_sanitizer.permit(:account_update, keys: [:name, :use_gravatar])
+    devise_parameter_sanitizer.permit(:sign_up, keys: [:name, :username])
+    devise_parameter_sanitizer.permit(:account_update, keys: [:name, :username, :use_gravatar])
   end
 
   def require_admin_user!
diff --git a/rails/app/controllers/hub_controller.rb b/rails/app/controllers/hub_controller.rb
index 06737feba..c21338034 100644
--- a/rails/app/controllers/hub_controller.rb
+++ b/rails/app/controllers/hub_controller.rb
@@ -1,62 +1,28 @@
 class HubController < ApplicationController
-  before_action :prepare_sorting,
-    :prepare_searching,
-    :prepare_tags,
-    :prepare_sites_and_render
 
   def index
+    render_hub
   end
 
   def tag
+    @tag = params[:tag]
+    render_hub
   end
 
-  # (Unused currently)
-  def twplugins
-  end
-
-  # (Unused currently)
-  def twdocs
-  end
-
-  private
-
-  def prepare_sites_and_render
-    @sites = Site.searchable.order(@sort_by[:field])
-    @sites = @sites.tagged_with(@tag) if @tag.present?
-    @sites = @sites.search_for(@search) if @search.present?
-    @sites = @sites.paginate(page: params[:page])
-
-    render action: :index
-  end
-
-  def prepare_tags
-    @hub_tags = Settings.hub_tags
-    @tag_tabs = Site.tags_for_searchable_sites.limit(4).pluck(:name)
-
-    # (Unused currently since there are no hub_tags)
-    if @hub_tags.keys.include?(action_name)
-      tag_info = @hub_tags[action_name]
-      @tag = tag_info[:tag]
-      @title = tag_info[:title]
-      @tag_description = tag_info[:description]
-
-    elsif params[:tag]
-      @tag = params[:tag]
-      # Beware that @tag is html unsafe
-      @tag_tabs = @tag_tabs.prepend(@tag).uniq
-      @tag_description = "Searchable sites tagged with '#{@tag}'."
-
+  def user
+    if params[:username].present? && user = User.find_by_username(params[:username])
+      @user = user
+      render_hub
     else
-      @title = "Tiddlyhost Hub"
-      @tag_description = "If you mark your site as 'Searchable' it will be listed here."
+      # TODO: 404 page here maybe
+      redirect_to '/hub'
     end
   end
 
-  def prepare_searching
-    @search = params[:search]
-  end
+  private
 
-  def prepare_sorting
+  def render_hub
+    # Prepare sort options
     @sort_options = {
       'views' => {
         name: 'view count',
@@ -69,6 +35,31 @@ def prepare_sorting
     }
 
     @sort_by = @sort_options[params[:sort]] || @sort_options['views']
+
+    # Prepare search
+    @search = params[:search]
+
+    # Prepare tag tabs
+    @tag_tabs = Site.tags_for_searchable_sites.limit(4).pluck(:name)
+    @tag_tabs = @tag_tabs.prepend(@tag).uniq if @tag.present?
+
+    # Apply sorting
+    @sites = Site.searchable.order(@sort_by[:field])
+
+    # Apply tag filtering
+    @sites = @sites.tagged_with(@tag) if @tag.present?
+
+    # Apply user filtering
+    @sites = @sites.where(user_id: @user.id) if @user.present?
+
+    # Apply search filtering
+    @sites = @sites.search_for(@search) if @search.present?
+
+    # Paginate
+    @sites = @sites.paginate(page: params[:page])
+
+    # Render
+    render action: :index
   end
 
 end
diff --git a/rails/app/helpers/application_helper.rb b/rails/app/helpers/application_helper.rb
index efdd55f02..75179135b 100644
--- a/rails/app/helpers/application_helper.rb
+++ b/rails/app/helpers/application_helper.rb
@@ -23,7 +23,7 @@ def bi_icon(icon, opts={})
       class: ["bi"].append(opts.delete(:class)).compact,
       height: "1.2em",
       width: "1.4em",
-      style: "margin-top:-3px;margin-right:4px;#{opts.delete(:style)}")
+      style: "margin-top:-3px;margin-right:3px;#{opts.delete(:style)}")
 
