1 files changed, 14 insertions, 0 deletions
diff --git a/spec/ruby/core/time/at_spec.rb b/spec/ruby/core/time/at_spec.rb
index 4ff38bbd21..ff43537dcc 100644
--- a/spec/ruby/core/time/at_spec.rb
+++ b/spec/ruby/core/time/at_spec.rb
@@ -38,6 +38,20 @@ describe "Time.at" do
         Time.at(BigDecimal('1.1')).to_f.should == 1.1
       end
     end
+
+    describe "passed Rational" do
+      it "returns Time with correct microseconds" do
+        t = Time.at(Rational(1_486_570_508_539_759, 1_000_000))
+        t.usec.should == 539_759
+        t.nsec.should == 539_759_000
+      end
+
+      it "returns Time with correct nanoseconds" do
+        t = Time.at(Rational(1_486_570_508_539_759_123, 1_000_000_000))
+        t.usec.should == 539_759
+        t.nsec.should == 539_759_123
+      end
+    end
   end
 
   describe "passed Time" do