Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 110 insertions, 0 deletions

diff --git a/spec/rubyspec/core/hash/constructor_spec.rb b/spec/rubyspec/core/hash/constructor_spec.rb
new file mode 100644
index 0000000000..0f582d91de
--- /dev/null
+++ b/spec/rubyspec/core/hash/constructor_spec.rb
@@ -0,0 +1,110 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Hash.[]" do
+  describe "passed zero arguments" do
+    it "returns an empty hash" do
+      Hash[].should == {}
+    end
+  end
+
+  it "creates a Hash; values can be provided as the argument list" do
+    Hash[:a, 1, :b, 2].should == { a: 1, b: 2 }
+    Hash[].should == {}
+    Hash[:a, 1, :b, { c: 2 }].should == { a: 1, b: { c: 2 } }
+  end
+
+  it "creates a Hash; values can be provided as one single hash" do
+    Hash[a: 1, b: 2].should == { a: 1, b: 2 }
+    Hash[{1 => 2, 3 => 4}].should == {1 => 2, 3 => 4}
+    Hash[{}].should == {}
+  end
+
+  describe "passed an array" do
+    it "treats elements that are 2 element arrays as key and value" do
+      Hash[[[:a, :b], [:c, :d]]].should == { a: :b, c: :d }
+    end
+
+    it "treats elements that are 1 element arrays as keys with value nil" do
+      Hash[[[:a]]].should == { a: nil }
+    end
+  end
+
+  # #1000 #1385
+  it "creates a Hash; values can be provided as a list of value-pairs in an array" do
+    Hash[[[:a, 1], [:b, 2]]].should == { a: 1, b: 2 }
+  end
+
+  it "coerces a single argument which responds to #to_ary" do
+    ary = mock('to_ary')
+    ary.should_receive(:to_ary).and_return([[:a, :b]])
+
+    Hash[ary].should == { a: :b }
+  end
+
+  it "ignores elements that are not arrays" do
+    -> {
+      Hash[[:a]].should == {}
+    }.should complain(/ignoring wrong elements/)
+    -> {
+      Hash[[:nil]].should == {}
+    }.should complain(/ignoring wrong elements/)
+  end
+
+  it "raises an ArgumentError for arrays of more than 2 elements" do
+    lambda{ Hash[[[:a, :b, :c]]].should == {} }.should raise_error(ArgumentError)
+  end
+
+  it "raises an ArgumentError when passed a list of value-invalid-pairs in an array" do
+    -> {
+      -> {
+        Hash[[[:a, 1], [:b], 42, [:d, 2], [:e, 2, 3], []]]
+      }.should complain(/ignoring wrong elements/)
+    }.should raise_error(ArgumentError)
+  end
+
+  describe "passed a single argument which responds to #to_hash" do
+    it "coerces it and returns a copy" do
+      h = { a: :b, c: :d }
+      to_hash = mock('to_hash')
+      to_hash.should_receive(:to_hash).and_return(h)
+
+      result = Hash[to_hash]
+      result.should == h
+      result.should_not equal(h)
+    end
+  end
+
+  it "raises an ArgumentError when passed an odd number of arguments" do
+    lambda { Hash[1, 2, 3] }.should raise_error(ArgumentError)
+    lambda { Hash[1, 2, { 3 => 4 }] }.should raise_error(ArgumentError)
+  end
+
+  it "calls to_hash" do
+    obj = mock('x')
+    def obj.to_hash() { 1 => 2, 3 => 4 } end
+    Hash[obj].should == { 1 => 2, 3 => 4 }
+  end
+
+  it "returns an instance of a subclass when passed an Array" do
+    HashSpecs::MyHash[1,2,3,4].should be_an_instance_of(HashSpecs::MyHash)
+  end
+
+  it "returns instances of subclasses" do
+    HashSpecs::MyHash[].should be_an_instance_of(HashSpecs::MyHash)
+  end
+
+  it "returns an instance of the class it's called on" do
+    Hash[HashSpecs::MyHash[1, 2]].class.should == Hash
+    HashSpecs::MyHash[Hash[1, 2]].should be_an_instance_of(HashSpecs::MyHash)
+  end
+
+  it "does not call #initialize on the subclass instance" do
+    HashSpecs::MyInitializerHash[Hash[1, 2]].should be_an_instance_of(HashSpecs::MyInitializerHash)
+  end
+
+  it "removes the default_proc" do
+    hash = Hash.new { |h, k| h[k] = [] }
+    Hash[hash].default_proc.should be_nil
+  end
+end