     content_tag(:svg, opts) do
       content_tag(:use, nil, "xlink:href" =>
diff --git a/rails/app/helpers/sites_helper.rb b/rails/app/helpers/sites_helper.rb
index 4c86bc246..2d0ed6277 100644
--- a/rails/app/helpers/sites_helper.rb
+++ b/rails/app/helpers/sites_helper.rb
@@ -36,11 +36,7 @@ def site_tags(site)
   end
 
   def tag_url(tag_name)
-    if hub_action = Settings.hub_tags_lookup[tag_name]
-      "/hub/#{hub_action}"
-    else
-      "/hub/tag/#{tag_name}"
-    end
+    "/hub/tag/#{tag_name}"
   end
 
   def clickable_site_tags(site)
diff --git a/rails/app/javascript/packs/application.js b/rails/app/javascript/packs/application.js
index 50890a81c..ca84d8fb9 100644
--- a/rails/app/javascript/packs/application.js
+++ b/rails/app/javascript/packs/application.js
@@ -20,21 +20,35 @@ $(document).ready(function(){
     event.preventDefault();
   })
 
-  // Make it so the user can't easily type invalid names.
-  // We'll validate the name on the server as well, see app/models/site.
-  $('#site_name').on('keyup', function(){
-    $(this).val(
-      $(this).val().
-        // Remove anything that's not a letter, numeral or dash
-        replace(/[^0-9a-z-]/, '').
-        // Replace consecutive dashes with a single dash
-        replace(/[-]{2,}/, '-').
-        // Remove leading dashes
-        // (Don't remove trailing dashes since it makes it hard to type
-        // names with dashes. The server will invalidate them anyway.)
-        replace(/^-/, '')
+  var limitChars = function() {
+    var inputField = $(this);
+
+    if (inputField.attr('id') == 'site_name') {
+      // Allow lowercase letters, numerals and dashes
+      var notAllowed = /[^0-9a-z-]/;
+    }
+    else { // id == 'user_username"
+      // Same thing but also allow uppercase
+      var notAllowed = /[^0-9a-zA-Z-]/;
+    }
+
+    var currentVal = inputField.val();
+    inputField.val(currentVal.
+      // Remove any disallowed chars
+      replace(notAllowed, '').
+      // Replace consecutive dashes with a single dash
+      replace(/[-]{2,}/, '-').
+      // Remove leading dashes
+      // (Don't remove trailing dashes since it makes it hard to type
+      // names with dashes. The server will invalidate them anyway.)
+      replace(/^-/, '')
     );
-  });
+  };
+
+  // Make it so the user can't easily type invalid site names or usernames.
+  // We'll validate server-side as well, see User and Site model validations.
+  $('input#site_name').on('keyup', limitChars);
+  $('input#user_username').on('keyup', limitChars);
 
   // If site is set to private, automatically make it unsearchable
   // If site is set to searchable, automatically make it public
diff --git a/rails/app/models/user.rb b/rails/app/models/user.rb
index 2870befd1..bcc8524ae 100644
--- a/rails/app/models/user.rb
+++ b/rails/app/models/user.rb
@@ -19,6 +19,28 @@ class User < ApplicationRecord
   belongs_to :plan
   validates_presence_of :name
 
+  validates :username,
+    uniqueness: {
+      case_sensitive: false,
+    },
+    length: {
+      minimum: 3,
+      maximum: 30,
+      allow_blank: true,
+    },
+    format: {
+      # Must be upper- or lowercase letters, numerals, and dashes
+      # Must not have more than one consecutive dash
+      # Must not start or end with a dash
+      # (See also app/javascript/packs/application.js)
+      without: / [^A-Za-z0-9-] | -- | ^- | -$ /x,
+      message: "'%{value}' is not allowed. Please choose a different username.",
+    }
+
+  def username_or_name
+    username.presence || name
+  end
+
   def has_plan?(plan_name)
     plan.name == plan_name.to_s
   end
diff --git a/rails/app/views/devise/registrations/edit.html.haml b/rails/app/views/devise/registrations/edit.html.haml
index fc2fc7163..1eac900f6 100644
--- a/rails/app/views/devise/registrations/edit.html.haml
+++ b/rails/app/views/devise/registrations/edit.html.haml
@@ -5,19 +5,26 @@
   .form-group
     =render 'devise/shared/error_messages', resource: resource
 
