1 files changed, 33 insertions, 15 deletions
diff --git a/spec/ruby/core/integer/round_spec.rb b/spec/ruby/core/integer/round_spec.rb
index 5cc9aa3881..5a46e6cba6 100644
--- a/spec/ruby/core/integer/round_spec.rb
+++ b/spec/ruby/core/integer/round_spec.rb
@@ -1,10 +1,12 @@
 require File.expand_path('../../../spec_helper', __FILE__)
 require File.expand_path('../shared/to_i', __FILE__)
+require File.expand_path('../shared/integer_rounding', __FILE__)
 
 describe "Integer#round" do
   it_behaves_like(:integer_to_i, :round)
+  it_behaves_like(:integer_rounding_positive_precision, :round)
 
-  ruby_version_is ""..."2.5" do
+  ruby_version_is ""..."2.5" do # Not just since 2.4
     it "rounds itself as a float if passed a positive precision" do
       [2, -4, 10**70, -10**100].each do |v|
         v.round(42).should eql(v.to_f)
@@ -12,20 +14,6 @@ describe "Integer#round" do
     end
   end
 
-  ruby_version_is "2.5" do
-    it "returns itself if passed a positive precision" do
-      [2, -4, 10**70, -10**100].each do |v|
-        v.round(42).should eql(v)
-      end
-    end
-  end
-
-  it "returns itself if passed zero" do
-    [2, -4, 10**70, -10**100].each do |v|
-      v.round(0).should eql(v)
-    end
-  end
-
   # redmine:5228
   it "returns itself rounded if passed a negative value" do
     +249.round(-2).should eql(+200)
@@ -74,4 +62,34 @@ describe "Integer#round" do
     obj.stub!(:to_int).and_return([])
     lambda { 42.round(obj) }.should raise_error(TypeError)
   end
+
+  ruby_version_is "2.4" do
+    it "returns different rounded values depending on the half option" do
+      25.round(-1, half: :up).should      eql(30)
+      25.round(-1, half: :down).should    eql(20)
+      25.round(-1, half: :even).should    eql(20)
+      35.round(-1, half: :up).should      eql(40)
+      35.round(-1, half: :down).should    eql(30)
+      35.round(-1, half: :even).should    eql(40)
+      (-25).round(-1, half: :up).should   eql(-30)
+      (-25).round(-1, half: :down).should eql(-20)
+      (-25).round(-1, half: :even).should eql(-20)
+    end
+  end
+
+  ruby_version_is "2.4"..."2.5" do
+    it "returns itself as a float if passed a positive precision and the half option" do
+      35.round(1, half: :up).should      eql(35.0)
+      35.round(1, half: :down).should    eql(35.0)
+      35.round(1, half: :even).should    eql(35.0)
+    end
+  end
+
+  ruby_version_is "2.5" do
+    it "returns itself if passed a positive precision and the half option" do
+      35.round(1, half: :up).should      eql(35)
+      35.round(1, half: :down).should    eql(35)
+      35.round(1, half: :even).should    eql(35)
+    end
+  end
 end