1 files changed, 15 insertions, 0 deletions
diff --git a/spec/ruby/library/date/prev_month_spec.rb b/spec/ruby/library/date/prev_month_spec.rb
index eaf7f67ee0..440c17ffc9 100644
--- a/spec/ruby/library/date/prev_month_spec.rb
+++ b/spec/ruby/library/date/prev_month_spec.rb
@@ -11,4 +11,19 @@ describe "Date#prev_month" do
     d = Date.new(2000, 10, 1).prev_month(3)
     d.should == Date.new(2000, 7, 1)
   end
+
+  it "returns three months ago across years" do
+    d = Date.new(2000, 1, 1).prev_month(3)
+    d.should == Date.new(1999, 10, 1)
+  end
+
+  it "returns last day of month two months ago" do
+    d = Date.new(2000, 3, 31).prev_month(2)
+    d.should == Date.new(2000, 1, 31)
+  end
+
+  it "returns last day of previous month when same day does not exist" do
+    d = Date.new(2001, 3, 30).prev_month
+    d.should == Date.new(2001, 2, 28)
+  end
 end