1 files changed, 51 insertions, 0 deletions
diff --git a/spec/ruby/core/time/now_spec.rb b/spec/ruby/core/time/now_spec.rb
index 7dc7951996..d47f00723e 100644
--- a/spec/ruby/core/time/now_spec.rb
+++ b/spec/ruby/core/time/now_spec.rb
@@ -3,4 +3,55 @@ require_relative 'shared/now'
 
 describe "Time.now" do
   it_behaves_like :time_now, :now
+
+  ruby_version_is '3.1' do # https://bugs.ruby-lang.org/issues/17485
+    describe ":in keyword argument" do
+      it "could be UTC offset as a String in '+HH:MM or '-HH:MM' format" do
+        time = Time.now(in: "+05:00")
+
+        time.utc_offset.should == 5*60*60
+        time.zone.should == nil
+
+        time = Time.now(in: "-09:00")
+
+        time.utc_offset.should == -9*60*60
+        time.zone.should == nil
+      end
+
+      it "could be UTC offset as a number of seconds" do
+        time = Time.now(in: 5*60*60)
+
+        time.utc_offset.should == 5*60*60
+        time.zone.should == nil
+
+        time = Time.now(in: -9*60*60)
+
+        time.utc_offset.should == -9*60*60
+        time.zone.should == nil
+      end
+
+      it "returns a Time with UTC offset specified as a single letter military timezone" do
+        Time.now(in: "W").utc_offset.should == 3600 * -10
+      end
+
+      it "could be a timezone object" do
+        zone = TimeSpecs::TimezoneWithName.new(name: "Asia/Colombo")
+        time = Time.now(in: zone)
+
+        time.utc_offset.should == 5*3600+30*60
+        time.zone.should == zone
+
+        zone = TimeSpecs::TimezoneWithName.new(name: "PST")
+        time = Time.now(in: zone)
+
+        time.utc_offset.should == -9*60*60
+        time.zone.should == zone
+      end
+
+      it "raises ArgumentError if format is invalid" do
+        -> { Time.now(in: "+09:99") }.should raise_error(ArgumentError)
+        -> { Time.now(in: "ABC") }.should raise_error(ArgumentError)
+      end
+    end
+  end
 end