9 files changed, 51 insertions, 10 deletions
diff --git a/spec/ruby/core/true/and_spec.rb b/spec/ruby/core/true/and_spec.rb
index b81b6b36b6..99e69d3ae0 100644
--- a/spec/ruby/core/true/and_spec.rb
+++ b/spec/ruby/core/true/and_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "TrueClass#&" do
   it "returns false if other is nil or false, otherwise true" do
diff --git a/spec/ruby/core/true/case_compare_spec.rb b/spec/ruby/core/true/case_compare_spec.rb
new file mode 100644
index 0000000000..dee6dd0227
--- /dev/null
+++ b/spec/ruby/core/true/case_compare_spec.rb
@@ -0,0 +1,13 @@
+require_relative '../../spec_helper'
+
+describe "TrueClass#===" do
+  it "returns true for true" do
+    (true === true).should == true
+  end
+
+  it "returns false for non-true object" do
+    (true === 1).should == false
+    (true === "").should == false
+    (true === Object).should == false
+  end
+end
diff --git a/spec/ruby/core/true/dup_spec.rb b/spec/ruby/core/true/dup_spec.rb
new file mode 100644
index 0000000000..2628f6d374
--- /dev/null
+++ b/spec/ruby/core/true/dup_spec.rb
@@ -0,0 +1,7 @@
+require_relative '../../spec_helper'
+
+describe "TrueClass#dup" do
+  it "returns self" do
+    true.dup.should.equal?(true)
+  end
+end
diff --git a/spec/ruby/core/true/inspect_spec.rb b/spec/ruby/core/true/inspect_spec.rb
index baf26123c8..09d1914856 100644
--- a/spec/ruby/core/true/inspect_spec.rb
+++ b/spec/ruby/core/true/inspect_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "TrueClass#inspect" do
   it "returns the string 'true'" do
diff --git a/spec/ruby/core/true/or_spec.rb b/spec/ruby/core/true/or_spec.rb
index a104551ae8..9bf76a62b8 100644
--- a/spec/ruby/core/true/or_spec.rb
+++ b/spec/ruby/core/true/or_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "TrueClass#|" do
   it "returns true" do
diff --git a/spec/ruby/core/true/singleton_method_spec.rb b/spec/ruby/core/true/singleton_method_spec.rb
new file mode 100644
index 0000000000..58689fb6e5
--- /dev/null
+++ b/spec/ruby/core/true/singleton_method_spec.rb
@@ -0,0 +1,13 @@
+require_relative '../../spec_helper'
+
+describe "TrueClass#singleton_method" do
+  it "raises regardless of whether TrueClass defines the method" do
+    -> { true.singleton_method(:foo) }.should.raise(NameError)
+    begin
+      def (true).foo; end
+      -> { true.singleton_method(:foo) }.should.raise(NameError)
+    ensure
+      TrueClass.send(:remove_method, :foo)
+    end
+  end
+end
diff --git a/spec/ruby/core/true/to_s_spec.rb b/spec/ruby/core/true/to_s_spec.rb
index 0e2a807a95..2c6f3889e9 100644
--- a/spec/ruby/core/true/to_s_spec.rb
+++ b/spec/ruby/core/true/to_s_spec.rb
@@ -1,7 +1,15 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "TrueClass#to_s" do
   it "returns the string 'true'" do
     true.to_s.should == "true"
   end
+
+  it "returns a frozen string" do
+    true.to_s.should.frozen?
+  end
+
+  it "always returns the same string" do
+    true.to_s.should.equal?(true.to_s)
+  end
 end
diff --git a/spec/ruby/core/true/trueclass_spec.rb b/spec/ruby/core/true/trueclass_spec.rb
index 8837117d71..1c1a0ddbe2 100644
--- a/spec/ruby/core/true/trueclass_spec.rb
+++ b/spec/ruby/core/true/trueclass_spec.rb
@@ -1,15 +1,15 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "TrueClass" do
   it ".allocate raises a TypeError" do
-    lambda do
+    -> do
       TrueClass.allocate
-    end.should raise_error(TypeError)
+    end.should.raise(TypeError)
   end
 
   it ".new is undefined" do
-    lambda do
+    -> do
       TrueClass.new
-    end.should raise_error(NoMethodError)
+    end.should.raise(NoMethodError)
   end
 end
diff --git a/spec/ruby/core/true/xor_spec.rb b/spec/ruby/core/true/xor_spec.rb
index 1d0ad394da..8f5ecd5075 100644
--- a/spec/ruby/core/true/xor_spec.rb
+++ b/spec/ruby/core/true/xor_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "TrueClass#^" do
   it "returns true if other is nil or false, otherwise false" do