Add bin and edit workflow

bin/gems/facets-3.1.0/test/standard/math/test_factorial.rb

@@ -0,0 +1,13 @@
+require 'facets/math/factorial'
+
+test_case Math do
+
+  class_method :factorial do
+    fac = 1
+    1.upto(100) do |i|
+      fac *= i
+      Math.factorial(i).assert == fac
+    end
+  end
+
+end