-  .form-group
-    =f.label :name
-    =f.text_field :name, autofocus: true, autofill: 'off', autocomplete: 'off', class: 'form-control col-sm-6'
-
   .form-group
     =f.label :email
-    =f.email_field :email, autocomplete: 'email', class: 'form-control col-sm-6'
+    =f.email_field :email, autocomplete: true, autocomplete: 'email', class: 'form-control col-sm-6'
+    %small.form-text.text-muted Your email address
 
   -if devise_mapping.confirmable? && resource.pending_reconfirmation?
     %small.form-text.text-muted
       Currently waiting confirmation for:
       =resource.unconfirmed_email
 
+  .form-group
+    =f.label :name
+    =f.text_field :name, autofocus: true, autofill: 'off', autocomplete: 'off', class: 'form-control col-sm-6'
+    %small.form-text.text-muted Your name
+
+  .form-group
+    = f.label :username
+    = f.text_field :username, autofocus: true, autofill: 'off', autocomplete: 'off', class: 'form-control col-sm-6'
+    %small.form-text.text-muted Unique username (optional)
+
   .form-group
     =gravatar_image(resource)
     %div.form-group
diff --git a/rails/app/views/devise/registrations/new.html.haml b/rails/app/views/devise/registrations/new.html.haml
index 413b95f29..85b1d7b99 100644
--- a/rails/app/views/devise/registrations/new.html.haml
+++ b/rails/app/views/devise/registrations/new.html.haml
@@ -5,15 +5,20 @@
   .form-group
     =render 'devise/shared/error_messages', resource: resource
 
+  .form-group
+    = f.label :email
+    = f.email_field :email, autofocus: true, autocomplete: 'email', class: 'form-control col-sm-6'
+    %small.form-text.text-muted Enter your email address
+
   .form-group
     = f.label :name
-    = f.text_field :name, autofocus: true, autofill: 'off', autocomplete: 'off', class: 'form-control col-sm-6'
+    = f.text_field :name, autofill: 'off', autocomplete: 'off', class: 'form-control col-sm-6'
     %small.form-text.text-muted Please enter your name
 
   .form-group
-    = f.label :email
-    = f.email_field :email, autocomplete: 'email', class: 'form-control col-sm-6'
-    %small.form-text.text-muted Enter your email address
+    = f.label :username
+    = f.text_field :username, autofocus: true, autofill: 'off', autocomplete: 'off', class: 'form-control col-sm-6'
+    %small.form-text.text-muted Optional. Choose a unique username between 3 and 30 characters long.
 
   .form-group
     = f.label :password
diff --git a/rails/app/views/hub/index.html.haml b/rails/app/views/hub/index.html.haml
index 53955ca42..c6d2703db 100644
--- a/rails/app/views/hub/index.html.haml
+++ b/rails/app/views/hub/index.html.haml
@@ -1,14 +1,28 @@
 
-%h1= @title || bi_icon(:tag) + @tag
+%h1
+  - if @tag.present?
+    = bi_icon('tag') + @tag
+  - elsif @user.present?
+    - if @user.use_gravatar?
+      = gravatar_image(@user, size: 35) + @user.name
+    - else
+      = bi_icon('person-fill') + @user.name
+  - else
+    Tiddlyhost Hub
 
 %p.text-muted{style: 'font-size: 95%'}
-  = @tag_description
+  - if @tag.present?
+    Sites tagged with
+    %b= @tag + '.'
+  - elsif @user.present?
+    Sites created by Tiddlyhost user
+    %b= @user.username + '.'
+  - else
+    If you mark your site as 'Searchable' it will be listed here.
 
