1 files changed, 39 insertions, 5 deletions
diff --git a/spec/ruby/core/thread/start_spec.rb b/spec/ruby/core/thread/start_spec.rb
index 932e782382..a2ee52180b 100644
--- a/spec/ruby/core/thread/start_spec.rb
+++ b/spec/ruby/core/thread/start_spec.rb
@@ -1,9 +1,43 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/start', __FILE__)
+require_relative '../../spec_helper'
 
 describe "Thread.start" do
-  describe "Thread.start" do
-    it_behaves_like :thread_start, :start
+  before :each do
+    ScratchPad.clear
+  end
+
+  it "raises an ArgumentError if not passed a block" do
+    -> {
+      Thread.start
+    }.should.raise(ArgumentError)
+  end
+
+  it "spawns a new Thread running the block" do
+    run = false
+    t = Thread.start { run = true }
+    t.should.is_a?(Thread)
+    t.join
+
+    run.should == true
+  end
+
+  it "respects Thread subclasses" do
+    c = Class.new(Thread)
+    t = c.start { }
+    t.should.is_a?(c)
+
+    t.join
+  end
+
+  it "does not call #initialize" do
+    c = Class.new(Thread) do
+      def initialize
+        ScratchPad.record :bad
+      end
+    end
+
+    t = c.start { }
+    t.join
+
+    ScratchPad.recorded.should == nil
   end
 end