1 files changed, 255 insertions, 0 deletions
diff --git a/spec/ruby/core/struct/new_spec.rb b/spec/ruby/core/struct/new_spec.rb
new file mode 100644
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+++ b/spec/ruby/core/struct/new_spec.rb
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+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Struct.new" do
+  it "creates a constant in Struct namespace with string as first argument" do
+    struct = Struct.new('Animal', :name, :legs, :eyeballs)
+    struct.should == Struct::Animal
+    struct.name.should == "Struct::Animal"
+  ensure
+    Struct.send(:remove_const, :Animal)
+  end
+
+  it "overwrites previously defined constants with string as first argument" do
+    first = Struct.new('Person', :height, :weight)
+    first.should == Struct::Person
+
+    second = nil
+    -> {
+      second = Struct.new('Person', :hair, :sex)
+    }.should complain(/constant/)
+    second.should == Struct::Person
+
+    first.members.should_not == second.members
+  ensure
+    Struct.send(:remove_const, :Person)
+  end
+
+  it "calls to_str on its first argument (constant name)" do
+    obj = mock('Foo')
+    def obj.to_str() "Foo" end
+    struct = Struct.new(obj)
+    struct.should == Struct::Foo
+    struct.name.should == "Struct::Foo"
+  ensure
+    Struct.send(:remove_const, :Foo)
+  end
+
+  it "creates a new anonymous class with nil first argument" do
+    struct = Struct.new(nil, :foo)
+    struct.new("bar").foo.should == "bar"
+    struct.should.is_a?(Class)
+    struct.name.should == nil
+  end
+
+  it "creates a new anonymous class with symbol arguments" do
+    struct = Struct.new(:make, :model)
+    struct.should.is_a?(Class)
+    struct.name.should == nil
+  end
+
+  it "does not create a constant with symbol as first argument" do
+    Struct.new(:Animal2, :name, :legs, :eyeballs)
+    Struct.const_defined?("Animal2").should == false
+  end
+
+  it "allows non-ASCII member name" do
+    name = "r\xe9sum\xe9".dup.force_encoding(Encoding::ISO_8859_1).to_sym
+    struct = Struct.new(name)
+    struct.new("foo").send(name).should == "foo"
+  end
+
+  it "fails with invalid constant name as first argument" do
+    -> { Struct.new('animal', :name, :legs, :eyeballs) }.should.raise(NameError)
+  end
+
+  it "raises a TypeError if object doesn't respond to to_sym" do
+    -> { Struct.new(:animal, mock('giraffe'))      }.should.raise(TypeError)
+    -> { Struct.new(:animal, 1.0)                  }.should.raise(TypeError)
+    -> { Struct.new(:animal, Time.now)             }.should.raise(TypeError)
+    -> { Struct.new(:animal, Class)                }.should.raise(TypeError)
+    -> { Struct.new(:animal, nil)                  }.should.raise(TypeError)
+    -> { Struct.new(:animal, true)                 }.should.raise(TypeError)
+    -> { Struct.new(:animal, ['chris', 'evan'])    }.should.raise(TypeError)
+  end
+
+  it "raises a TypeError if passed a Hash with an unknown key" do
+    -> { Struct.new(:animal, { name: 'chris' }) }.should.raise(TypeError)
+  end
+
+  it "works when not provided any arguments" do
+    c = Struct.new
+    c.should.is_a?(Class)
+    c.superclass.should == Struct
+  end
+
+  it "raises ArgumentError when there is a duplicate member" do
+    -> { Struct.new(:foo, :foo) }.should.raise(ArgumentError, "duplicate member: foo")
+  end
+
+  it "raises a TypeError if object is not a Symbol" do
+    obj = mock(':ruby')
+    def obj.to_sym() :ruby end
+    -> { Struct.new(:animal, obj) }.should.raise(TypeError)
+  end
+
+  it "processes passed block with instance_eval" do
+    klass = Struct.new(:something) { @something_else = 'something else entirely!' }
+    klass.instance_variables.should.include?(:@something_else)
+  end
+
+  context "with a block" do
+    it "allows class to be modified via the block" do
+      klass = Struct.new(:version) do
+        def platform
+          :ruby
+        end
+      end
+      instance = klass.new('2.2')
+
+      instance.version.should == '2.2'
+      instance.platform.should == :ruby
+    end
+
+    it "passes same struct class to the block" do
+      given = nil
+      klass = Struct.new(:attr) do |block_parameter|
