Check builtin constant Strings to be frozen

Author: herwinw

core/builtin_constants/builtin_constants_spec.rb

@@ -4,6 +4,10 @@
   it "is a String" do
     RUBY_VERSION.should be_kind_of(String)
   end
+
+  it "is frozen" do
+    RUBY_VERSION.should.frozen?
+  end
 end
 
 describe "RUBY_PATCHLEVEL" do
@@ -16,34 +20,58 @@
   it "is a String" do
     RUBY_COPYRIGHT.should be_kind_of(String)
   end
+
+  it "is frozen" do
+    RUBY_COPYRIGHT.should.frozen?
+  end
 end
 
 describe "RUBY_DESCRIPTION" do
   it "is a String" do
     RUBY_DESCRIPTION.should be_kind_of(String)
   end
+
+  it "is frozen" do
+    RUBY_DESCRIPTION.should.frozen?
+  end
 end
 
 describe "RUBY_ENGINE" do
   it "is a String" do
     RUBY_ENGINE.should be_kind_of(String)
   end
+
+  it "is frozen" do
+    RUBY_ENGINE.should.frozen?
+  end
 end
 
 describe "RUBY_PLATFORM" do
   it "is a String" do
     RUBY_PLATFORM.should be_kind_of(String)
   end
+
+  it "is frozen" do
+    RUBY_PLATFORM.should.frozen?
+  end
 end
 
 describe "RUBY_RELEASE_DATE" do
   it "is a String" do
     RUBY_RELEASE_DATE.should be_kind_of(String)
   end
+
+  it "is frozen" do
+    RUBY_RELEASE_DATE.should.frozen?
+  end
 end
 
 describe "RUBY_REVISION" do
   it "is a String" do
     RUBY_REVISION.should be_kind_of(String)
   end
+
+  it "is frozen" do
+    RUBY_REVISION.should.frozen?
+  end
 end