Full coverage with balance checks (#72)

* BuyOrderIssuer full line coverage

* BuyOrderIssuer balance checks

* DirectBuyIssuer full coverage

* SellOrderProcessor full coverage

* OrderProcessor full coverage

.gas-snapshot

@@ -9,30 +9,41 @@ BridgedERC20Test:testSetSymbol(string) (runs: 518, μ: 61557, ~: 68720)
 BridgedERC20Test:testTransfer() (gas: 102095)
 BridgedERC20Test:testTransferRestrictedFromReverts() (gas: 121429)
 BridgedERC20Test:testTransferRestrictedToReverts() (gas: 123593)
-DirectBuyIssuerTest:testCancelOrder(uint128,uint128,string) (runs: 518, μ: 390732, ~: 399178)
-DirectBuyIssuerTest:testCancelOrderNotFoundReverts() (gas: 56914)
-DirectBuyIssuerTest:testFillOrder(uint128,uint128,uint128,uint256) (runs: 518, μ: 356326, ~: 346097)
-DirectBuyIssuerTest:testFillorderNoOrderReverts() (gas: 56726)
-DirectBuyIssuerTest:testGetInputValue(uint128) (runs: 518, μ: 36554, ~: 36591)
-DirectBuyIssuerTest:testInitialize(address,address) (runs: 518, μ: 7403169, ~: 7403169)
-DirectBuyIssuerTest:testRequestCancel() (gas: 286625)
-DirectBuyIssuerTest:testRequestCancelNotFoundReverts() (gas: 29865)
-DirectBuyIssuerTest:testRequestCancelNotRequesterReverts() (gas: 280092)
-DirectBuyIssuerTest:testRequestOrder(uint128) (runs: 518, μ: 224574, ~: 294831)
-DirectBuyIssuerTest:testRequestOrderCollisionReverts() (gas: 281979)
-DirectBuyIssuerTest:testRequestOrderPausedReverts() (gas: 58768)
-DirectBuyIssuerTest:testRequestOrderUnsupportedAssetReverts(address) (runs: 518, μ: 115137, ~: 115137)
-DirectBuyIssuerTest:testRequestOrderUnsupportedPaymentReverts(address) (runs: 518, μ: 117648, ~: 117648)
-DirectBuyIssuerTest:testRequestOrderWithPermit() (gas: 352676)
-DirectBuyIssuerTest:testReturnEscrow(uint128,uint256) (runs: 518, μ: 331937, ~: 327526)
-DirectBuyIssuerTest:testSetFees(address) (runs: 518, μ: 24723, ~: 24723)
-DirectBuyIssuerTest:testSetOrdersPaused(bool) (runs: 518, μ: 22642, ~: 21745)
-DirectBuyIssuerTest:testSetTreasury(address) (runs: 518, μ: 24885, ~: 24885)
-DirectBuyIssuerTest:testTakeEscrow(uint128,uint256) (runs: 518, μ: 304783, ~: 289105)
+BuyOrderIssuerTest:testCancelOrder(uint128,uint128,string) (runs: 518, μ: 370916, ~: 378792)
+BuyOrderIssuerTest:testCancelOrderNotFoundReverts() (gas: 54694)
+BuyOrderIssuerTest:testFillOrder(uint128,uint128,uint256) (runs: 518, μ: 338614, ~: 382418)
+BuyOrderIssuerTest:testFillorderNoOrderReverts() (gas: 54549)
+BuyOrderIssuerTest:testFulfillOrder(uint128,uint256) (runs: 518, μ: 342504, ~: 344288)
+BuyOrderIssuerTest:testGetInputValue(uint64,uint64,uint128) (runs: 518, μ: 628977, ~: 632845)
+BuyOrderIssuerTest:testInitialize(address,address) (runs: 518, μ: 7013243, ~: 7013243)
+BuyOrderIssuerTest:testInitializeZeroOwnerReverts() (gas: 3449093)
