1 files changed, 80 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/default_proc_spec.rb b/spec/ruby/core/hash/default_proc_spec.rb
new file mode 100644
index 0000000000..4830e02acd
--- /dev/null
+++ b/spec/ruby/core/hash/default_proc_spec.rb
@@ -0,0 +1,80 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Hash#default_proc" do
+  it "returns the block passed to Hash.new" do
+    h = Hash.new { 'Paris' }
+    p = h.default_proc
+    p.call(1).should == 'Paris'
+  end
+
+  it "returns nil if no block was passed to proc" do
+    {}.default_proc.should == nil
+  end
+end
+
+describe "Hash#default_proc=" do
+  it "replaces the block passed to Hash.new" do
+    h = Hash.new { 'Paris' }
+    h.default_proc = Proc.new { 'Montreal' }
+    p = h.default_proc
+    p.call(1).should == 'Montreal'
+  end
+
+  it "uses :to_proc on its argument" do
+    h = Hash.new { 'Paris' }
+    obj = mock('to_proc')
+    obj.should_receive(:to_proc).and_return(Proc.new { 'Montreal' })
+    (h.default_proc = obj).should.equal?(obj)
+    h[:cool_city].should == 'Montreal'
+  end
+
+  it "overrides the static default" do
+    h = Hash.new(42)
+    h.default_proc = Proc.new { 6 }
+    h.default.should == nil
+    h.default_proc.call.should == 6
+  end
+
+  it "raises an error if passed stuff not convertible to procs" do
+    ->{{}.default_proc = 42}.should.raise(TypeError)
+  end
+
+  it "returns the passed Proc" do
+    new_proc = Proc.new {}
+    ({}.default_proc = new_proc).should.equal?(new_proc)
+  end
+
+  it "clears the default proc if passed nil" do
+    h = Hash.new { 'Paris' }
+    h.default_proc = nil
+    h.default_proc.should == nil
+    h[:city].should == nil
+  end
+
+  it "returns nil if passed nil" do
+    ({}.default_proc = nil).should == nil
+  end
+
+  it "accepts a lambda with an arity of 2" do
+    h = {}
+    -> do
+      h.default_proc = -> a, b { }
+    end.should_not.raise(TypeError)
+  end
+
+  it "raises a TypeError if passed a lambda with an arity other than 2" do
+    h = {}
+    -> do
+      h.default_proc = -> a { }
+    end.should.raise(TypeError)
+    -> do
+      h.default_proc = -> a, b, c { }
+    end.should.raise(TypeError)
+  end
+
+  it "raises a FrozenError if self is frozen" do
+    -> { {}.freeze.default_proc = Proc.new {} }.should.raise(FrozenError)
+    -> { {}.freeze.default_proc = nil }.should.raise(FrozenError)
+  end
+end