update runnable context to support use when describing non-runnables

Author: Jammjammjamm

spec/runnable_context.rb

@@ -5,7 +5,10 @@
   let(:test_session) { repo_create(:test_session, test_suite_id: suite_id) }
 
   before do
-    allow(described_class).to receive(:suite).and_return(suite) if described_class.parent.nil?
+    if !(described_class.singleton_class < Inferno::DSL::Runnable) ||
+       described_class.parent.nil?
+      allow(described_class).to receive(:suite).and_return(suite)
+    end
   rescue NameError
     raise StandardError, "No suite id defined. Add `let(:suite_id) { 'your_suite_id' }` to the spec"
   end