Add CBOR Time tests.

spec/cbor_time.cr

@@ -0,0 +1,15 @@
+require "./spec_helper"
+
+describe CBOR do
+  describe "Time" do
+    it "Time#to_cbor" do
+      time = Time.utc(2016, 2, 15, 10, 20, 30)
+      time.to_cbor.hexstring.should eq "c074323031362d30322d31355431303a32303a33305a"
+    end
+
+    it "Time#from_cbor" do
+      time = Time.from_cbor Time.utc(2016, 2, 15, 10, 20, 30).to_cbor
+      time.to_cbor.hexstring.should eq "c074323031362d30322d31355431303a32303a33305a"
+    end
+  end
+end