3 files changed, 18 insertions, 4 deletions
diff --git a/spec/rubyspec/library/date/next_day_spec.rb b/spec/rubyspec/library/date/next_day_spec.rb
new file mode 100644
index 0000000000..1ccb4df257
--- /dev/null
+++ b/spec/rubyspec/library/date/next_day_spec.rb
@@ -0,0 +1,10 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'date'
+
+describe "Date#next_day" do
+  it "returns the next day" do
+    d = Date.new(2000, 1, 5)
+    d1 = Date.new(2000, 1, 4).next_day
+    d1.should == d
+  end
+end
diff --git a/spec/rubyspec/library/set/case_equality_spec.rb b/spec/rubyspec/library/set/case_equality_spec.rb
index ca1e900557..f256324d49 100644
--- a/spec/rubyspec/library/set/case_equality_spec.rb
+++ b/spec/rubyspec/library/set/case_equality_spec.rb
@@ -2,6 +2,8 @@ require File.expand_path('../../../spec_helper', __FILE__)
 require File.expand_path('../shared/include', __FILE__)
 require 'set'
 
-describe "Set#===" do
-  it_behaves_like :set_include, :===
+ruby_version_is "2.5" do
+  describe "Set#===" do
+    it_behaves_like :set_include, :===
+  end
 end
diff --git a/spec/rubyspec/library/set/sortedset/case_equality_spec.rb b/spec/rubyspec/library/set/sortedset/case_equality_spec.rb
index f5ff2c91fe..cea52dedbd 100644
--- a/spec/rubyspec/library/set/sortedset/case_equality_spec.rb
+++ b/spec/rubyspec/library/set/sortedset/case_equality_spec.rb
@@ -2,6 +2,8 @@ require File.expand_path('../../../../spec_helper', __FILE__)
 require File.expand_path('../shared/include', __FILE__)
 require 'set'
 
-describe "SortedSet#===" do
-  it_behaves_like :sorted_set_include, :===
+ruby_version_is "2.5" do
+  describe "SortedSet#===" do
+    it_behaves_like :sorted_set_include, :===
+  end
 end