require "spec_helper"

module Hexx
  describe Coercible do

    # ==========================================================================
    # Prepare environment
    # ==========================================================================

    before { class  TestModel; extend Coercible; end }
    before { module TestModule;  end }
    before { class  TestCoercion < Struct.new(:string); end }

    let(:test_model)    { TestModel   }
    let(:test_module)   { TestModule  }
    let(:test_coercion) { TestCoercion }

    after { Hexx.send :remove_const, :TestCoercion }
    after { Hexx.send :remove_const, :TestModule  }
    after { Hexx.send :remove_const, :TestModel   }

    # ==========================================================================
    # Run tests
    # ==========================================================================

    describe ".attr_coerced" do

      context "when the name is neither type nor symbol" do

        it "fails with TypeError" do
          expect { test_model.send :attr_coerced, 1, type: test_coercion }
            .to raise_error(TypeError)
        end
      end

      context "when the name is empty" do

        it "fails with ArgumentError" do
          expect { test_model.send :attr_coerced, "", type: test_coercion }
            .to raise_error(ArgumentError)
        end
      end

      context "when no type is set" do

        it "fails with ArgumentError" do
          expect { test_model.send :attr_coerced, :name }
            .to raise_error(ArgumentError)
        end
      end

      context "when a type is not a class" do

        it "fails with TypeError" do
          expect { test_model.send :attr_coerced, :name, type: test_module }
            .to raise_error(TypeError)
        end
      end

      context "with valid arguments" do

        before  { test_model.send :attr_coerced, :name, type: test_coercion }
        subject { test_model.new }

        it "coerces an attribute with given type" do
          subject.name = "some name"
          expect(subject.name).to be_kind_of test_coercion
        end
      end
    end
  end
end