1 files changed, 29 insertions, 0 deletions
diff --git a/spec/ruby/library/date/next_month_spec.rb b/spec/ruby/library/date/next_month_spec.rb
new file mode 100644
index 0000000000..6ee664433f
--- /dev/null
+++ b/spec/ruby/library/date/next_month_spec.rb
@@ -0,0 +1,29 @@
+require_relative '../../spec_helper'
+require 'date'
+
+describe "Date#next_month" do
+  it "returns the next month" do
+    d = Date.new(2000, 7, 1).next_month
+    d.should == Date.new(2000, 8, 1)
+  end
+
+  it "returns three months later" 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