1 files changed, 31 insertions, 25 deletions
diff --git a/spec/ruby/core/kernel/freeze_spec.rb b/spec/ruby/core/kernel/freeze_spec.rb
index 018784a4f5..079617dce4 100644
--- a/spec/ruby/core/kernel/freeze_spec.rb
+++ b/spec/ruby/core/kernel/freeze_spec.rb
@@ -4,46 +4,46 @@ require_relative 'fixtures/classes'
 describe "Kernel#freeze" do
   it "prevents self from being further modified" do
     o = mock('o')
-    o.frozen?.should be_false
+    o.frozen?.should == false
     o.freeze
-    o.frozen?.should be_true
+    o.frozen?.should == true
   end
 
   it "returns self" do
     o = Object.new
-    o.freeze.should equal(o)
+    o.freeze.should.equal?(o)
   end
 
   describe "on integers" do
     it "has no effect since they are already frozen" do
-      1.frozen?.should be_true
+      1.frozen?.should == true
       1.freeze
 
       bignum = bignum_value
-      bignum.frozen?.should be_true
+      bignum.frozen?.should == true
       bignum.freeze
     end
   end
 
   describe "on a Float" do
     it "has no effect since it is already frozen" do
-      1.2.frozen?.should be_true
+      1.2.frozen?.should == true
       1.2.freeze
     end
   end
 
   describe "on a Symbol" do
     it "has no effect since it is already frozen" do
-      :sym.frozen?.should be_true
+      :sym.frozen?.should == true
       :sym.freeze
     end
   end
 
   describe "on true, false and nil" do
     it "has no effect since they are already frozen" do
-      nil.frozen?.should be_true
-      true.frozen?.should be_true
-      false.frozen?.should be_true
+      nil.frozen?.should == true
+      true.frozen?.should == true
+      false.frozen?.should == true
 
       nil.freeze
       true.freeze
@@ -51,21 +51,19 @@ describe "Kernel#freeze" do
     end
   end
 
-  ruby_version_is "2.5" do
-    describe "on a Complex" do
-      it "has no effect since it is already frozen" do
-        c = Complex(1.3, 3.1)
-        c.frozen?.should be_true
-        c.freeze
-      end
+  describe "on a Complex" do
+    it "has no effect since it is already frozen" do
+      c = Complex(1.3, 3.1)
+      c.frozen?.should == true
+      c.freeze
     end
+  end
 
-    describe "on a Rational" do
-      it "has no effect since it is already frozen" do
-        r = Rational(1, 3)
-        r.frozen?.should be_true
-        r.freeze
-      end
+  describe "on a Rational" do
+    it "has no effect since it is already frozen" do
+      r = Rational(1, 3)
+      r.frozen?.should == true
+      r.freeze
     end
   end
 
@@ -74,12 +72,20 @@ describe "Kernel#freeze" do
       def mutate; @foo = 1; end
     end.new
     o.freeze
-    lambda {o.mutate}.should raise_error(RuntimeError)
+    -> {o.mutate}.should.raise(RuntimeError)
   end
 
   it "causes instance_variable_set to raise RuntimeError" do
     o = Object.new
     o.freeze
-    lambda {o.instance_variable_set(:@foo, 1)}.should raise_error(RuntimeError)
+    -> {o.instance_variable_set(:@foo, 1)}.should.raise(RuntimeError)
+  end
+
+  it "freezes an object's singleton class" do
+    o = Object.new
+    c = o.singleton_class
+    c.frozen?.should == false
+    o.freeze
+    c.frozen?.should == true
   end
 end