diff options
Diffstat (limited to 'spec/rubyspec/core/float/constants_spec.rb')
-rw-r--r-- | spec/rubyspec/core/float/constants_spec.rb | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/spec/rubyspec/core/float/constants_spec.rb b/spec/rubyspec/core/float/constants_spec.rb new file mode 100644 index 0000000000..31930b125a --- /dev/null +++ b/spec/rubyspec/core/float/constants_spec.rb @@ -0,0 +1,55 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Float constant" do + it "DIG is 15" do + Float::DIG.should == 15 + end + + it "EPSILON is 2.220446049250313e-16" do + Float::EPSILON.should == 2.0 ** -52 + Float::EPSILON.should == 2.220446049250313e-16 + end + + it "MANT_DIG is 53" do + Float::MANT_DIG.should == 53 + end + + it "MAX_10_EXP is 308" do + Float::MAX_10_EXP.should == 308 + end + + it "MIN_10_EXP is -308" do + Float::MIN_10_EXP.should == -307 + end + + it "MAX_EXP is 1024" do + Float::MAX_EXP.should == 1024 + end + + it "MIN_EXP is -1021" do + Float::MIN_EXP.should == -1021 + end + + it "MAX is 1.7976931348623157e+308" do + # See https://en.wikipedia.org/wiki/Double-precision_floating-point_format#Double-precision_examples + Float::MAX.should == (1 + (1 - (2 ** -52))) * (2.0 ** 1023) + Float::MAX.should == 1.7976931348623157e+308 + end + + it "MIN is 2.2250738585072014e-308" do + Float::MIN.should == (2.0 ** -1022) + Float::MIN.should == 2.2250738585072014e-308 + end + + it "RADIX is 2" do + Float::RADIX.should == 2 + end + + it "INFINITY is the positive infinity" do + Float::INFINITY.infinite?.should == 1 + end + + it "NAN is 'not a number'" do + Float::NAN.nan?.should be_true + end +end |