BBC News Online's Brian Wheeler asked City workers if they could name any of the tests.

Paul Bartlett, who described himself as vehemently opposed to the euro, performed best in the impromptu quiz, correctly identifying two of Mr Brown's tests.

Elna Taylor: 'euro is not working'

"Convergance is the first one," he said without hesitation.

A few moments of intense concentration brought a second correct answer - "employment" - before the 51-year-old business consultant was forced to admit to defeat.

"I am implacably hostile to the creation of a Federal European state," Mr Bartlett told BBC News Online.

"I see the single currency - or economic and monetary union - as a precursor to a federal state, so my opposition to it is political."

'Railroading' euro through

Elna Taylor, 51, a manager with an investment bank, said: "I have heard of the tests but I don't know what they are."

Mediha Ting said she had not heard of the tests

She said she was against the euro "because it doesn't seem to be working in Europe."

But she said she thought the government would "deal with it the way they have dealt with everything else, by just railroading it through."

'United Europe'

Mediha Ting, 27, who works for a commercial bank, was in favour of the euro, but had not heard of the five economic tests.

Mike Leech thinks 'patriotism' is an issue

After a little thought she said she "might have heard something about them on television."

She thought "better standard of living" was a key factor in deciding whether to join the euro.

"I am in favour of the euro because I would like to see a united Europe," she told BBC News Online.

'Patriotism'

Mike Leech, a lawyer with a leading high street bank, said: "I have heard of the five tests, I just could not recall what they are."

Les Wilton thinks euro entry is 'inevitable'

He thought inflation might be one of them and "patriotism" might also be a factor.

He was sceptical about the euro, he said, as "some countries might be let into the European Union whose economies were not strong enough."

Les Wilton, 56, a Lloyd's underwriter, said: "I could not name the five economic tests."

After a little prompting, he thought "inflation" and "exchange rates" might be two of them.

He said he thought euro entry was "inevitable, but I don't think that is necessarily a problem."

Pro-European

Graham McManus, 41, another underwriter, was the most pro-European of the bunch.

But he was just as stumped as the others when it came to naming the tests.

He thought "rate of exchange" and inflation might be two of them.

"It does surprise me that I am not aware of the tests, because I am pro-European.

"I don't think they have been very well publicised. I don't think they (the government) really want to talk about them.

"Until they call a referendum, they will probably try and get away with not mentioning them," he said.