1 files changed, 19 insertions, 0 deletions
diff --git a/spec/ruby/library/prime/integer/prime_division_spec.rb b/spec/ruby/library/prime/integer/prime_division_spec.rb
new file mode 100644
index 0000000000..5631b22d0a
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+++ b/spec/ruby/library/prime/integer/prime_division_spec.rb
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+require_relative '../../../spec_helper'
+require 'prime'
+
+describe "Integer#prime_division" do
+  it "returns an array of a prime factor and a corresponding exponent" do
+    (2*3*5*7*11*13*17).prime_division.should ==
+      [[2,1], [3,1], [5,1], [7,1], [11,1], [13,1], [17,1]]
+  end
+
+  it "returns an empty array for 1" do
+    1.prime_division.should == []
+  end
+  it "returns an empty array for -1" do
+    -1.prime_division.should == [[-1, 1]]
+  end
+  it "raises ZeroDivisionError for 0" do
+    -> { 0.prime_division }.should.raise(ZeroDivisionError)
+  end
+end