+BuyOrderIssuerTest:testInitializeZeroTreasuryReverts() (gas: 3523035)
+BuyOrderIssuerTest:testNoFees(uint128) (runs: 518, μ: 20350, ~: 20350)
+BuyOrderIssuerTest:testRequestCancel() (gas: 261898)
+BuyOrderIssuerTest:testRequestCancelNotFoundReverts() (gas: 27787)
+BuyOrderIssuerTest:testRequestCancelNotRequesterReverts() (gas: 255440)
+BuyOrderIssuerTest:testRequestOrder(uint128) (runs: 518, μ: 208947, ~: 272336)
+BuyOrderIssuerTest:testRequestOrderCollisionReverts() (gas: 257327)
+BuyOrderIssuerTest:testRequestOrderPausedReverts() (gas: 56734)
+BuyOrderIssuerTest:testRequestOrderUnsupportedAssetReverts(address) (runs: 518, μ: 113169, ~: 113169)
+BuyOrderIssuerTest:testRequestOrderUnsupportedPaymentReverts(address) (runs: 518, μ: 115636, ~: 115636)
+BuyOrderIssuerTest:testRequestOrderWithPermit() (gas: 333250)
+BuyOrderIssuerTest:testRequestOrderWithPermitCollisionReverts() (gas: 299841)
+BuyOrderIssuerTest:testSetFees(address) (runs: 518, μ: 24723, ~: 24723)
+BuyOrderIssuerTest:testSetOrdersPaused(bool) (runs: 518, μ: 22686, ~: 21789)
+BuyOrderIssuerTest:testSetTreasury(address) (runs: 518, μ: 25267, ~: 25267)
+BuyOrderIssuerTest:testSetTreasuryZeroReverts() (gas: 15982)
+DirectBuyIssuerTest:testCancelOrder(uint128,uint128,string) (runs: 518, μ: 389509, ~: 397094)
+DirectBuyIssuerTest:testCancelOrderUnreturnedEscrowReverts(uint128,uint128) (runs: 518, μ: 323685, ~: 323685)
+DirectBuyIssuerTest:testFillOrder(uint128,uint128,uint128,uint256) (runs: 518, μ: 356933, ~: 343592)
+DirectBuyIssuerTest:testReturnEscrow(uint128,uint256) (runs: 518, μ: 329431, ~: 324973)
+DirectBuyIssuerTest:testTakeEscrow(uint128,uint256) (runs: 518, μ: 301280, ~: 286699)
 OrderFeesTest:testRecoverInputValueFromRemaining(uint64,uint128) (runs: 518, μ: 22551, ~: 22896)
 OrderFeesTest:testSetFee(uint64,uint64,uint8,uint128) (runs: 518, μ: 589862, ~: 726435)
 OrderFeesTest:testUSDC() (gas: 15635)
-SellOrderProcessorTest:testCancelOrder(uint128,uint128,string) (runs: 518, μ: 389666, ~: 389693)
-SellOrderProcessorTest:testFillOrder(uint128,uint128,uint256) (runs: 518, μ: 336501, ~: 325645)
-SellOrderProcessorTest:testRequestOrder(uint128) (runs: 518, μ: 248541, ~: 254285)
+SellOrderProcessorTest:testCancelOrder(uint128,uint128,uint128,string) (runs: 518, μ: 399734, ~: 423048)
+SellOrderProcessorTest:testFillOrder(uint128,uint128,uint256) (runs: 518, μ: 339591, ~: 325645)
+SellOrderProcessorTest:testFulfillOrder(uint128,uint256) (runs: 518, μ: 372815, ~: 385584)
+SellOrderProcessorTest:testNoFees(uint128) (runs: 518, μ: 19436, ~: 19436)
+SellOrderProcessorTest:testRequestOrder(uint128) (runs: 518, μ: 253696, ~: 259604)
 TransferRestrictorTest:testRestrictUnrestrict(address) (runs: 518, μ: 36984, ~: 36977)