fix(Instrumentation-HttpClient): improve test coverage

instrumentation/http_client/test/instrumentation/http_client/instrumentation_test.rb

@@ -11,8 +11,6 @@
 describe OpenTelemetry::Instrumentation::HttpClient do
   let(:instrumentation) { OpenTelemetry::Instrumentation::HttpClient::Instrumentation.instance }
 
-  before { skip unless ENV['BUNDLE_GEMFILE'].include?('stable') }
-
   it 'has #name' do
     _(instrumentation.name).must_equal 'OpenTelemetry::Instrumentation::HttpClient'
   end
@@ -22,9 +20,23 @@
     _(instrumentation.version).wont_be_empty
   end
 
-  describe '#install' do
-    it 'accepts argument' do
-      instrumentation.install({})
+  describe 'determine_semconv' do
+    it 'returns "dup" when OTEL_SEMCONV_STABILITY_OPT_IN includes http/dup' do
+      OpenTelemetry::TestHelpers.with_env('OTEL_SEMCONV_STABILITY_OPT_IN' => 'http/dup') do
+        _(instrumentation.send(:determine_semconv)).must_equal('dup')
+      end
+    end
+
+    it 'returns "old" when OTEL_SEMCONV_STABILITY_OPT_IN is old' do
+      OpenTelemetry::TestHelpers.with_env('OTEL_SEMCONV_STABILITY_OPT_IN' => 'old') do
+        _(instrumentation.send(:determine_semconv)).must_equal('old')
+      end
+    end
+
+    it 'returns "stable" when OTEL_SEMCONV_STABILITY_OPT_IN is empty' do
+      OpenTelemetry::TestHelpers.with_env('OTEL_SEMCONV_STABILITY_OPT_IN' => '') do
+        _(instrumentation.send(:determine_semconv)).must_equal('stable')
+      end
     end
   end
 end