Detect unicode downgrade fail (nvarchar to varchar)

;WITH unicodeDataSource
AS
(
  SELECT N'Hello' AS Text , N'English' AS Language UNION ALL
  SELECT N'Здравствуйте' AS Text, N'Russian' AS Language UNION ALL
  SELECT N'こんにちは' AS Text, N'Japanese' AS Language UNION ALL
  SELECT N'Hallå' AS Text, N'Swedish' AS Language 
)
SELECT *, 
  iif(s.Text = cast(cast(s.Text AS varchar(100)) AS nvarchar(100)) 
    ,1,0) AS CastWasSuccessful
FROM unicodeDataSource s

 Result
Text Language CastWasSuccessful
Hello English
1
Здравствуйте Russian
0
こんにちは Japanese
0
Hallå Swedish
1

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