public async Task GetMultipleSchemasByName() { // arrange IMongoCollection <Schema> schemas = _mongoResource.CreateCollection <Schema>(); IMongoCollection <SchemaVersion> versions = _mongoResource.CreateCollection <SchemaVersion>(); IMongoCollection <SchemaPublishReport> publishReports = _mongoResource.CreateCollection <SchemaPublishReport>(); IMongoCollection <PublishedSchema> publishedSchemas = _mongoResource.CreateCollection <PublishedSchema>(); var a = new Schema("foo1", "bar"); var b = new Schema("foo2", "bar"); await schemas.InsertOneAsync(a, options : null, default); await schemas.InsertOneAsync(b, options : null, default); var repository = new SchemaRepository( schemas, versions, publishReports, publishedSchemas); // act IReadOnlyDictionary <string, Schema> retrieved = await repository.GetSchemasAsync(new[] { a.Name, b.Name }); // assert Assert.True(retrieved.ContainsKey(a.Name)); Assert.True(retrieved.ContainsKey(b.Name)); }