1 files changed, 13 insertions, 0 deletions
diff --git a/spec/ruby/library/prime/integer/from_prime_division_spec.rb b/spec/ruby/library/prime/integer/from_prime_division_spec.rb
new file mode 100644
index 0000000000..6ef98a2ecf
--- /dev/null
+++ b/spec/ruby/library/prime/integer/from_prime_division_spec.rb
@@ -0,0 +1,13 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+require 'prime'
+
+describe "Integer.from_prime_division" do
+  it "returns the product of the given factorization" do
+    Integer.from_prime_division([[2,3], [3,3], [5,3], [7,3], [11,3], [13,3], [17,3]]).
+      should == 2**3 * 3**3 * 5**3 * 7**3 * 11**3 * 13**3 * 17**3
+  end
+
+  it "returns 1 for an empty factorization" do
+    Integer.from_prime_division([]).should == 1
+  end
+end