Feature/Ability to use configuration configuration with default setti…

…ngs without block (#23)

* Updated OnStrum::Healthcheck.configure, tests
* Updated gem documentation

README.md

@@ -155,7 +155,7 @@ Please note, to start using this middleware you should configure `OnStrum::Healt
 require 'on_strum/healthcheck'
 
 # Configuring OnStrum::Healthcheck with default settings
-OnStrum::Healthcheck.configure {}
+OnStrum::Healthcheck.configure
 
 Rack::Builder.app do
   use OnStrum::Healthcheck::RackMiddleware
@@ -169,7 +169,7 @@ end
 require 'on_strum/healthcheck'
 
 # Configuring OnStrum::Healthcheck with default settings
-OnStrum::Healthcheck.configure {}
+OnStrum::Healthcheck.configure
 
 class YourApplication < Roda
   use OnStrum::Healthcheck::RackMiddleware
@@ -184,7 +184,7 @@ end
 require 'on_strum/healthcheck'
 
 # Configuring OnStrum::Healthcheck with default settings
-OnStrum::Healthcheck.configure {}
+OnStrum::Healthcheck.configure
 ```
 
 ```ruby
@@ -203,7 +203,7 @@ end
 require 'on_strum/healthcheck'
 
 # Configuring OnStrum::Healthcheck with default settings
-OnStrum::Healthcheck.configure {}
+OnStrum::Healthcheck.configure
 ```
 
 ```ruby

lib/on_strum/healthcheck.rb

@@ -14,6 +14,8 @@ def configuration(&block)
       end
 
       def configure(&block)
+        return configuration {} unless block # rubocop:disable Lint/EmptyBlock
+
         configuration(&block)
       end
 

spec/on_strum/healthcheck_spec.rb

@@ -23,8 +23,27 @@
     let(:config_block) { nil }
 
     context 'without block' do
-      it { expect(configuration).to be_nil }
-      it { expect { configuration }.not_to change(described_class, :configuration) }
+      it 'sets default attributes into configuration instance' do
+        expect { configuration }
+          .to change(described_class, :configuration)
+          .from(nil)
+          .to(be_instance_of(OnStrum::Healthcheck::Configuration))
+        expect(configuration).to be_an_instance_of(OnStrum::Healthcheck::Configuration)
+        expect(configuration.services).to eq({})
+        expect(configuration.services_startup).to eq([])
+        expect(configuration.services_liveness).to eq([])
+        expect(configuration.services_readiness).to eq([])
+        expect(configuration.endpoints_namespace).to eq(OnStrum::Healthcheck::Configuration::ENDPOINTS_NAMESPACE)
+        expect(configuration.endpoint_startup).to eq(OnStrum::Healthcheck::Configuration::ENDPOINT_STARTUP)
+        expect(configuration.endpoint_liveness).to eq(OnStrum::Healthcheck::Configuration::ENDPOINT_LIVENESS)
+        expect(configuration.endpoint_readiness).to eq(OnStrum::Healthcheck::Configuration::ENDPOINT_READINESS)
+        expect(configuration.endpoint_startup_status_success).to eq(OnStrum::Healthcheck::Configuration::DEFAULT_HTTP_STATUS_SUCCESS)
+        expect(configuration.endpoint_liveness_status_success).to eq(OnStrum::Healthcheck::Configuration::DEFAULT_HTTP_STATUS_SUCCESS)
+        expect(configuration.endpoint_readiness_status_success).to eq(OnStrum::Healthcheck::Configuration::DEFAULT_HTTP_STATUS_SUCCESS)
+        expect(configuration.endpoint_startup_status_failure).to eq(OnStrum::Healthcheck::Configuration::DEFAULT_HTTP_STATUS_FAILURE)
+        expect(configuration.endpoint_liveness_status_failure).to eq(OnStrum::Healthcheck::Configuration::DEFAULT_HTTP_STATUS_FAILURE)
+        expect(configuration.endpoint_readiness_status_failure).to eq(OnStrum::Healthcheck::Configuration::DEFAULT_HTTP_STATUS_FAILURE)
+      end
     end
 
     context 'with block' do