+        given = block_parameter
+      end
+      klass.should.equal?(given)
+    end
+  end
+
+  context "on subclasses" do
+    it "creates a constant in subclass' namespace" do
+      struct = StructClasses::Apple.new('Computer', :size)
+      struct.should == StructClasses::Apple::Computer
+    ensure
+      StructClasses::Apple.send(:remove_const, :Computer)
+    end
+
+    it "creates an instance" do
+      StructClasses::Ruby.new.kind_of?(StructClasses::Ruby).should == true
+    end
+
+    it "creates reader methods" do
+      StructClasses::Ruby.new.should.respond_to?(:version)
+      StructClasses::Ruby.new.should.respond_to?(:platform)
+    end
+
+    it "creates writer methods" do
+      StructClasses::Ruby.new.should.respond_to?(:version=)
+      StructClasses::Ruby.new.should.respond_to?(:platform=)
+    end
+
+    it "fails with too many arguments" do
+      -> { StructClasses::Ruby.new('2.0', 'i686', true) }.should.raise(ArgumentError)
+    end
+
+    it "accepts keyword arguments to initialize" do
+      type = Struct.new(:args)
+
+      obj = type.new(args: 42)
+      obj2 = type.new(42)
+
+      obj.should == obj2
+      obj.args.should == 42
+      obj2.args.should == 42
+    end
+
+    context "given positional and keyword arguments" do
+      it "treats keyword arguments as a positional parameter" do
+        type = Struct.new(:a, :b)
+        s = type.new("a", b: "b")
+        s.a.should == "a"
+        s.b.should == {b: "b"}
+
+        type = Struct.new(:a, :b, :c)
+        s = type.new("a", b: "b", c: "c")
+        s.a.should == "a"
+        s.b.should == {b: "b", c: "c"}
+        s.c.should == nil
+      end
+
+      it "ignores empty keyword arguments" do
+        type = Struct.new(:a, :b)
+        h = {}
+        s = type.new("a", **h)
+
+        s.a.should == "a"
+        s.b.should == nil
+      end
+
+      it "raises ArgumentError when all struct attribute values are specified" do
+        type = Struct.new(:a, :b)
+        -> { type.new("a", "b", c: "c") }.should.raise(ArgumentError, "struct size differs")
+      end
+    end
+  end
+
+  context "keyword_init: true option" do
+    before :all do
+      @struct_with_kwa = Struct.new(:name, :legs, keyword_init: true)
+    end
+
+    it "creates a class that accepts keyword arguments to initialize" do
+      obj = @struct_with_kwa.new(name: "elefant", legs: 4)
+      obj.name.should == "elefant"
+      obj.legs.should == 4
+    end
+
+    it "raises when there is a duplicate member" do
+      -> { Struct.new(:foo, :foo, keyword_init: true) }.should.raise(ArgumentError, "duplicate member: foo")
+    end
+
+    describe "new class instantiation" do
+      it "accepts arguments as hash as well" do
+        obj = @struct_with_kwa.new({name: "elefant", legs: 4})
+        obj.name.should == "elefant"
+        obj.legs.should == 4
+      end
+
+      it "allows missing arguments" do
+        obj = @struct_with_kwa.new(name: "elefant")
+        obj.name.should == "elefant"
+        obj.legs.should == nil
+      end
+
+      it "allows no arguments" do
+        obj = @struct_with_kwa.new
+        obj.name.should == nil
+        obj.legs.should == nil
+      end
+
+      it "raises ArgumentError when passed not declared keyword argument" do
+        -> {
+          @struct_with_kwa.new(name: "elefant", legs: 4, foo: "bar")
+        }.should.raise(ArgumentError, /unknown keywords: foo/)
+      end
+
+      it "raises ArgumentError when passed a list of arguments" do
+        -> {
+          @struct_with_kwa.new("elefant", 4)
+        }.should.raise(ArgumentError, /wrong number of arguments/)
+      end
+
+      it "raises ArgumentError when passed a single non-hash argument" do
+        -> {
+          @struct_with_kwa.new("elefant")
+        }.should.raise(ArgumentError, /wrong number of arguments/)
+      end
+    end
+  end
+
+  context "keyword_init: false option" do
+    before :all do
+      @struct_without_kwa = Struct.new(:name, :legs, keyword_init: false)
+    end
+
+    it "behaves like it does without :keyword_init option" do
+      obj = @struct_without_kwa.new("elefant", 4)
+      obj.name.should == "elefant"
+      obj.legs.should == 4
+    end
+  end
+end