Add additional Ractor.make_shareable tests

Merged: https://github.com/ruby/ruby/pull/12977

test/ruby/test_ractor.rb

@@ -0,0 +1,76 @@
+# frozen_string_literal: false
+require 'test/unit'
+
+class TestRactor < Test::Unit::TestCase
+  def test_shareability_of_iseq_proc
+    y = nil.instance_eval do
+      foo = []
+      proc { foo }
+    end
+    assert_unshareable(y, /unshareable object \[\] from variable 'foo'/)
+
+    y = [].instance_eval { proc { self } }
+    assert_unshareable(y, /Proc's self is not shareable/)
+
+    y = [].freeze.instance_eval { proc { self } }
+    assert_make_shareable(y)
+  end
+
+  def test_shareability_of_curried_proc
+    x = nil.instance_eval do
+      foo = []
+      proc { foo }.curry
+    end
+    assert_unshareable(x, /unshareable object \[\] from variable 'foo'/)
+
+    x = nil.instance_eval do
+      foo = 123
+      proc { foo }.curry
+    end
+    assert_make_shareable(x)
+  end
+
+  def test_shareability_of_method_proc
+    str = +""
+
+    x = str.instance_exec { proc { to_s } }
+    assert_unshareable(x, /Proc's self is not shareable/)
+
+    x = str.instance_exec { method(:to_s) }
+    assert_unshareable(x, "can not make shareable object for #<Method: String#to_s()>", exception: Ractor::Error)
+
+    x = str.instance_exec { method(:to_s).to_proc }
+    assert_unshareable(x, "can not make shareable object for #<Method: String#to_s()>", exception: Ractor::Error)
+
+    x = str.instance_exec { method(:itself).to_proc }
+    assert_unshareable(x, "can not make shareable object for #<Method: String(Kernel)#itself()>", exception: Ractor::Error)
+
+    str.freeze
+
+    x = str.instance_exec { proc { to_s } }
+    assert_make_shareable(x)
+
+    x = str.instance_exec { method(:to_s) }
+    assert_unshareable(x, "can not make shareable object for #<Method: String#to_s()>", exception: Ractor::Error)
+
+    x = str.instance_exec { method(:to_s).to_proc }
+    assert_unshareable(x, "can not make shareable object for #<Method: String#to_s()>", exception: Ractor::Error)
+
+    x = str.instance_exec { method(:itself).to_proc }
+    assert_unshareable(x, "can not make shareable object for #<Method: String(Kernel)#itself()>", exception: Ractor::Error)
+  end
+
+  def assert_make_shareable(obj)
+    refute Ractor.shareable?(obj), "object was already shareable"
+    Ractor.make_shareable(obj)
+    assert Ractor.shareable?(obj), "object didn't become shareable"
+  end
+
+  def assert_unshareable(obj, msg=nil, exception: Ractor::IsolationError)
+    refute Ractor.shareable?(obj), "object is already shareable"
+    assert_raise_with_message(exception, msg) do
+      Ractor.make_shareable(obj)
+    end
+    refute Ractor.shareable?(obj), "despite raising, object became shareable"
+  end
+end