Added some Content-Type unit tests

spec/controllers/hardware_controller_spec.rb

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