public async Task RetrieveAsync_ReturnsAValidMessage()
{
// Arrange
cache.Setup(c => c.GetStringAsync(key)).ReturnsAsync(message);
cache.Setup(c => c.RemoveAsync(key)).Returns(Task.FromResult(false));
// Act
var result = await repository.RetrieveAsync(key);
// Assert
Assert.AreEqual(message, result);
cache.VerifyAll();
}