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Diffstat (limited to 'spec/ruby/library/datetime/subtract_spec.rb')
| -rw-r--r-- | spec/ruby/library/datetime/subtract_spec.rb | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/spec/ruby/library/datetime/subtract_spec.rb b/spec/ruby/library/datetime/subtract_spec.rb new file mode 100644 index 0000000000..ba01f4eff6 --- /dev/null +++ b/spec/ruby/library/datetime/subtract_spec.rb @@ -0,0 +1,19 @@ +require_relative '../../spec_helper' +require 'date' + +describe "DateTime#-" do + it "is able to subtract sub-millisecond precision values" do + date = DateTime.new(2017) + diff = Rational(123456789, 24*60*60*1000*1000) + ((date + diff) - date).should == diff + (date - (date + diff)).should == -diff + (date - (date - diff)).should == diff + ((date - diff) - date).should == -diff + end + + it "correctly calculates sub-millisecond time differences" do #5493 + dt1 = DateTime.new(2018, 1, 1, 0, 0, 30) + dt2 = DateTime.new(2018, 1, 1, 0, 1, 29.000001) + ((dt2 - dt1) * 24 * 60 * 60).should == 59.000001 + end +end |