public void Seed_ValidOptions_Ok()
        {
            WitnessesLayerFragmentSeeder seeder = new WitnessesLayerFragmentSeeder();

            seeder.SetSeedOptions(_seedOptions);
            string[] ids = new[]
            {
                "alpha",
                "beta",
                "gamma"
            };
            seeder.Configure(new WitnessesLayerFragmentSeederOptions
            {
                Ids = ids
            });

            ITextLayerFragment fragment = seeder.GetFragment(_item, "1.1", "alpha");

            Assert.NotNull(fragment);

            WitnessesLayerFragment fr = fragment as WitnessesLayerFragment;

            Assert.NotNull(fr);

            Assert.Equal("1.1", fr.Location);
            Assert.NotEmpty(fr.Witnesses);
            foreach (Witness witness in fr.Witnesses)
            {
                Assert.True(Array.IndexOf(ids, witness.Id) > -1);
                Assert.NotNull(witness.Citation);
                Assert.NotNull(witness.Text);
            }
        }
        public void Seed_NoIds_Null()
        {
            WitnessesLayerFragmentSeeder seeder = new WitnessesLayerFragmentSeeder();

            seeder.SetSeedOptions(_seedOptions);
            seeder.Configure(new WitnessesLayerFragmentSeederOptions
            {
                Ids = Array.Empty <string>()  // invalid
            });

            Assert.Null(seeder.GetFragment(_item, "1.1", "alpha"));
        }