fix: Capture correct descriptions for RSpec one-liner examples (#1712)

Author: americodls

instrumentation/rspec/lib/opentelemetry/instrumentation/rspec/formatter.rb

@@ -69,9 +69,15 @@ def example_started(notification)
 
         def example_finished(notification)
           pop_and_finalize_span do |span|
-            result = notification.example.execution_result
-
-            span.set_attribute('rspec.example.result', result.status.to_s)
+            example = notification.example
+            result = example.execution_result
+
+            # Update name and full_description for one-liner examples where description is generated after execution
+            span.name = example.description
+            span.add_attributes(
+              'rspec.example.full_description' => example.full_description.to_s,
+              'rspec.example.result' => result.status.to_s
+            )
 
             add_exception_and_failures(span, result.exception)
           end

instrumentation/rspec/test/opentelemetry/instrumentation/rspec/formatter_test.rb

@@ -356,6 +356,26 @@ def run_example(...)
         end
       end
     end
+
+    describe 'one-liner syntax' do
+      subject do
+        run_example do
+          it { is_expected.not_to be_nil }
+        end
+      end
+
+      it 'has a name that matches the auto-generated description' do
+        _(subject.name).must_equal 'is expected not to be nil'
+      end
+
+      it 'has a full_description attribute that includes the group description' do
+        _(subject.attributes['rspec.example.full_description']).must_equal 'group one is expected not to be nil'
+      end
+
+      it 'records when the example passes' do
+        _(subject.attributes['rspec.example.result']).must_equal 'passed'
+      end
+    end
   end
 
   describe 'using a custom tracer provider' do