1 files changed, 40 insertions, 6 deletions
diff --git a/spec/ruby/language/string_spec.rb b/spec/ruby/language/string_spec.rb
index 418dc2ca7d..ce4941569e 100644
--- a/spec/ruby/language/string_spec.rb
+++ b/spec/ruby/language/string_spec.rb
@@ -56,6 +56,28 @@ describe "Ruby character strings" do
     "#\$".should == '#$'
   end
 
+  ruby_version_is ''...'2.7' do
+    it "taints the result of interpolation when an interpolated value is tainted" do
+      "#{"".taint}".tainted?.should be_true
+
+      @ip.taint
+      "#@ip".tainted?.should be_true
+
+      $ip.taint
+      "#$ip".tainted?.should be_true
+    end
+
+    it "untrusts the result of interpolation when an interpolated value is untrusted" do
+      "#{"".untrust}".untrusted?.should be_true
+
+      @ip.untrust
+      "#@ip".untrusted?.should be_true
+
+      $ip.untrust
+      "#$ip".untrusted?.should be_true
+    end
+  end
+
   it "allows using non-alnum characters as string delimiters" do
     %(hey #{@ip}).should == "hey xxx"
     %[hey #{@ip}].should == "hey xxx"
@@ -277,11 +299,23 @@ describe "Ruby String interpolation" do
     eval(code).should_not.frozen?
   end
 
-  it "creates a non-frozen String when # frozen-string-literal: true is used" do
-    code = <<~'RUBY'
-    # frozen-string-literal: true
-    "a#{6*7}c"
-    RUBY
-    eval(code).should_not.frozen?
+  ruby_version_is "3.0" do
+    it "creates a non-frozen String when # frozen-string-literal: true is used" do
+      code = <<~'RUBY'
+      # frozen-string-literal: true
+      "a#{6*7}c"
+      RUBY
+      eval(code).should_not.frozen?
+    end
+  end
+
+  ruby_version_is ""..."3.0" do
+    it "creates a frozen String when # frozen-string-literal: true is used" do
+      code = <<~'RUBY'
+      # frozen-string-literal: true
+      "a#{6*7}c"
+      RUBY
+      eval(code).should.frozen?
+    end
   end
 end