1 files changed, 51 insertions, 0 deletions
diff --git a/spec/graphql/resolvers/users_resolver_spec.rb b/spec/graphql/resolvers/users_resolver_spec.rb
new file mode 100644
index 00000000000..e752500d52f
--- /dev/null
+++ b/spec/graphql/resolvers/users_resolver_spec.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Resolvers::UsersResolver do
+  include GraphqlHelpers
+
+  let_it_be(:user1) { create(:user) }
+  let_it_be(:user2) { create(:user) }
+
+  describe '#resolve' do
+    it 'raises an error when read_users_list is not authorized' do
+      expect(Ability).to receive(:allowed?).with(nil, :read_users_list).and_return(false)
+
+      expect { resolve_users }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+    end
+
+    context 'when no arguments are passed' do
+      it 'returns all users' do
+        expect(resolve_users).to contain_exactly(user1, user2)
+      end
+    end
+
+    context 'when both ids and usernames are passed ' do
+      it 'raises an error' do
+        expect { resolve_users(ids: [user1.to_global_id.to_s], usernames: [user1.username]) }
+        .to raise_error(Gitlab::Graphql::Errors::ArgumentError)
+      end
+    end
+
+    context 'when a set of IDs is passed' do
+      it 'returns those users' do
+        expect(
+          resolve_users(ids: [user1.to_global_id.to_s, user2.to_global_id.to_s])
+        ).to contain_exactly(user1, user2)
+      end
+    end
+
+    context 'when a set of usernames is passed' do
+      it 'returns those users' do
+        expect(
+          resolve_users(usernames: [user1.username, user2.username])
+        ).to contain_exactly(user1, user2)
+      end
+    end
+  end
+
+  def resolve_users(args = {})
+    resolve(described_class, args: args)
+  end
+end