1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/string/shared/partition.rb b/spec/ruby/core/string/shared/partition.rb
new file mode 100644
index 0000000000..7dc3d9cc0b
--- /dev/null
+++ b/spec/ruby/core/string/shared/partition.rb
@@ -0,0 +1,36 @@
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+
+describe :string_partition, shared: true do
+  ruby_version_is '3.0' do
+    it "returns String instances when called on a subclass" do
+      StringSpecs::MyString.new("hello").send(@method, "l").each do |item|
+        item.should be_an_instance_of(String)
+      end
+
+      StringSpecs::MyString.new("hello").send(@method, "x").each do |item|
+        item.should be_an_instance_of(String)
+      end
+
+      StringSpecs::MyString.new("hello").send(@method, /l./).each do |item|
+        item.should be_an_instance_of(String)
+      end
+    end
+  end
+
+  ruby_version_is ''...'3.0' do
+    it "returns subclass instances when called on a subclass" do
+      StringSpecs::MyString.new("hello").send(@method, StringSpecs::MyString.new("l")).each do |item|
+        item.should be_an_instance_of(StringSpecs::MyString)
+      end
+
+      StringSpecs::MyString.new("hello").send(@method, "x").each do |item|
+        item.should be_an_instance_of(StringSpecs::MyString)
+      end
+
+      StringSpecs::MyString.new("hello").send(@method, /l./).each do |item|
+        item.should be_an_instance_of(StringSpecs::MyString)
+      end
+    end
+  end
+end