2 files changed, 19 insertions, 1 deletions
diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index fa716787fe..6846f7958b 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -157,7 +157,7 @@ class TestISeq < Test::Unit::TestCase
 
   def test_ractor_unshareable_outer_variable
     name = "\u{2603 26a1}"
-    assert_raise_with_message(ArgumentError, /\(#{name}\)/) do
+    assert_raise_with_message(Ractor::IsolationError, /\(#{name}\)/) do
       eval("#{name} = nil; Ractor.shareable_proc{#{name} = nil}")
     end
 
diff --git a/test/ruby/test_ractor.rb b/test/ruby/test_ractor.rb
index 6ae511217a..36467a3591 100644
--- a/test/ruby/test_ractor.rb
+++ b/test/ruby/test_ractor.rb
@@ -213,6 +213,24 @@ class TestRactor < Test::Unit::TestCase
     assert_unshareable(pr, /not supported yet/, exception: RuntimeError)
   end
 
+  def test_ractor_new_raises_isolation_error_if_outer_variables_are_accessed
+    assert_raise(Ractor::IsolationError) do
+      channel = Ractor::Port.new
+      Ractor.new(channel) do
+        inbound_work = Ractor::Port.new
+        channel << inbound_work
+      end
+    end
+  end
+
+  def test_ractor_new_raises_isolation_error_if_proc_uses_yield
+    assert_raise(Ractor::IsolationError) do
+      Ractor.new do
+        yield
+      end
+    end
+  end
+
   def assert_make_shareable(obj)
     refute Ractor.shareable?(obj), "object was already shareable"
     Ractor.make_shareable(obj)