1 files changed, 20 insertions, 1 deletions
diff --git a/spec/ruby/core/array/sum_spec.rb b/spec/ruby/core/array/sum_spec.rb
index 8ca8353a67..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
@@ -9,8 +10,12 @@ 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-2.4.0#L6208-L6214
+  # 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 }
@@ -68,4 +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