1 files changed, 61 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/initialize_spec.rb b/spec/ruby/core/hash/initialize_spec.rb
new file mode 100644
index 0000000000..d13496ba3b
--- /dev/null
+++ b/spec/ruby/core/hash/initialize_spec.rb
@@ -0,0 +1,61 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Hash#initialize" do
+  it "is private" do
+    Hash.should have_private_instance_method("initialize")
+  end
+
+  it "can be used to reset default_proc" do
+    h = { "foo" => 1, "bar" => 2 }
+    h.default_proc.should == nil
+    h.send(:initialize) { |_, k| k * 2 }
+    h.default_proc.should_not == nil
+    h["a"].should == "aa"
+  end
+
+  it "can be used to reset the default value" do
+    h = {}
+    h.default = 42
+    h.default.should == 42
+    h.send(:initialize, 1)
+    h.default.should == 1
+    h.send(:initialize)
+    h.default.should == nil
+  end
+
+  it "receives the arguments passed to Hash#new" do
+    HashSpecs::NewHash.new(:one, :two)[0].should == :one
+    HashSpecs::NewHash.new(:one, :two)[1].should == :two
+  end
+
+  it "does not change the storage, only the default value or proc" do
+    h = HashSpecs::SubHashSettingInInitialize.new
+    h.to_a.should == [[:foo, :bar]]
+
+    h = HashSpecs::SubHashSettingInInitialize.new(:default)
+    h.to_a.should == [[:foo, :bar]]
+
+    h = HashSpecs::SubHashSettingInInitialize.new { :default_block }
+    h.to_a.should == [[:foo, :bar]]
+  end
+
+  it "returns self" do
+    h = Hash.new
+    h.send(:initialize).should equal(h)
+  end
+
+  it "raises a FrozenError if called on a frozen instance" do
+    block = -> { HashSpecs.frozen_hash.instance_eval { initialize() }}
+    block.should raise_error(FrozenError)
+
+    block = -> { HashSpecs.frozen_hash.instance_eval { initialize(nil) }  }
+    block.should raise_error(FrozenError)
+
+    block = -> { HashSpecs.frozen_hash.instance_eval { initialize(5) }    }
+    block.should raise_error(FrozenError)
+
+    block = -> { HashSpecs.frozen_hash.instance_eval { initialize { 5 } } }
+    block.should raise_error(FrozenError)
+  end
+end