2 files changed, 27 insertions, 3 deletions
diff --git a/spec/ruby/library/timeout/error_spec.rb b/spec/ruby/library/timeout/error_spec.rb
index 6c236e5128..2c28236e29 100644
--- a/spec/ruby/library/timeout/error_spec.rb
+++ b/spec/ruby/library/timeout/error_spec.rb
@@ -3,6 +3,6 @@ require 'timeout'
 
 describe "Timeout::Error" do
   it "is a subclass of RuntimeError" do
-    RuntimeError.should be_ancestor_of(Timeout::Error)
+    Timeout::Error.ancestors.should.include?(RuntimeError)
   end
 end
diff --git a/spec/ruby/library/timeout/timeout_spec.rb b/spec/ruby/library/timeout/timeout_spec.rb
index a9a60fdeb9..9ae70bf600 100644
--- a/spec/ruby/library/timeout/timeout_spec.rb
+++ b/spec/ruby/library/timeout/timeout_spec.rb
@@ -7,7 +7,7 @@ describe "Timeout.timeout" do
       Timeout.timeout(1) do
         sleep
       end
-    }.should raise_error(Timeout::Error)
+    }.should.raise(Timeout::Error)
   end
 
   it "raises specified error type when it times out" do
@@ -15,7 +15,23 @@ describe "Timeout.timeout" do
       Timeout.timeout(1, StandardError) do
         sleep
       end
-    end.should raise_error(StandardError)
+    end.should.raise(StandardError)
+  end
+
+  it "raises specified error type with specified message when it times out" do
+    -> do
+      Timeout.timeout(1, StandardError, "foobar") do
+        sleep
+      end
+    end.should.raise(StandardError, "foobar")
+  end
+
+  it "raises specified error type with a default message when it times out if message is nil" do
+    -> do
+      Timeout.timeout(1, StandardError, nil) do
+        sleep
+      end
+    end.should.raise(StandardError, "execution expired")
   end
 
   it "returns back the last value in the block" do
@@ -23,4 +39,12 @@ describe "Timeout.timeout" do
       42
     end.should == 42
   end
+
+  ruby_version_is "3.4" do
+    it "raises an ArgumentError when provided with a negative duration" do
+      -> {
+        Timeout.timeout(-1)
+      }.should.raise(ArgumentError, "Timeout sec must be a non-negative number")
+    end
+  end
 end