1 files changed, 22 insertions, 0 deletions
diff --git a/spec/ruby/library/date/jd_spec.rb b/spec/ruby/library/date/jd_spec.rb
new file mode 100644
index 0000000000..e5cfe10eff
--- /dev/null
+++ b/spec/ruby/library/date/jd_spec.rb
@@ -0,0 +1,22 @@
+require_relative '../../spec_helper'
+require 'date'
+
+describe "Date#jd" do
+  it "determines the Julian day for a Date object" do
+    Date.civil(2008, 1, 16).jd.should == 2454482
+  end
+end
+
+describe "Date.jd" do
+  it "constructs a Date object if passed a Julian day" do
+    Date.jd(2454482).should == Date.civil(2008, 1, 16)
+  end
+
+  it "returns a Date object representing Julian day 0 (-4712-01-01) if no arguments passed" do
+    Date.jd.should == Date.civil(-4712, 1, 1)
+  end
+
+  it "constructs a Date object if passed a negative number" do
+    Date.jd(-1).should == Date.civil(-4713, 12, 31)
+  end
+end