public async Task CanCreateRole()
        {
            var result = await subject.CreateAsync(testRole, default(CancellationToken));

            Assert.Equal(IdentityResult.Success, result);
            var insertedRole = (await roles.FindAsync(r => r.Id == testRole.Id)).SingleOrDefault();

            Assert.NotNull(insertedRole);
            Assert.True(testRole.PropertiesEqual(insertedRole));
        }