Add users entity

ee/lib/ee/gitlab/scim/users.rb

+# frozen_string_literal: true
+
+module EE
+  module Gitlab
+    module Scim
+      class Users < Grape::Entity
+        expose :schemas
+        expose :total_results, as: :totalResults
+        expose :items_per_page, as: :itemsPerPage
+        expose :start_index, as: :startIndex
+
+        present_collection true, :Resources
+        expose :resources, as: :Resources, using: ::EE::Gitlab::Scim::User
+
+        private
+
+        DEFAULT_SCHEMA = 'urn:ietf:params:scim:api:messages:2.0:ListResponse'
+        ITEMS_PER_PAGE = 20
+        START_INDEX = 1
+
+        def schemas
+          [DEFAULT_SCHEMA]
+        end
+
+        def total_results
+          1
+        end
+
+        def items_per_page
+          ITEMS_PER_PAGE
+        end
+
+        def start_index
+          START_INDEX
+        end
+
+        # We only support a single resource at the moment
+        # Please update `total_results` to `resources.count` once this changes
+        def resources
+          [object]
+        end
+      end
+    end
+  end
+end

ee/spec/lib/gitlab/scim/users_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ::EE::Gitlab::Scim::Users do
+  let(:user) { build(:user) }
+  let(:identity) { build(:group_saml_identity, user: user) }
+
+  let(:entity) do
+    described_class.new(identity)
+  end
+
+  subject { entity.as_json }
+
+  it 'contains the schemas' do
+    expect(subject[:schemas]).to eq(['urn:ietf:params:scim:api:messages:2.0:ListResponse'])
+  end
+
+  it 'contains the totalResults' do
+    expect(subject[:totalResults]).to eq(1)
+  end
+
+  it 'contains the itemsPerPage' do
+    expect(subject[:itemsPerPage]).to eq(20)
+  end
+
+  it 'contains the startIndex' do
+    expect(subject[:startIndex]).to eq(1)
+  end
+
+  it 'contains the user' do
+    expect(subject[:Resources]).not_to be_empty
+  end
+
+  it 'contains the user ID' do
+    expect(subject[:Resources].first[:id]).to eq(identity.extern_uid)
+  end
+end