1 files changed, 154 insertions, 0 deletions
diff --git a/spec/ruby/language/hash_spec.rb b/spec/ruby/language/hash_spec.rb
new file mode 100644
index 0000000000..edd9d4fbb2
--- /dev/null
+++ b/spec/ruby/language/hash_spec.rb
@@ -0,0 +1,154 @@
+require File.expand_path('../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/hash_strings_ascii8bit', __FILE__)
+require File.expand_path('../fixtures/hash_strings_utf8', __FILE__)
+require File.expand_path('../fixtures/hash_strings_usascii', __FILE__)
+
+describe "Hash literal" do
+  it "{} should return an empty hash" do
+    {}.size.should == 0
+    {}.should == {}
+  end
+
+  it "{} should return a new hash populated with the given elements" do
+    h = {a: 'a', 'b' => 3, 44 => 2.3}
+    h.size.should == 3
+    h.should == {a: "a", "b" => 3, 44 => 2.3}
+  end
+
+  it "treats empty expressions as nils" do
+    h = {() => ()}
+    h.keys.should == [nil]
+    h.values.should == [nil]
+    h[nil].should == nil
+
+    h = {() => :value}
+    h.keys.should == [nil]
+    h.values.should == [:value]
+    h[nil].should == :value
+
+    h = {key: ()}
+    h.keys.should == [:key]
+    h.values.should == [nil]
+    h[:key].should == nil
+  end
+
+  it "freezes string keys on initialization" do
+    key = "foo"
+    h = {key => "bar"}
+    key.reverse!
+    h["foo"].should == "bar"
+    h.keys.first.should == "foo"
+    h.keys.first.frozen?.should == true
+    key.should == "oof"
+  end
+
+  it "checks duplicated keys on initialization" do
+    -> {
+      @h = eval "{foo: :bar, foo: :foo}"
+    }.should complain(/key :foo is duplicated|duplicated key/)
+    @h.keys.size.should == 1
+    @h.should == {foo: :foo}
+  end
+
+  it "accepts a hanging comma" do
+    h = {a: 1, b: 2,}
+    h.size.should == 2
+    h.should == {a: 1, b: 2}
+  end
+
+  it "recognizes '=' at the end of the key" do
+    eval("{:a==>1}").should == {:"a=" => 1}
+    eval("{:a= =>1}").should == {:"a=" => 1}
+    eval("{:a= => 1}").should == {:"a=" => 1}
+  end
+
+  it "with '==>' in the middle raises SyntaxError" do
+    lambda { eval("{:a ==> 1}") }.should raise_error(SyntaxError)
+  end
+
+  it "constructs a new hash with the given elements" do
+    {foo: 123}.should == {foo: 123}
+    h = {rbx: :cool, specs: 'fail_sometimes'}
+    {rbx: :cool, specs: 'fail_sometimes'}.should == h
+  end
+
+  it "ignores a hanging comma" do
+    {foo: 123,}.should == {foo: 123}
+    h = {rbx: :cool, specs: 'fail_sometimes'}
+    {rbx: :cool, specs: 'fail_sometimes',}.should == h
+  end
+
+  it "accepts mixed 'key: value' and 'key => value' syntax" do
+    h = {:a => 1, :b => 2, "c" => 3}
+    {a: 1, b: 2, "c" => 3}.should == h
+  end
+
+  it "accepts mixed 'key: value', 'key => value' and '\"key\"': value' syntax" do
+    h = {:a => 1, :b => 2, "c" => 3, :d => 4}
+    eval('{a: 1, :b => 2, "c" => 3, "d": 4}').should == h
+  end
+
+  it "expands an '**{}' element into the containing Hash literal initialization" do
+    {a: 1, **{b: 2}, c: 3}.should == {a: 1, b: 2, c: 3}
+  end
+
+  it "expands an '**obj' element into the containing Hash literal initialization" do
+    h = {b: 2, c: 3}
+    {**h, a: 1}.should == {b: 2, c: 3, a: 1}
+    {a: 1, **h}.should == {a: 1, b: 2, c: 3}
+    {a: 1, **h, c: 4}.should == {a: 1, b: 2, c: 4}
+  end
+
+  it "expands a BasicObject using ** into the containing Hash literal initialization" do
+    h = BasicObject.new
+    def h.to_hash; {:b => 2, :c => 3}; end
+    {**h, a: 1}.should == {b: 2, c: 3, a: 1}
+    {a: 1, **h}.should == {a: 1, b: 2, c: 3}
+    {a: 1, **h, c: 4}.should == {a: 1, b: 2, c: 4}
+  end
+
+  it "expands an '**{}' element with the last key/value pair taking precedence" do
+    -> {
+      @h = eval "{a: 1, **{a: 2, b: 3, c: 1}, c: 3}"
+    }.should complain(/key :a is duplicated|duplicated key/)
+    @h.should == {a: 2, b: 3, c: 3}
+  end
+
+  it "merges multiple nested '**obj' in Hash literals" do
+    -> {
+      @h = eval "{a: 1, **{a: 2, **{b: 3, **{c: 4}}, **{d: 5}, }, **{d: 6}}"
+    }.should complain(/key :a is duplicated|duplicated key/)
+    @h.should == {a: 2, b: 3, c: 4, d: 6}
+  end
+
+  it "calls #to_hash to expand an '**obj' element" do
+    obj = mock("hash splat")
+    obj.should_receive(:to_hash).and_return({b: 2, d: 4})
+
+    {a: 1, **obj, c: 3}.should == {a:1, b: 2, c: 3, d: 4}
+  end
+
+  it "raises a TypeError if any splatted elements keys are not symbols" do
+    h = {1 => 2, b: 3}
+    lambda { {a: 1, **h} }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError if #to_hash does not return a Hash" do
+    obj = mock("hash splat")
+    obj.should_receive(:to_hash).and_return(obj)
+
+    lambda { {**obj} }.should raise_error(TypeError)
+  end
+
+  it "does not change encoding of literal string keys during creation" do
+    ascii8bit_hash = HashStringsASCII8BIT.literal_hash
+    utf8_hash = HashStringsUTF8.literal_hash
+    usascii_hash = HashStringsUSASCII.literal_hash
+
+    ascii8bit_hash.keys.first.encoding.should == Encoding::ASCII_8BIT
+    ascii8bit_hash.keys.first.should == utf8_hash.keys.first
+    utf8_hash.keys.first.encoding.should == Encoding::UTF_8
+    utf8_hash.keys.first.should == usascii_hash.keys.first
+    usascii_hash.keys.first.encoding.should == Encoding::US_ASCII
+  end
+end