public async Task GetStatistics_MemberIdIsValide_ShouldReturnMemberStatistics() { // arrange var memberId = _fixture.Create <int>(); var expectedMemberName = _fixture.Create <string>(); var expectedMembers = _fixture.Build <MemberStatistic>() .With(x => x.MemberName, expectedMemberName) .CreateMany() .ToArray(); _membersRepositoryMock.Setup(x => x.GetStatistics(memberId)) .ReturnsAsync(expectedMembers); // act var memberStatisrics = await _service.GetStatistics(memberId); // assert memberStatisrics.Should() .NotBeNull() .And .HaveCount(expectedMembers.Length) .And .Match <MemberStatistic[]>(x => x.All(f => f.MemberName == expectedMemberName)); _membersRepositoryMock.Verify(x => x.GetStatistics(memberId), Times.Once); }