Contents

require "dry-types"

describe "type constraint" do
  context "by a proc with 1 argument" do
    before do
      class Test::Foo
        extend Dry::Initializer
        param :foo, proc(&:to_s), optional: true
      end
    end

    subject { Test::Foo.new :foo }

    it "coerces a value" do
      expect(subject.foo).to eq "foo"
    end
  end

  context "by a proc with 2 arguments" do
    before do
      class Test::Foo
        extend Dry::Initializer
        param :foo, proc { |val, obj| "#{obj.hash}:#{val}" }, optional: true
      end
    end

    subject { Test::Foo.new :foo }

    it "coerces a value with self as a second argument" do
      expect(subject.foo).to eq "#{subject.hash}:foo"
    end
  end

  context "by dry-type" do
    before do
      class Test::Foo
        extend Dry::Initializer
        param :foo, Dry::Types["strict.string"], optional: true
      end
    end

    context "in case of mismatch" do
      subject { Test::Foo.new 1 }

      it "raises ArgumentError" do
        expect { subject }.to raise_error TypeError, /1/
      end
    end

    context "in case of match" do
      subject { Test::Foo.new "foo" }

      it "completes the initialization" do
        expect { subject }.not_to raise_error
      end
    end

    context "if optional value not set" do
      subject { Test::Foo.new }

      it "not applicable to Dry::Initializer::UNDEFINED" do
        expect(subject.instance_variable_get(:@foo))
          .to eq Dry::Initializer::UNDEFINED
      end
    end
  end

  context "by invalid constraint" do
    it "raises ArgumentError" do
      expect do
        class Test::Foo
          extend Dry::Initializer
          param :foo, type: String
        end
      end.to raise_error(ArgumentError)
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
dry-initializer-3.0.0	spec/type_constraint_spec.rb