public async Task IsManufacturerExistingByName_WithNonExistingManufacturerName_ShouldReturnFalse() { // Arrange FitStoreDbContext database = this.Database; DatabaseHelper.SeedData(database); IManufacturerService manufacturerService = new ManufacturerService(database); // Act bool result = await manufacturerService.IsManufacturerExistingByName(nonExistingManufacturerName); // Assert result.Should().Be(false); }