What Satan did was treason.  Yet his treason was not like that of man.  For as a man may commit treason in America he may still flee to Chile.  Or he may be exiled to another country.  For there are many lands and many rulers.

But Satan desired equality with God.  Perhaps he even desired the very throne of God.  There are not many heavens or many gods.
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The treason of Satan allows him no place to run and no place to which he can be exiled for God is all in all.  But instead of immediate execution, the wisdom of God developed a use for this wicked one.

God intended the wickedness of Satan to test a people.  And not just any test, it is a test worthy of God himself.  After all, if Satan thought he was greater than God let it be proven in this place of testing.