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I had to whittle your question down. 

Malcolm says to Macduff: “He hath not touched you yet.” Malcolm wonders if Macduff is working with Macbeth. At this point, Malcolm’s father has been killed and as far as they both know, Macbeth has not harmed Macduff or any of his family. Malcolm also questioned how Macduff could leave his family so quickly.

Perchance even there where I did find my doubts.

Why in that rawness left you wife and child.

Malcolm suspects that Macduff might be on Macbeth’s side since he felt confident in leaving his family in Scotland. Macduff, in fact, left with Malcolm to secure an army and to support Malcolm as the rightful heir to the throne. Macduff has been consistently loyal to Duncan and Malcolm. Macduff leaving his family was perhaps foolish but not malicious. 

After Macduff effusively praises Duncan and despises a Scotland ruled by Macbeth, Malcolm begins to trust his loyalty. This trust is quickly confirmed when Ross tells them Macduff’s family has been slaughtered.

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In Macbeth, why does Malcolm test Macduff?

Unlike his father, who trusted too readily, Malcolm does not trust Macduff. Here, Malcolm shows his political savvy. He knows he is likely to be sacrificed (an innocent lamb to appease an angry god), and is well aware of Macbeth's will to harm him. He thinks Macduff is a potential enemy, for he knows that Macduff once thought highly of Macbeth. He also thinks that Macduff could profit by helping Macbeth and--this is dramatic irony--thinks that Macduff has somehow remained unharmed (we know otherwise, but neither Macduff nor Malcolm know yet).
Unlike his father, Malcolm understands that things can appear fair (beautiful and honest) on the outside yet be foul (evil) within. He wants to know what lies within. The only way for him to be certain is to test Macduff's character. Had Maduff agreed to back Malcolm regardless of how corrupt Malcolm claimed to be, Macduff would have revealed a weakness in his own character and would also have revealed to Malcolm his willingness to support anyone he thought would win. If Macduff would follow a ruler as corrupt as Malcolm claims to be, he would also follow Macbeth.The only way Malcolm could tell for sure that Macduff was on the right side was to test him.

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