Add students controller, test and view to display student cash balance

app/controllers/students_controller.rb

@@ -0,0 +1,11 @@
+class StudentsController < ApplicationController
+  before_action :set_student, only: %i[show]
+
+  def show; end
+
+  private
+
+  def set_student
+    @student = Student.find(params[:id])
+  end
+end

app/views/students/show.html.erb

@@ -0,0 +1,7 @@
+<div>
+  <h1>Email: <%= @student.email %></h1>
+</div>
+
+<div>
+  <h1>Cash Balance: <%= number_to_currency(@student&.portfolio&.cash_balance) %></h1>
+</div>

config/routes.rb

@@ -18,6 +18,7 @@
   devise_for :users
   resources :classrooms
   resources :schools
+  resources :students, only: [:show]
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.

test/controllers/students_controller_test.rb

@@ -0,0 +1,12 @@
+require 'test_helper'
+
+class StudentsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    @student = users(:one)
+  end
+
+  test 'should show student' do
+    get student_url(@student)
+    assert_response :success
+  end
+end