1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/library/bigdecimal/mode_spec.rb b/spec/ruby/library/bigdecimal/mode_spec.rb
new file mode 100644
index 0000000000..d88ac61aaf
--- /dev/null
+++ b/spec/ruby/library/bigdecimal/mode_spec.rb
@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'bigdecimal'
+
+describe "BigDecimal.mode" do
+  #the default value of BigDecimal exception constants is false
+  after :each do
+    BigDecimal.mode(BigDecimal::EXCEPTION_NaN, false)
+    BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, false)
+    BigDecimal.mode(BigDecimal::EXCEPTION_UNDERFLOW, false)
+    BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, false)
+    BigDecimal.mode(BigDecimal::EXCEPTION_ZERODIVIDE, false)
+  end
+
+  it "returns the appropriate value and continue the computation if the flag is false" do
+    BigDecimal("NaN").add(BigDecimal("1"),0).nan?.should == true
+    BigDecimal("0").add(BigDecimal("Infinity"),0).should == BigDecimal("Infinity")
+    BigDecimal("1").quo(BigDecimal("0")).should == BigDecimal("Infinity")
+  end
+
+  it "returns Infinity when too big" do
+    BigDecimal("1E11111111111111111111").should == BigDecimal("Infinity")
+    (BigDecimal("1E1000000000000000000")**10).should == BigDecimal("Infinity")
+  end
+
+  it "raise an exception if the flag is true" do
+    BigDecimal.mode(BigDecimal::EXCEPTION_NaN, true)
+    lambda { BigDecimal("NaN").add(BigDecimal("1"),0) }.should raise_error(FloatDomainError)
+    BigDecimal.mode(BigDecimal::EXCEPTION_INFINITY, true)
+    lambda { BigDecimal("0").add(BigDecimal("Infinity"),0) }.should raise_error(FloatDomainError)
+    BigDecimal.mode(BigDecimal::EXCEPTION_ZERODIVIDE, true)
+    lambda { BigDecimal("1").quo(BigDecimal("0")) }.should raise_error(FloatDomainError)
+    BigDecimal.mode(BigDecimal::EXCEPTION_OVERFLOW, true)
+    lambda { BigDecimal("1E11111111111111111111") }.should raise_error(FloatDomainError)
+    lambda { (BigDecimal("1E1000000000000000000")**10) }.should raise_error(FloatDomainError)
+  end
+end