Add trace_with testing for unified_tracer

spec/datadog/tracing/contrib/graphql/loading_spec.rb

@@ -0,0 +1,31 @@
+RSpec.describe 'loading graphql' do
+  context 'then datadog' do
+    let(:code) do
+      <<-E
+        require "graphql"
+        require "datadog"
+        exit 0
+      E
+    end
+
+    it 'loads successfully by itself' do
+      rv = system("ruby -e #{Shellwords.shellescape(code)}")
+      expect(rv).to be true
+    end
+  end
+
+  context 'after datadog' do
+    let(:code) do
+      <<-E
+        require "datadog"
+        require "graphql"
+        exit 0
+      E
+    end
+
+    it 'loads successfully by itself' do
+      rv = system("ruby -e #{Shellwords.shellescape(code)}")
+      expect(rv).to be true
+    end
+  end
+end

spec/datadog/tracing/contrib/graphql/unified_trace_patcher_spec.rb

@@ -23,4 +23,22 @@
         end
       end
     end
+
+    # Not specific to unified trace patcher,
+    # But this should work the same way without the need to require the tracer in the schema.
+    describe '#trace_with' do
+      context 'with schema using trace_with' do
+        it_behaves_like 'graphql instrumentation with unified naming convention trace' do
+          before do
+            # Monkey patch the schema to use the unified tracer
+            # As we're not adding a new method, we cannot use allow(...).to receive(...)
+            # rubocop:disable Lint/ConstantDefinitionInBlock, RSpec/LeakyConstantDeclaration
+            class TestGraphQLSchema
+              trace_with Datadog::Tracing::Contrib::GraphQL::UnifiedTrace
+            end
+            # rubocop:enable Lint/ConstantDefinitionInBlock, RSpec/LeakyConstantDeclaration
+          end
+        end
+      end
+    end
   end