1 files changed, 29 insertions, 0 deletions
diff --git a/spec/ruby/core/bignum/exponent_spec.rb b/spec/ruby/core/bignum/exponent_spec.rb
new file mode 100644
index 0000000000..f69da833fd
--- /dev/null
+++ b/spec/ruby/core/bignum/exponent_spec.rb
@@ -0,0 +1,29 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Bignum#**" do
+  before :each do
+    @bignum = bignum_value(47)
+  end
+
+  it "returns self raised to other power" do
+    (@bignum ** 4).should == 7237005577332262361485077344629993318496048279512298547155833600056910050625
+    (@bignum ** 1.2).should be_close(57262152889751597425762.57804, TOLERANCE)
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda { @bignum ** mock('10') }.should raise_error
+    lambda { @bignum ** "10" }.should raise_error
+    lambda { @bignum ** :symbol }.should raise_error
+  end
+
+  it "switch to a Float when the values is too big" do
+    flt = (@bignum ** @bignum)
+    flt.should be_kind_of(Float)
+    flt.infinite?.should == 1
+  end
+
+  it "returns a complex number when negative and raised to a fractional power" do
+    ((-@bignum) ** (1.0/3))      .should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
+    ((-@bignum) ** Rational(1,3)).should be_close(Complex(1048576,1816186.907597341), TOLERANCE)
+  end
+end