Added some Content-Type unit tests

spec/controllers/test_controller_spec.rb

@@ -11,6 +11,10 @@ RSpec.describe(TestController) do
       expect(last_response).to(be_redirect)
     end
 
+    it 'Test base route is an HTML response' do
+      expect(last_response['Content-Type']).to(include('text/html'))
+    end
+
     it 'Test base route Location header points to /test/list' do
       expect(last_response['Location']).to(eq("#{BASE_URL}/test/list"))
     end
@@ -24,6 +28,10 @@ RSpec.describe(TestController) do
       expect(last_response).to(be_ok)
     end
 
+    it 'Test list page is an HTML response' do
+      expect(last_response['Content-Type']).to(include('text/html'))
+    end
+
     it "Test list page contains 'List of tests' on page." do
       expect(last_response.body).to(include('List of tests'))
     end
@@ -37,6 +45,10 @@ RSpec.describe(TestController) do
       expect(last_response).to(be_ok)
     end
 
+    it 'Test add page is an HTML response' do
+      expect(last_response['Content-Type']).to(include('text/html'))
+    end
+
     it "Test add page contains 'Add new test' on page." do
       expect(last_response.body).to(include('Add new test'))
     end