lstrip returns String instances when called on a subclass in Ruby 3.0.0

ruby · Oct 1, 2021 · 1faf27d · 1faf27d
1 parent 1307612
commit 1faf27d
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/core/string/lstrip_spec.rb b/core/string/lstrip_spec.rb
@@ -16,6 +16,22 @@
     end
   end
 
+  ruby_version_is '3.0' do
+    it "returns String instances when called on a subclass" do
+      StringSpecs::MyString.new(" hello").lstrip.should be_an_instance_of(String)
+      StringSpecs::MyString.new(" ").lstrip.should be_an_instance_of(String)
+      StringSpecs::MyString.new("").lstrip.should be_an_instance_of(String)
+    end
+  end
+
+  ruby_version_is ''...'3.0.0' do
+    it "returns subclass instances when called on a subclass" do
+      StringSpecs::MyString.new(" hello").lstrip.should be_an_instance_of(StringSpecs::MyString)
+      StringSpecs::MyString.new(" ").lstrip.should be_an_instance_of(StringSpecs::MyString)
+      StringSpecs::MyString.new("").lstrip.should be_an_instance_of(StringSpecs::MyString)
+    end
+  end
+
   ruby_version_is ''...'2.7' do
     it "taints the result when self is tainted" do
       "".taint.lstrip.should.tainted?