1 files changed, 38 insertions, 0 deletions
diff --git a/spec/ruby/library/bigdecimal/exponent_spec.rb b/spec/ruby/library/bigdecimal/exponent_spec.rb
new file mode 100644
index 0000000000..6bb678d4ed
--- /dev/null
+++ b/spec/ruby/library/bigdecimal/exponent_spec.rb
@@ -0,0 +1,38 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/power', __FILE__)
+require 'bigdecimal'
+
+describe "BigDecimal#**" do
+  it_behaves_like(:bigdecimal_power, :**)
+end
+
+describe "BigDecimal#exponent" do
+
+  it "returns an Integer" do
+    BigDecimal("2E100000000").exponent.kind_of?(Integer).should == true
+    BigDecimal("2E-999").exponent.kind_of?(Integer).should == true
+  end
+
+  it "is n if number can be represented as 0.xxx*10**n" do
+    BigDecimal("2E1000").exponent.should == 1001
+    BigDecimal("1234567E10").exponent.should == 17
+  end
+
+# commenting this spec out after discussion with Defiler, since it seems to be an MRI bug, not a real feature
+=begin
+  platform_is wordsize: 32 do
+    # TODO: write specs for both 32 and 64 bit
+    it "returns 0 if exponent can't be represented as Fixnum" do
+      BigDecimal("2E1000000000000000").exponent.should == 0
+      BigDecimal("-5E-999999999999999").exponent.should == 0
+    end
+  end
+=end
+
+  it "returns 0 if self is 0" do
+    BigDecimal("0").exponent.should == 0
+    BigDecimal("+0").exponent.should == 0
+    BigDecimal("-0").exponent.should == 0
+  end
+
+end