1 files changed, 111 insertions, 0 deletions
diff --git a/spec/ruby/core/time/zone_spec.rb b/spec/ruby/core/time/zone_spec.rb
new file mode 100644
index 0000000000..2cb3c5e7bb
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+++ b/spec/ruby/core/time/zone_spec.rb
@@ -0,0 +1,111 @@
+require_relative '../../spec_helper'
+
+describe "Time#zone" do
+  platform_is_not :windows do
+    it "returns the time zone used for time" do
+      with_timezone("America/New_York") do
+        Time.new(2001, 1, 1, 0, 0, 0).zone.should == "EST"
+        Time.new(2001, 7, 1, 0, 0, 0).zone.should == "EDT"
+        %w[EST EDT].should.include? Time.now.zone
+      end
+    end
+  end
+
+  it "returns nil for a Time with a fixed offset" do
+    Time.new(2001, 1, 1, 0, 0, 0, "+05:00").zone.should == nil
+  end
+
+  platform_is_not :windows do
+    it "returns the correct timezone for a local time" do
+      t = Time.new(2005, 2, 27, 22, 50, 0, -3600)
+
+      with_timezone("America/New_York") do
+        t.getlocal.zone.should == "EST"
+      end
+    end
+  end
+
+  it "returns nil when getting the local time with a fixed offset" do
+    t = Time.new(2005, 2, 27, 22, 50, 0, -3600)
+
+    with_timezone("America/New_York") do
+      t.getlocal("+05:00").zone.should == nil
+    end
+  end
+
+  describe "Encoding.default_internal is set" do
+    before :each do
+      @encoding = Encoding.default_internal
+      Encoding.default_internal = Encoding::UTF_8
+    end
+
+    after :each do
+      Encoding.default_internal = @encoding
+    end
+
+    it "returns an ASCII string" do
+      t = Time.new(2005, 2, 27, 22, 50, 0, -3600)
+
+      with_timezone("America/New_York") do
+        t.getlocal.zone.encoding.should == Encoding::US_ASCII
+      end
+    end
+
+    it "doesn't raise errors for a Time with a fixed offset" do
+      Time.new(2001, 1, 1, 0, 0, 0, "+05:00").zone.should == nil
+    end
+  end
+
+  it "returns UTC when called on a UTC time" do
+    Time.now.utc.zone.should == "UTC"
+    Time.now.gmtime.zone.should == "UTC"
+    Time.now.getgm.zone.should == "UTC"
+    Time.now.getutc.zone.should == "UTC"
+    Time.utc(2022).zone.should == "UTC"
+    Time.new(2022, 1, 1, 0, 0, 0, "UTC").zone.should == "UTC"
+    Time.new(2022, 1, 1, 0, 0, 0, "Z").zone.should == "UTC"
+    Time.now.localtime("UTC").zone.should == "UTC"
+    Time.now.localtime("Z").zone.should == "UTC"
+    Time.at(Time.now, in: 'UTC').zone.should == "UTC"
+    Time.at(Time.now, in: 'Z').zone.should == "UTC"
+
+    Time.new(2022, 1, 1, 0, 0, 0, "-00:00").zone.should == "UTC"
+    Time.now.localtime("-00:00").zone.should == "UTC"
+    Time.at(Time.now, in: '-00:00').zone.should == "UTC"
+
+    Time.new(2022, 1, 1, 0, 0, 0, in: "UTC").zone.should == "UTC"
+    Time.new(2022, 1, 1, 0, 0, 0, in: "Z").zone.should == "UTC"
+
+    Time.now(in: 'UTC').zone.should == "UTC"
+    Time.now(in: 'Z').zone.should == "UTC"
+
+    Time.at(Time.now, in: 'UTC').zone.should == "UTC"
+    Time.at(Time.now, in: 'Z').zone.should == "UTC"
+  end
+
+  platform_is_not :aix, :windows do
+    it "defaults to UTC when bad zones given" do
+      with_timezone("hello-foo") do
+        Time.now.utc_offset.should == 0
+      end
+      with_timezone("1,2") do
+        Time.now.utc_offset.should == 0
+      end
+      with_timezone("Sun,Fri,2") do
+        Time.now.utc_offset.should == 0
+      end
+    end
+  end
+
+  platform_is :windows do
+    # See https://bugs.ruby-lang.org/issues/13591#note-11
+    it "defaults to UTC when bad zones given" do
+      with_timezone("1,2") do
+        Time.now.utc_offset.should == 0
+      end
+      with_timezone("12") do
+        Time.now.utc_offset.should == 0
+      end
+    end
+  end
+end