1 files changed, 80 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/throw_spec.rb b/spec/ruby/core/kernel/throw_spec.rb
new file mode 100644
index 0000000000..3f8d272d6d
--- /dev/null
+++ b/spec/ruby/core/kernel/throw_spec.rb
@@ -0,0 +1,80 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Kernel.throw" do
+  it "transfers control to the end of the active catch block waiting for symbol" do
+    catch(:blah) do
+      :value
+      throw :blah
+      fail("throw didn't transfer the control")
+    end.should be_nil
+  end
+
+  it "transfers control to the innermost catch block waiting for the same sympol" do
+    one = two = three = 0
+    catch :duplicate do
+      catch :duplicate do
+        catch :duplicate do
+          one = 1
+          throw :duplicate
+        end
+        two = 2
+        throw :duplicate
+      end
+      three = 3
+      throw :duplicate
+    end
+    [one, two, three].should == [1, 2, 3]
+  end
+
+  it "sets the return value of the catch block to nil by default" do
+    res = catch :blah do
+      throw :blah
+    end
+    res.should == nil
+  end
+
+  it "sets the return value of the catch block to a value specified as second parameter" do
+    res = catch :blah do
+      throw :blah, :return_value
+    end
+    res.should == :return_value
+  end
+
+  it "raises an ArgumentError if there is no catch block for the symbol" do
+    lambda { throw :blah }.should raise_error(ArgumentError)
+  end
+
+  it "raises an UncaughtThrowError if there is no catch block for the symbol" do
+    lambda { throw :blah }.should raise_error(UncaughtThrowError)
+  end
+
+  it "raises ArgumentError if 3 or more arguments provided" do
+    lambda {
+      catch :blah do
+        throw :blah, :return_value, 2
+      end
+    }.should raise_error(ArgumentError)
+
+    lambda {
+      catch :blah do
+        throw :blah, :return_value, 2, 3, 4, 5
+      end
+    }.should raise_error(ArgumentError)
+  end
+
+  it "can throw an object" do
+    lambda {
+      obj = Object.new
+      catch obj do
+        throw obj
+      end
+    }.should_not raise_error(NameError)
+  end
+end
+
+describe "Kernel#throw" do
+  it "is a private method" do
+    Kernel.should have_private_instance_method(:throw)
+  end
+end