unit test and CHANGELOG entry for 2870

unit test branch coverage and a CHANGELOG bugfix writeup to accompany PR
2870

CHANGELOG.md

@@ -78,6 +78,10 @@ Version 9.14.0 adds Apache Kafka instrumentation for the rdkafka and ruby-kafka
 
   To address a recent Bundler deprecation warning, we started using `Bundler.rubygems.installed_specs` instead of `Bundler.rubygems.all_specs` in environments that seemed appropriate. We discovered the version constraint we used was too low. Now, rather than check the version, we check for the method using `respond_to?`. [PR#2853](https://github.com/newrelic/newrelic-ruby-agent/pull/2853)
 
+- **Bugfix: Support view_component v3.15.0+**
+
+  Previously the agent had been making use of a private API to obtain a component identifier value. This private API was dropped in v3.15.0 of view_component, resulting in errors from the New Relic Ruby agent's continued attempts to use it. Many thanks to community member [@navidemad](https://github.com/navidemad) for bringing this issue to our attention and supplying a bugfix with [PR#2870](https://github.com/newrelic/newrelic-ruby-agent/pull/2870).
+
 ## v9.13.0
 
 Version 9.13.0 enhances support for AWS Lambda functions, adds experimental OpenSearch instrumentation, updates framework detection, silences a Bundler deprecation warning, fixes Falcon dispatcher detection, fixes a bug with Redis instrumentation installation, and addresses a JRuby-specific concurrency issue.

test/multiverse/suites/view_component/view_component_instrumentation_test.rb

@@ -57,4 +57,15 @@ def test_error_raised
       assert_equal(500, get('/view_components'))
     end
   end
+
+  # Test metric name being built when the controller class doesn't respond to :identifier
+  # https://github.com/newrelic/newrelic-ruby-agent/pull/2870
+  def test_the_metric_name_omits_the_identifier_when_absent
+    in_transaction do |txn|
+      FAKE_CLASS.render_in_with_tracing { 11 * 38 }
+      actual_name = txn.segments.last.name
+
+      assert_equal 'View/component/DummyViewComponentInstrumentationClass', actual_name
+    end
+  end
 end