✨ Don't set default experiment for classes when includeing Scientist::Experiment

lib/scientist/experiment.rb

@@ -10,10 +10,15 @@ module Scientist::Experiment
   attr_accessor :raise_on_mismatches
 
   def self.included(base)
-    self.set_default(base) if base.instance_of?(Class)
+    set_default(base) if base.instance_of?(Class)
     base.extend RaiseOnMismatch
   end
 
+  # Set this class as default scientist experiment when included.
+  def self.set_as_default_scientist_experiment(set_default_class)
+    set_default(Scientist::Default) unless set_default_class
+  end
+
   # Instantiate a new experiment (using the class given to the .set_default method).
   def self.new(name)
     (@experiment_klass || Scientist::Default).new(name)

test/scientist/experiment_test.rb

@@ -31,6 +31,19 @@ def publish(result)
     @ex = Fake.new
   end
 
+  it "does not set as default when default_scientist_experiment is passed as false" do
+    klass = Class.new do
+      include Scientist::Experiment
+
+      Scientist::Experiment.set_as_default_scientist_experiment(false)
+
+      def initialize(name)
+      end
+    end
+
+    assert_kind_of Scientist::Default, Scientist::Experiment.new("hello")
+  end
+
   it "sets the default on inclusion" do
     klass = Class.new do
       include Scientist::Experiment