spec/exponential_spec.rb in distribution-0.7.0 vs spec/exponential_spec.rb in distribution-0.7.1

@@ -74,7 +74,21 @@
 #      end
 #    it_should_behave_like "exponential engine"
 #    
 #    end  
 #  end
-  
+  describe "rng" do
+    it "should default to Kernel#rand if no :random is given" do
+      Random.stub(:rand)
+      Random.should_receive(:rand).and_return(0.5)
+      rng = Distribution::Exponential.rng 1.0
+      rng.call()
+    end
+
+    it "should use a given rng if one is passed during construction" do
+      random = double("random")
+      random.should_receive(:rand).and_return(0.5)
+      rng = Distribution::Exponential::rng 1.0, :random => random
+      rng.call()
+    end
+  end  
 end