public async Task ShouldReturnCountOfInchesOverlaping_When_ThreeClaimsOverlap(Mock <IAdventInputProvider> adventInput) { // Arrange adventInput.Setup(c => c.GetElfsFabricClaims()).ReturnsAsync(ElfsClaimsOnFibricWithThreeOverlaping()); var day3 = new Day3(adventInput.Object); // Act var result = await day3.CountFabricInchesOverlaping(); // Assert Assert.Equal(6, result); }