fix: restrict response data input types

Author: kholdrex

lib/irt_ruby/response_data_validator.rb

@@ -6,7 +6,7 @@ module ResponseDataValidator
     module_function
 
     def validate!(data)
-      raise ArgumentError, "response data must be a Matrix or array of arrays" unless data.respond_to?(:to_a)
+      raise ArgumentError, "response data must be a Matrix or array of arrays" unless valid_data_container?(data)
 
       data_array = data.to_a
 
@@ -49,5 +49,9 @@ def validate_values!(data_array)
     def valid_response?(value)
       value.nil? || value.eql?(0) || value.eql?(1)
     end
+
+    def valid_data_container?(data)
+      data.is_a?(Array) || (defined?(::Matrix) && data.is_a?(::Matrix))
+    end
   end
 end

spec/spec_helper.rb

@@ -27,6 +27,10 @@
   it "rejects non-numeric truthy, falsey, and string responses" do
     expect { described_class.new([[1, "1"], [false, nil]]) }.to raise_error(ArgumentError, /invalid value/)
   end
+
+  it "rejects hash input even when it can be converted to an array" do
+    expect { described_class.new({ [0] => 1 }) }.to raise_error(ArgumentError, /Matrix or array of arrays/)
+  end
 end
 
 RSpec.configure do |config|