1 files changed, 14 insertions, 0 deletions
diff --git a/spec/ruby/library/date/prev_day_spec.rb b/spec/ruby/library/date/prev_day_spec.rb
new file mode 100644
index 0000000000..cce24da875
--- /dev/null
+++ b/spec/ruby/library/date/prev_day_spec.rb
@@ -0,0 +1,14 @@
+require_relative '../../spec_helper'
+require 'date'
+
+describe "Date#prev_day" do
+  it "returns previous day" do
+    d = Date.new(2000, 7, 2).prev_day
+    d.should == Date.new(2000, 7, 1)
+  end
+
+  it "returns three days ago across months" do
+    d = Date.new(2000, 7, 2).prev_day(3)
+    d.should == Date.new(2000, 6, 29)
+  end
+end