Add a PackageType type to graphql

- Package type
- Package type enum
- unit tests
Co-authored-by: Tetiana Chupryna <tchupryna@gitlab.com>
Co-authored-by: David Fernandez <dfernandez@gitlab.com>
Co-authored-by: Nick Kipling <nkipling@gitlab.com>
Co-authored-by: Steve Abrams <sabrams@gitlab.com>

ee/app/graphql/types/package_type.rb

+# frozen_string_literal: true
+
+module Types
+  # rubocop: disable Graphql/AuthorizeTypes
+  class PackageType < BaseObject
+    graphql_name 'Package'
+    description 'Represents a package'
+
+    field :id, GraphQL::ID_TYPE, null: false, description: 'The ID of the package'
+    field :name, GraphQL::STRING_TYPE, null: false, description: 'The name of the package'
+    field :created_at, Types::TimeType, null: false, description: 'The created date'
+    field :updated_at, Types::TimeType, null: false, description: 'The update date'
+    field :version, GraphQL::STRING_TYPE, null: true, description: 'The version of the package'
+    field :package_type, Types::PackageTypeEnum, null: false, description: 'The type of the package'
+  end
+  # rubocop: enable Graphql/AuthorizeTypes
+end

ee/app/graphql/types/package_type_enum.rb

+# frozen_string_literal: true
+
+module Types
+  class PackageTypeEnum < BaseEnum
+    ::Packages::Package.package_types.keys.each do |package_type|
+        value package_type.to_s.upcase, value: package_type.to_s
+    end
+  end
+end
+  
\ No newline at end of file

ee/spec/graphql/types/package_type_enum_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GitlabSchema.types['PackageTypeEnum'] do
+  it 'exposes all package types' do
+    expect(described_class.values.keys).to contain_exactly(*%w[MAVEN NPM CONAN NUGET PYPI COMPOSER])
+  end
+end

ee/spec/graphql/types/package_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GitlabSchema.types['Package'] do
+  it { expect(described_class.graphql_name).to eq('Package') }
+
+  it 'includes all the package fields' do
+    expected_fields = %w[
+        id name version created_at updated_at package_type
+    ]
+
+    expect(described_class).to include_graphql_fields(*expected_fields)
+  end
+end