1 files changed, 32 insertions, 0 deletions
diff --git a/spec/rubyspec/library/bigdecimal/infinite_spec.rb b/spec/rubyspec/library/bigdecimal/infinite_spec.rb
new file mode 100644
index 0000000000..b218ee371c
--- /dev/null
+++ b/spec/rubyspec/library/bigdecimal/infinite_spec.rb
@@ -0,0 +1,32 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'bigdecimal'
+
+describe "BigDecimal#infinite?" do
+
+  it "returns 1 if self is Infinity" do
+    BigDecimal("Infinity").infinite?.should == 1
+  end
+
+  it "returns -1 if self is -Infinity" do
+    BigDecimal("-Infinity").infinite?.should == -1
+  end
+
+  it "returns not true otherwise" do
+    e2_plus = BigDecimal("2E40001")
+    e3_minus = BigDecimal("3E-20001")
+    really_small_zero = BigDecimal("0E-200000000")
+    really_big_zero = BigDecimal("0E200000000000")
+    e3_minus.infinite?.should == nil
+    e2_plus.infinite?.should == nil
+    really_small_zero.infinite?.should == nil
+    really_big_zero.infinite?.should == nil
+    BigDecimal("0.000000000000000000000000").infinite?.should == nil
+  end
+
+  it "returns not true if self is NaN" do
+    # NaN is a special value which is neither finite nor infinite.
+    nan = BigDecimal("NaN")
+    nan.infinite?.should == nil
+  end
+
+end