add users controller and intermediate username step

test/controllers/users_controller_test.rb

@@ -0,0 +1,18 @@
+require 'test_helper'
+
+class UsersControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    @user = users(:one)
+  end
+
+  test "should get edit" do
+    get edit_user_url(@user)
+    assert_response :success
+  end
+
+  test "should update user" do
+    patch user_url(@user), params: { user: { username: @user.username } }
+    assert_redirected_to user_url(@user)
+  end
+
+end