 %div{style: "margin-bottom: 2em;"}
   %ul.nav.nav-tabs
     = hub_link_to('All sites', '/hub')
-    - @hub_tags.each do |k, tag_info|
-      = hub_link_to(tag_info[:title], "/hub/#{k}")
     - @tag_tabs.each do |tag|
       = hub_tag_link_to(tag)
 
@@ -35,15 +49,21 @@
 
 .hub
   - @sites.each do |s|
-    .site
+    .site{id: s.name}
       .name
         = site_long_link s
       .description
         = span_with_title_truncated(s.description)
       .owner
-        %span Owner:
-        = gravatar_image(s.user, size: 16) if s.user.use_gravatar?
-        = s.user.name
+        - if s.user.use_gravatar?
+          = gravatar_image(s.user, size: 14) if s.user.use_gravatar?
+        - else
+          = bi_icon('person-fill', style: 'margin-right:-3px;')
+        - if s.user.username.present?
+          %span{title: s.user.name}
+          = link_to s.user.username, "/hub/user/#{s.user.username}"
+        - else
+          = s.user.name
         %span{style: 'margin-left: 0.5em;'} Views:
         = s.view_count
       - unless s.tag_list.empty?
diff --git a/rails/app/views/layouts/_header.html.erb b/rails/app/views/layouts/_header.html.erb
index 30e702cbe..784dff86c 100644
--- a/rails/app/views/layouts/_header.html.erb
+++ b/rails/app/views/layouts/_header.html.erb
@@ -22,7 +22,7 @@
           <%= nav_link_to "Sites", admin_sites_path %>
           <%= nav_link_to "Users", admin_users_path %>
         <% end %>
-        <%= nav_link_to current_user.name, edit_user_registration_path, icon: 'person-fill' %>
+        <%= nav_link_to current_user.username_or_name, edit_user_registration_path, icon: 'person-fill' %>
         <%= nav_link_to "Log out", destroy_user_session_path, method: :delete, icon: 'box-arrow-left' %>
       </ul>
     <% else %>
diff --git a/rails/config/initializers/app_version.rb b/rails/config/initializers/app_version.rb
index c4910e386..4201bdba7 100644
--- a/rails/config/initializers/app_version.rb
+++ b/rails/config/initializers/app_version.rb
@@ -1 +1 @@
-App::VERSION = '0.0.3'
+App::VERSION = '0.0.4'
diff --git a/rails/config/initializers/devise.rb b/rails/config/initializers/devise.rb
index 2fa6f57d8..ed2d384c3 100644
--- a/rails/config/initializers/devise.rb
+++ b/rails/config/initializers/devise.rb
@@ -63,7 +63,7 @@
   # Configure which authentication keys should have whitespace stripped.
   # These keys will have whitespace before and after removed upon creating or
   # modifying a user and when used to authenticate or find a user. Default is :email.
-  config.strip_whitespace_keys = [:email, :name]
+  config.strip_whitespace_keys = [:email, :name, :username]
 
   # Tell if authentication through request.params is enabled. True by default.
   # It can be set to an array that will enable params authentication only for the
diff --git a/rails/config/routes.rb b/rails/config/routes.rb
index 42d3ef31f..a26b4a38e 100644
--- a/rails/config/routes.rb
+++ b/rails/config/routes.rb
@@ -28,10 +28,8 @@
     get 'admin/sites'
 
     get 'hub', to: 'hub#index'
-    Settings.hub_tags.keys.each do |k|
-      get "hub/#{k}", controller: :hub
-    end
     get "hub/tag/:tag", controller: :hub, action: :tag
+    get "hub/user/:username", controller: :hub, action: :user
 
     resources :sites
   end
diff --git a/rails/config/settings.yml b/rails/config/settings.yml
index c183c396c..7c083a6a2 100644
--- a/rails/config/settings.yml
+++ b/rails/config/settings.yml
@@ -6,17 +6,6 @@ defaults:
   default_plan_name: basic
   minimum_password_length: 8
 
