1 files changed, 33 insertions, 0 deletions
diff --git a/spec/ruby/core/time/shared/gmtime.rb b/spec/ruby/core/time/shared/gmtime.rb
new file mode 100644
index 0000000000..e684a1fd95
--- /dev/null
+++ b/spec/ruby/core/time/shared/gmtime.rb
@@ -0,0 +1,33 @@
+describe :time_gmtime, shared: true do
+  it "converts self to UTC, modifying the receiver" do
+    # Testing with America/Regina here because it doesn't have DST.
+    with_timezone("CST", -6) do
+      t = Time.local(2007, 1, 9, 6, 0, 0)
+      t.send(@method)
+      t.should == Time.gm(2007, 1, 9, 12, 0, 0)
+    end
+  end
+
+  it "returns self" do
+    with_timezone("CST", -6) do
+      t = Time.local(2007, 1, 9, 12, 0, 0)
+      t.send(@method).should equal(t)
+    end
+  end
+
+  describe "on a frozen time" do
+    it "does not raise an error if already in UTC" do
+      time = Time.gm(2007, 1, 9, 12, 0, 0)
+      time.freeze
+      time.send(@method).should equal(time)
+    end
+
+    it "raises a RuntimeError if the time is not UTC" do
+      with_timezone("CST", -6) do
+        time = Time.now
+        time.freeze
+        lambda { time.send(@method) }.should raise_error(RuntimeError)
+      end
+    end
+  end
+end