Disable rainbow during SimpleExecutor specs to have consistence

spec/lib/system_check/simple_executor_spec.rb

@@ -84,6 +84,15 @@ describe SystemCheck::SimpleExecutor, lib: true do
     end
   end
 
+  before do
+    @rainbow = Rainbow.enabled
+    Rainbow.enabled = false
+  end
+
+  after do
+    Rainbow.enabled = @rainbow
+  end
+
   describe '#component' do
     it 'returns stored component name' do
       expect(subject.component).to eq('Test')
@@ -147,14 +156,14 @@ describe SystemCheck::SimpleExecutor, lib: true do
     context 'when check pass' do
       it 'prints yes' do
         expect_any_instance_of(SimpleCheck).to receive(:check?).and_call_original
-        expect { subject.run_check(SimpleCheck) }.to output(/ \.\.\. \e\[32myes/).to_stdout
+        expect { subject.run_check(SimpleCheck) }.to output(/ \.\.\. yes/).to_stdout
       end
     end
 
     context 'when check fails' do
       it 'prints no' do
         expect_any_instance_of(OtherCheck).to receive(:check?).and_call_original
-        expect { subject.run_check(OtherCheck) }.to output(/ \.\.\. \e\[31mno/).to_stdout
+        expect { subject.run_check(OtherCheck) }.to output(/ \.\.\. no/).to_stdout
       end
 
       it 'displays error message from #show_error' do