Differentiate shared test context using options hash instead of subject.

+ fix typos, and capitalization
+ point configuration to `gitlab.rb` as well

doc/user/admin_area/monitoring/health_check.md

@@ -16,8 +16,8 @@ traffic until the system is ready or restart the container as needed.
 
 ## IP Whitelist
 
-To access monitoring resources client IP needs to be included in the whitelist.
-To add or remove hosts or ip ranges from the list you can edit `gitlab.yml`.
+To access monitoring resources the client IP needs to be included in the whitelist.
+To add or remove hosts or IP ranges from the list you can edit `gitlab.rb` or `gitlab.yml`.
 
 Example whitelist configuration:
 ```yaml

spec/controllers/health_check_controller_spec.rb

@@ -36,7 +36,7 @@ describe HealthCheckController do
           expect(response.content_type).to eq 'text/plain'
         end
 
-        it 'supports successful plaintest response' do
+        it 'supports passing the token in query params' do
           get :index, token: token
 
           expect(response).to be_success
@@ -50,7 +50,7 @@ describe HealthCheckController do
         allow(Gitlab::RequestContext).to receive(:client_ip).and_return(whitelisted_ip)
       end
 
-      it 'supports successful plaintest response' do
+      it 'supports successful plaintext response' do
         get :index
 
         expect(response).to be_success
@@ -97,7 +97,7 @@ describe HealthCheckController do
         allow(Gitlab::RequestContext).to receive(:client_ip).and_return(whitelisted_ip)
       end
 
-      it 'supports failure plaintest response' do
+      it 'supports failure plaintext response' do
         get :index
 
         expect(response).to have_http_status(500)

spec/controllers/health_controller_spec.rb

@@ -15,7 +15,9 @@ describe HealthController do
 
   describe '#readiness' do
     shared_context 'endpoint responding with readiness data' do
-      subject { get :readiness }
+      let(:request_params) { {} }
+
+      subject { get :readiness, request_params }
 
       it 'responds with readiness checks data' do
         subject
@@ -58,7 +60,7 @@ describe HealthController do
 
       context 'token passed as URL param' do
         it_behaves_like 'endpoint responding with readiness data' do
-          subject { get :readiness, token: token }
+          let(:request_params) { { token: token } }
         end
       end
     end