Added tests

spec/models/student_spec.rb

@@ -0,0 +1,29 @@
+require 'rails_helper'
+
+RSpec.describe Student, type: :model do
+  let!(:student) { Student.new(first_name: 'Dwayne', last_name: 'Johnson', grade: 99) }
+
+  describe '#first_name' do
+    it 'returns the student\'s first name' do
+      expect(student.first_name).to eq('Dwayne')
+    end
+  end
+
+  describe '#last_name' do
+    it 'returns the student\'s last name' do
+      expect(student.last_name).to eq('Johnson')
+    end
+  end
+
+  describe '#grade' do
+    it 'returns the student\'s grade' do
+      expect(student.grade).to eq(99)
+    end
+  end
+
+  describe '#to_s' do
+    it 'has a #to_s method that returns the student\'s full name' do
+      expect(student.to_s).to eq('Dwayne Johnson')
+    end
+  end
+end