How can you gurantee that she/he is your friend?

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Is not how long years being a good friend gurantee that she is really your friend but during the hard times that you are together. Money can also a big factor that break the friendship. Like us we're been a good friends in years.What if one of your friend think bad about you. While the other one have no doubts and trust you. Till the point that she attacts you personally that she's destroying you as a person morally and speritually. Then you decided to end it up giving back her investment more than 300% she shared in your investments as friends that you know she don't deserve to have that cause she never work . After that she become good to you again .While simple THANK you to other friend who trust you. Is there a gurantee of frienship? How can you tell at first she/ he is your friend? Tell me?