1 files changed, 21 insertions, 0 deletions
diff --git a/spec/ruby/library/mathn/bignum/exponent_spec.rb b/spec/ruby/library/mathn/bignum/exponent_spec.rb
new file mode 100644
index 0000000000..758c2f27fd
--- /dev/null
+++ b/spec/ruby/library/mathn/bignum/exponent_spec.rb
@@ -0,0 +1,21 @@
+require File.expand_path('../../../../spec_helper', __FILE__)
+
+ruby_version_is ''...'2.5' do
+  require 'mathn'
+
+  describe "Bignum#**" do
+    before :each do
+      @bignum = bignum_value(47)
+    end
+
+    it "returns self raised to other (positive) power" do
+      (@bignum ** 4).should == 7237005577332262361485077344629993318496048279512298547155833600056910050625
+      (@bignum ** 1.2).should be_close(57262152889751597425762.57804, TOLERANCE)
+    end
+
+    it "returns a complex number when negative and raised to a fractional power" do
+      ((-@bignum) ** (1/3)).should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
+      ((-@bignum) ** (1.0/3)).should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
+    end
+  end
+end