public async Task GetLogoBase64_ReturnsStringLogo() { // Arrange string logo = "logo"; _regionBlobStorage.Setup(x => x.GetBlobBase64Async(It.IsAny <string>())).ReturnsAsync(logo); // Act var result = await _regionService.GetLogoBase64(logo); // Assert Assert.IsInstanceOf <string>(result); Assert.IsNotNull(result); }