public void Message_ContainsCorrectText()
    {
        var e = new InvalidApiKeyException();

        Assert.Equal("The API key is unknown or expired", e.Message);
    }
    public void Is_HaveIBeenPwnedClientException()
    {
        var e = new InvalidApiKeyException();

        Assert.IsAssignableFrom <HaveIBeenPwnedClientException>(e);
    }