def test_exchange_trade():
"""Test the exchange class trade funciton with simple cases."""
binance = Exchange("binance")
binance.deposit("USD", 10)
assert (binance.trade("USD", "USD", 1, 1)), "This is a valid trade."
assert (binance.wallet["USD"] == 10), "Trade shouldn't have changed value"
assert (not binance.trade("USD", "USD", 11, 11)), "Amount too large."
assert (binance.trade("USD", "BTC", 5, 1)),\
"Should be able to trade to new."
assert (binance.wallet["USD"] == 5), "Trades should reduce fromCurrency."
assert (binance.wallet["BTC"] == 1), "Trades should increase toCurrency."
assert (binance.trade("BTC", "USD", 1, 1)), "Should be able to trade back."
assert (binance.wallet["BTC"] == 0), "Should go to zero."
def test_exchange_deposit():
"""Test the exchange class deposit funciton with simple cases."""
binance = Exchange("binance")
binance.deposit("USD", 10)
assert (binance.wallet["USD"] == 10),\
"Deposit of 10 should raise value to 10"
binance.deposit("BTC", 5)
assert (binance.wallet["BTC"] == 5), "Deposit of new currency should work."
binance.deposit("USD", 1)
assert (binance.wallet["USD"] == 11), "Multiple deposits should work."
