Guard ruby/spec with spec/mspec/tool/wrap_with_guard.rb

Merged: https://github.com/ruby/ruby/pull/4530

spec/ruby/library/matrix/hash_spec.rb

@@ -1,15 +1,18 @@
 require_relative '../../spec_helper'
-require 'matrix'
 
-describe "Matrix#hash" do
+ruby_version_is ""..."3.1" do
+  require 'matrix'
+
+  describe "Matrix#hash" do
+
+    it "returns an Integer" do
+      Matrix[ [1,2] ].hash.should be_an_instance_of(Integer)
+    end
+
+    it "returns the same value for the same matrix" do
+      data = [ [40,5], [2,7] ]
+      Matrix[ *data ].hash.should == Matrix[ *data ].hash
+    end
 
-  it "returns an Integer" do
-    Matrix[ [1,2] ].hash.should be_an_instance_of(Integer)
   end
-
-  it "returns the same value for the same matrix" do
-    data = [ [40,5], [2,7] ]
-    Matrix[ *data ].hash.should == Matrix[ *data ].hash
-  end
-
 end