raise ArgumentError on unknown directive Array pack/ String unpack

Author: Th3-M4jor

core/array/pack/shared/basic.rb

@@ -57,9 +57,9 @@
     # NOTE: Added this case just to not forget about the decision in the ticket
     it "raise ArgumentError when a directive is unknown" do
       # additional directive ('a') is required for the X directive
-      -> { [@obj, @obj].pack("a R" + pack_format) }.should raise_error(ArgumentError)
-      -> { [@obj, @obj].pack("a 0" + pack_format) }.should raise_error(ArgumentError)
-      -> { [@obj, @obj].pack("a :" + pack_format) }.should raise_error(ArgumentError)
+      -> { [@obj, @obj].pack("a R" + pack_format) }.should raise_error(ArgumentError, /unknown pack directive 'R'/)
+      -> { [@obj, @obj].pack("a 0" + pack_format) }.should raise_error(ArgumentError, /unknown pack directive '0'/)
+      -> { [@obj, @obj].pack("a :" + pack_format) }.should raise_error(ArgumentError, /unknown pack directive ':'/)
     end
   end
 

core/string/unpack/shared/basic.rb

@@ -8,6 +8,15 @@
     d.should_receive(:to_str).and_return("a"+unpack_format)
     "abc".unpack(d).should be_an_instance_of(Array)
   end
+
+  ruby_version_is "3.3" do
+    # https://bugs.ruby-lang.org/issues/19150
+    it 'raise ArgumentError when a directive is unknown' do
+      -> { "abcdefgh".unpack("a R" + unpack_format) }.should raise_error(ArgumentError, /unknown unpack directive 'R'/)
+      -> { "abcdefgh".unpack("a 0" + unpack_format) }.should raise_error(ArgumentError, /unknown unpack directive '0'/)
+      -> { "abcdefgh".unpack("a :" + unpack_format) }.should raise_error(ArgumentError, /unknown unpack directive ':'/)
+    end
+  end
 end
 
 describe :string_unpack_no_platform, shared: true do