public void CheckIfBrandExists() { DbContextOptions <NoodleContext> options = new DbContextOptionsBuilder <NoodleContext>() .UseInMemoryDatabase("CanCheckIfBrandExists") .Options; using (NoodleContext context = new NoodleContext(options)) { //arrange Brand brand1 = new Brand(); brand1.Name = "Nongshim"; Brand brand2 = new Brand(); brand2.Name = "Ottogi"; Brand brand3 = new Brand(); brand3.Name = "Samyang"; BrandController bc = new BrandController(context); context.Brands.AddAsync(brand1); context.Brands.AddAsync(brand2); context.Brands.AddAsync(brand3); context.SaveChanges(); //act var findBrand = bc.BrandExists("Nongshim"); //assert Assert.True(findBrand); } }