add specific exception class

lib/inferno/dsl/runnable.rb

@@ -1,6 +1,7 @@
 require_relative 'configurable'
 require_relative 'input_output_handling'
 require_relative 'resume_test_route'
+require_relative '../exceptions'
 require_relative '../utils/markdown_formatter'
 
 module Inferno
@@ -202,7 +203,7 @@ def id(new_id = nil)
 
         final_id = "#{prefix}#{@base_id}"
 
-        raise StandardError, "ID '#{final_id}' exceeds the maximum id length of 255 characters" if final_id.length > 255
+        raise Exceptions::InvalidRunnableIdException, final_id if final_id.length > 255
 
         @id = final_id
       end

lib/inferno/exceptions.rb

@@ -113,5 +113,11 @@ def initialize(name, expected_class_names, actual_class)
         super("Expected '#{name}' to be a #{expected_class_names}, but found a #{actual_class.name}.")
       end
     end
+
+    class InvalidRunnableIdException < StandardError
+      def initialize(id)
+        super("ID '#{id}' exceeds the maximum id length of 255 characters")
+      end
+    end
   end
 end

spec/inferno/dsl/runnable_spec.rb

@@ -190,7 +190,9 @@
 
   describe '.id' do
     it 'raises an error if the id is longer than 255 characters' do
-      expect { Class.new(Inferno::Test).id('a' * 256) }.to raise_error(StandardError, /length of 255 characters/)
+      expect do
+        Class.new(Inferno::Test).id('a' * 256)
+      end.to raise_error(Inferno::Exceptions::InvalidRunnableIdException, /length of 255 characters/)
     end
   end
 end