Fixed: Option not resolving default again after reset.

lib/ddtrace/configuration/option.rb

@@ -24,7 +24,8 @@ def get
       end
 
       def reset
-        set(definition.default_value)
+        @is_set = false
+        @value = nil
       end
     end
   end

spec/ddtrace/configuration/option_spec.rb

@@ -62,7 +62,11 @@
         option.set(value)
       end
 
-      it { is_expected.to be(default_value) }
+      context 'causes #get' do
+        subject(:get) { option.get }
+        before(:each) { reset }
+        it { is_expected.to be(default_value) }
+      end
     end
   end
 end

spec/ddtrace/contrib/analytics_examples.rb

@@ -1,6 +1,13 @@
 require 'ddtrace/ext/analytics'
 
 RSpec.shared_examples_for 'analytics for integration' do |options = { ignore_global_flag: true }|
+  around do |example|
+    # Reset before and after each example; don't allow global state to linger.
+    Datadog.configuration.reset_options!
+    example.run
+    Datadog.configuration.reset_options!
+  end
+
   context 'when not configured' do
     context 'and the global flag is not set' do
       it 'is not included in the tags' do