1 files changed, 15 insertions, 0 deletions
diff --git a/spec/ruby/library/date/next_month_spec.rb b/spec/ruby/library/date/next_month_spec.rb
index 22699a39a5..9becd7e37f 100644
--- a/spec/ruby/library/date/next_month_spec.rb
+++ b/spec/ruby/library/date/next_month_spec.rb
@@ -11,4 +11,19 @@ describe "Date#next_month" do
     d = Date.new(2000, 7, 1).next_month(3)
     d.should == Date.new(2000, 10, 1)
   end
+
+  it "returns three months later across years" do
+    d = Date.new(2000, 12, 1).next_month(3)
+    d.should == Date.new(2001, 3, 1)
+  end
+
+  it "returns last day of month two months later" do
+    d = Date.new(2000, 1, 31).next_month(2)
+    d.should == Date.new(2000, 3, 31)
+  end
+
+  it "returns last day of next month when same day does not exist" do
+    d = Date.new(2001, 1, 30).next_month
+    d.should == Date.new(2001, 2, 28)
+  end
 end