Test fees

[pictographer]

Update the integration test link of Check response for paying native CAPE tokens from faucet to pay fees to point to one of the following

• a single integration test that demonstrates the back end portion of the user story,
• a web page that describes and links to a collection of tests that demonstrate this, or
• a web page explaining why no test is needed.

Tests should demonstrate

• It is possible to obtain $CAPE asset records
• It is possible to build transactions with $CAPE fees
• Transactions with sufficient fees succeed
• Transactions with insufficient fees generate a reasonable error message

The conditions under which insufficient fee funds produces a failure are not likely to occur accidentally because the fees are currently set to zero. The user would need to either not use faucet to get $CAPE or transfer all their $CAPE tokens away. The front end should check this condition and direct the user to obtain more $CAPE tokens.