diff options
Diffstat (limited to 'spec/ruby/core/array/sum_spec.rb')
-rw-r--r-- | spec/ruby/core/array/sum_spec.rb | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/spec/ruby/core/array/sum_spec.rb b/spec/ruby/core/array/sum_spec.rb index 39c769d328..06abe06135 100644 --- a/spec/ruby/core/array/sum_spec.rb +++ b/spec/ruby/core/array/sum_spec.rb @@ -1,4 +1,5 @@ require_relative '../../spec_helper' +require_relative 'shared/iterable_and_tolerating_size_increasing' describe "Array#sum" do it "returns the sum of elements" do @@ -9,6 +10,39 @@ describe "Array#sum" do [1, 2, 3].sum { |i| i * 10 }.should == 60 end + it "doesn't apply the block init" do + [1, 2, 3].sum(1) { |i| i * 10 }.should == 61 + end + + # https://bugs.ruby-lang.org/issues/12217 + # https://github.com/ruby/ruby/blob/master/doc/ChangeLog/ChangeLog-2.4.0#L6208-L6214 + it "uses Kahan's compensated summation algorithm for precise sum of float numbers" do + floats = [2.7800000000000002, 5.0, 2.5, 4.44, 3.89, 3.89, 4.44, 7.78, 5.0, 2.7800000000000002, 5.0, 2.5] + naive_sum = floats.reduce { |sum, e| sum + e } + naive_sum.should == 50.00000000000001 + floats.sum.should == 50.0 + end + + it "handles infinite values and NaN" do + [1.0, Float::INFINITY].sum.should == Float::INFINITY + [1.0, -Float::INFINITY].sum.should == -Float::INFINITY + [1.0, Float::NAN].sum.should.nan? + + [Float::INFINITY, 1.0].sum.should == Float::INFINITY + [-Float::INFINITY, 1.0].sum.should == -Float::INFINITY + [Float::NAN, 1.0].sum.should.nan? + + [Float::NAN, Float::INFINITY].sum.should.nan? + [Float::INFINITY, Float::NAN].sum.should.nan? + + [Float::INFINITY, -Float::INFINITY].sum.should.nan? + [-Float::INFINITY, Float::INFINITY].sum.should.nan? + + [Float::INFINITY, Float::INFINITY].sum.should == Float::INFINITY + [-Float::INFINITY, -Float::INFINITY].sum.should == -Float::INFINITY + [Float::NAN, Float::NAN].sum.should.nan? + end + it "returns init value if array is empty" do [].sum(-1).should == -1 end @@ -39,4 +73,18 @@ describe "Array#sum" do a.should_receive(:+).with(b).and_return(42) [b].sum(a).should == 42 end + + ruby_bug '#19530', ''...'3.3' do + it "calls + on the init value" do + a = mock("a") + b = mock("b") + a.should_receive(:+).with(42).and_return(b) + [42].sum(a).should == b + end + end +end + +describe "Array#sum" do + @value_to_return = -> _ { 1 } + it_behaves_like :array_iterable_and_tolerating_size_increasing, :sum end |