1 files changed, 22 insertions, 8 deletions
diff --git a/spec/ruby/core/time/at_spec.rb b/spec/ruby/core/time/at_spec.rb
index 2cc46ab8c9..48fb3c6f52 100644
--- a/spec/ruby/core/time/at_spec.rb
+++ b/spec/ruby/core/time/at_spec.rb
@@ -32,13 +32,6 @@ describe "Time.at" do
       t2.nsec.should == t.nsec
     end
 
-    describe "passed BigDecimal" do
-      it "doesn't round input value" do
-        require 'bigdecimal'
-        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))
@@ -203,7 +196,7 @@ describe "Time.at" do
       end
 
       it "does not try to convert format to Symbol with #to_sym" do
-        format = "usec"
+        format = +"usec"
         format.should_not_receive(:to_sym)
         -> { Time.at(0, 123456, format) }.should raise_error(ArgumentError)
       end
@@ -251,6 +244,22 @@ describe "Time.at" do
       time.to_i.should == @epoch_time
     end
 
+    it "could be UTC offset as a 'UTC' String" do
+      time = Time.at(@epoch_time, in: "UTC")
+
+      time.utc_offset.should == 0
+      time.zone.should == "UTC"
+      time.to_i.should == @epoch_time
+    end
+
+    it "could be UTC offset as a military zone A-Z" do
+      time = Time.at(@epoch_time, in: "B")
+
+      time.utc_offset.should == 3600 * 2
+      time.zone.should == nil
+      time.to_i.should == @epoch_time
+    end
+
     it "could be a timezone object" do
       zone = TimeSpecs::TimezoneWithName.new(name: "Asia/Colombo")
       time = Time.at(@epoch_time, in: zone)
@@ -266,5 +275,10 @@ describe "Time.at" do
       time.zone.should == zone
       time.to_i.should == @epoch_time
     end
+
+    it "raises ArgumentError if format is invalid" do
+      -> { Time.at(@epoch_time, in: "+09:99") }.should raise_error(ArgumentError)
+      -> { Time.at(@epoch_time, in: "ABC") }.should raise_error(ArgumentError)
+    end
   end
 end