How does Malcolm test Macduff?

Malcolm tests Macduff by pretending to be an even worse tyrant than Macbeth in order to see whether Macduff is truly loyal to Scotland or secretly working for Macbeth.

When Macduff meets Malcolm in England and urges him to return and reclaim the throne, Malcolm does not trust him. So, instead of immediately agreeing, he claims that he would make a terrible king—worse than Macbeth—because he is supposedly full of uncontrollable lust, greed, and moral corruption. He portrays himself as someone who would destroy Scotland even more completely than Macbeth already has.

Macduff’s reaction is the key to the test. At first, he is horrified, but then he reaches a breaking point and declares that Scotland is doomed if Malcolm is truly so unfit to rule. Rather than supporting Malcolm out of ambition or convenience, Macduff is willing to abandon him entirely for the good of the country. His despair shows that he cares more about Scotland’s welfare than about gaining power or backing a particular ruler.

Only after seeing this response does Malcolm reveal the truth: he has been lying to test Macduff’s loyalty, and in reality he possesses none of the vices he described. Satisfied that Macduff is honest and devoted to Scotland rather than to personal gain or to Macbeth, Malcolm finally trusts him and agrees to join forces.

This moment clarifies what separates Macduff from Macbeth. Macbeth pursues power at any cost, while Macduff proves that true loyalty means putting the country above personal ambition, even if it means rejecting a potential king.