-  # Let's turn these off for now and see what tags appear organically
-  #hub_tags:
-  #  twplugins:
-  #    :title: TiddlyWiki Plugin Hub
-  #    :tag: TiddlyWikiPlugin
-  #    :description: Sites containing useful plugins created by the TiddlyWiki community.
-  #  twdocs:
-  #    :title: TiddlyWiki Docs Hub
-  #    :tag: TiddlyWikiDoc
-  #    :description: Sites container documentation, tutorials, and other informational resources related to TiddlyWiki.
-
   #banner_message:
   #  :icon: exclamation-triangle
   #  :html: |
diff --git a/rails/db/migrate/20210222220346_add_username_to_users.rb b/rails/db/migrate/20210222220346_add_username_to_users.rb
new file mode 100644
index 000000000..1f58f1792
--- /dev/null
+++ b/rails/db/migrate/20210222220346_add_username_to_users.rb
@@ -0,0 +1,5 @@
+class AddUsernameToUsers < ActiveRecord::Migration[6.1]
+  def change
+    add_column :users, :username, :string, limit: 30
+  end
+end
diff --git a/rails/db/schema.rb b/rails/db/schema.rb
index 5a49c6003..9c4a760c1 100644
--- a/rails/db/schema.rb
+++ b/rails/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_02_22_211144) do
+ActiveRecord::Schema.define(version: 2021_02_22_220346) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -111,6 +111,7 @@
     t.datetime "updated_at", precision: 6, null: false
     t.bigint "plan_id", default: 1
     t.boolean "use_gravatar", default: false
+    t.string "username", limit: 30
     t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["plan_id"], name: "index_users_on_plan_id"
diff --git a/rails/lib/settings.rb b/rails/lib/settings.rb
index 2c76be8f2..69f843e3f 100644
--- a/rails/lib/settings.rb
+++ b/rails/lib/settings.rb
@@ -38,12 +38,4 @@ def self.nil_blobs_ok?
     Rails.env.development?
   end
 
-  def self.hub_tags
-    SETTINGS['hub_tags'] || {}
-  end
-
-  def self.hub_tags_lookup
-    @@_hub_tags_lookup ||= Hash[Settings.hub_tags.map{ |k,t| [t[:tag], k] }]
-  end
-
 end
diff --git a/rails/test/controllers/hub_controller_test.rb b/rails/test/controllers/hub_controller_test.rb
index 0caaccd67..cef970abb 100644
--- a/rails/test/controllers/hub_controller_test.rb
+++ b/rails/test/controllers/hub_controller_test.rb
@@ -2,14 +2,58 @@
 
 class HubControllerTest < ActionDispatch::IntegrationTest
 
-  test "should get index" do
+  setup do
+    @user = users(:bobby)
+    @site = sites(:mysite)
+  end
+
+  test "hub index" do
+    get '/hub'
+    assert_response :success
+    assert_site_visible
+
+    # Make it not searchable
+    @site.update(is_searchable: false)
     get '/hub'
     assert_response :success
+    assert_site_not_visible
   end
 
-  test "tag urls" do
+  test "hub tag urls" do
     get '/hub/tag/bananas'
     assert_response :success
+    assert_site_not_visible
+
+    @site.tag_list.add('bananas')
+    @site.save!
+    get '/hub/tag/bananas'
+    assert_response :success
+    assert_site_visible
+  end
+
+  test "hub user urls" do
+    get '/hub/user/bobby'
+    assert_response :success
+    assert_site_visible
+
+    # Make it not searchable
+    @site.update(is_searchable: false)
+    get '/hub/user/bobby'
+    assert_response :success
+    assert_site_not_visible
+  end
+
+  test "a non existent user" do
+    get '/hub/user/doesntexist'
+    assert_redirected_to '/hub'
+  end
+
+  def assert_site_visible(site=@site)
+    assert_select(".hub .site##{site.name}", count: 1)
+  end
+
+  def assert_site_not_visible(site=@site)
+    assert_select(".hub .site##{site.name}", count: 0)
   end
 
