1 files changed, 30 insertions, 0 deletions
diff --git a/spec/ruby/library/date/minus_spec.rb b/spec/ruby/library/date/minus_spec.rb
new file mode 100644
index 0000000000..09da595872
--- /dev/null
+++ b/spec/ruby/library/date/minus_spec.rb
@@ -0,0 +1,30 @@
+require 'date'
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Date#-" do
+
+  it "substracts a number of days from a Date" do
+    d = Date.civil(2007, 5 ,2) - 13
+    d.should == Date.civil(2007, 4, 19)
+  end
+
+  it "substracts a negative number of days from a Date" do
+    d = Date.civil(2007, 4, 19).-(-13)
+    d.should == Date.civil(2007, 5 ,2)
+  end
+
+  it "computes the difference between two dates" do
+    (Date.civil(2007,2,27) - Date.civil(2007,2,27)).should == 0
+    (Date.civil(2007,2,27) - Date.civil(2007,2,26)).should == 1
+    (Date.civil(2006,2,27) - Date.civil(2007,2,27)).should == -365
+    (Date.civil(2008,2,27) - Date.civil(2007,2,27)).should == 365
+
+  end
+
+  it "raises an error for non Numeric arguments" do
+    lambda { Date.civil(2007,2,27) - :hello }.should raise_error(TypeError)
+    lambda { Date.civil(2007,2,27) - "hello" }.should raise_error(TypeError)
+    lambda { Date.civil(2007,2,27) - Object.new }.should raise_error(TypeError)
+  end
+
+end