 end
diff --git a/rails/test/fixtures/sites.yml b/rails/test/fixtures/sites.yml
index 18d5d765d..344608484 100644
--- a/rails/test/fixtures/sites.yml
+++ b/rails/test/fixtures/sites.yml
@@ -4,6 +4,8 @@ mysite:
   name: mysite
   user_id: 1
   view_count: 1
+  is_private: 0
+  is_searchable: 1
   accessed_at: <%= 1.hours.ago %>
   updated_at: <%= 2.hours.ago %>
   created_at: <%= 3.hours.ago %>
diff --git a/rails/test/fixtures/users.yml b/rails/test/fixtures/users.yml
index 366641291..82bd70ffd 100644
--- a/rails/test/fixtures/users.yml
+++ b/rails/test/fixtures/users.yml
@@ -3,6 +3,7 @@ bobby:
   id: 1
   plan_id: 1
   email: bobby@tables.com
+  username: bobby
   encrypted_password: "$2a$12$7Vo3LPYma6We0nrvr.8iiewwdiir2g1BncZreaif3juRKLUZWOPMi"
   reset_password_token:
   reset_password_sent_at:
diff --git a/rails/test/integration/user_signup_test.rb b/rails/test/integration/user_signup_test.rb
index b340ef2e1..003a65eb3 100644
--- a/rails/test/integration/user_signup_test.rb
+++ b/rails/test/integration/user_signup_test.rb
@@ -3,8 +3,8 @@
 class UserSignupTest < CapybaraIntegrationTest
 
   test "user signup" do
-    name, email, weak_password, strong_password =
-      'Testy McTest', 'tmctest@mail.com', 'trstno1', 'trUst|no1'
+    name, email, username, weak_password, strong_password =
+      'Testy McTest', 'tmctest@mail.com', 'tmt', 'trstno1', 'trUst|no1'
 
     # Visit home page and click sign up link
     visit '/'
@@ -13,6 +13,7 @@ class UserSignupTest < CapybaraIntegrationTest
     # Fill in the sign up form fields
     fill_in 'user[name]', with: name
     fill_in 'user[email]', with: email
+    fill_in 'user[username]', with: username
     fill_in 'user[password]', with: weak_password
     fill_in 'user[password_confirmation]', with: weak_password
 
diff --git a/rails/test/models/user_test.rb b/rails/test/models/user_test.rb
index 5ad8c8d52..2efc2be05 100644
--- a/rails/test/models/user_test.rb
+++ b/rails/test/models/user_test.rb
@@ -9,4 +9,65 @@ class UserTest < ActiveSupport::TestCase
   test "user plans" do
     assert_equal 'basic', @user.plan.name
   end
+
+  test "username uniqueness" do
+    User.create!(
+      email: 'bob@gmail.com', name: 'Another Bob', username: 'Bob', password: 'Abcd1234')
+
+    [
+      'bob',
+      'Bob',
+      'BOB',
+
+    ].each do |disallowed_username|
+      @user.username = disallowed_username
+      refute @user.valid?
+      assert_match /has already been taken/, @user.errors.full_messages.first
+    end
+  end
+
+  test "username validation" do
+    [
+      # No leading or trailing dashes
+      '-bob-',
+      '-bob',
+      'bob-',
+      # No spaces or other chars
+      'bob bobby',
+      'bob$',
+      'bob_bobby',
+      # No Double dashes
+      'bo--b',
+      # Too short
+      'bb',
+      # Too long
+      'b' * 31,
+
+    ].each do |disallowed_username|
+      @user.username = disallowed_username
+      refute @user.valid?
+      assert_match /is not allowed|is too short|is too long/, @user.errors.full_messages.first
+    end
+
+    [
+      'bob',
+      'bob-tables',
+      'Bob ',
+      'BOB',
+      # Max length
+      'b' * 30,
+      # Blank is allowed
+      '',
+      ' ',
+
+    ].each do |allowed_username|
+      @user.username = allowed_username
+      assert @user.valid?
+      assert @user.save
+      # Case is preserved, trailing space is stripped
+      assert_equal allowed_username.strip, @user.reload.username
+    end
+
+  end
+
 end