♻️ Add equivalence test for _wrapNFTId (#142)

Author: Vectorized

.gas-snapshot

@@ -145,27 +145,28 @@ DN404Test:test__codesize() (gas: 61620)
 DN404ZeroIndexedTest:testBatchNFTLog() (gas: 326053)
 DN404ZeroIndexedTest:testBurnOnTransfer(uint32,address) (runs: 270, μ: 255124, ~: 255124)
 DN404ZeroIndexedTest:testFnSelectorNotRecognized() (gas: 6268)
-DN404ZeroIndexedTest:testInitialize(uint32,address) (runs: 272, μ: 109068, ~: 113108)
+DN404ZeroIndexedTest:testInitialize(uint32,address) (runs: 272, μ: 109048, ~: 113108)
 DN404ZeroIndexedTest:testMintAndBurn() (gas: 343030)
-DN404ZeroIndexedTest:testMintAndBurn2() (gas: 280268)
+DN404ZeroIndexedTest:testMintAndBurn2() (gas: 280290)
 DN404ZeroIndexedTest:testMintNext() (gas: 701766)
-DN404ZeroIndexedTest:testMintNextContiguous(uint256) (runs: 272, μ: 559796, ~: 516666)
-DN404ZeroIndexedTest:testMintOnTransfer(uint32,address) (runs: 270, μ: 269705, ~: 269705)
-DN404ZeroIndexedTest:testMixed(bytes32) (runs: 272, μ: 577183, ~: 498226)
-DN404ZeroIndexedTest:testNameAndSymbol(string,string) (runs: 272, μ: 205773, ~: 206176)
+DN404ZeroIndexedTest:testMintNextContiguous(uint256) (runs: 272, μ: 568584, ~: 524801)
+DN404ZeroIndexedTest:testMintOnTransfer(uint32,address) (runs: 270, μ: 269727, ~: 269727)
+DN404ZeroIndexedTest:testMixed(bytes32) (runs: 272, μ: 564213, ~: 505534)
+DN404ZeroIndexedTest:testNameAndSymbol(string,string) (runs: 272, μ: 205728, ~: 206131)
 DN404ZeroIndexedTest:testNumAliasesOverflowReverts() (gas: 40944)
 DN404ZeroIndexedTest:testOwnedIds() (gas: 347336)
-DN404ZeroIndexedTest:testOwnedIds(uint256) (runs: 272, μ: 261162, ~: 284431)
-DN404ZeroIndexedTest:testPermit2() (gas: 455270)
-DN404ZeroIndexedTest:testRegisterAndResolveAlias(address,address) (runs: 272, μ: 120044, ~: 120191)
-DN404ZeroIndexedTest:testSetAndGetAux(address,uint88) (runs: 272, μ: 21987, ~: 22272)
+DN404ZeroIndexedTest:testOwnedIds(uint256) (runs: 272, μ: 263381, ~: 286216)
+DN404ZeroIndexedTest:testPermit2() (gas: 455292)
+DN404ZeroIndexedTest:testRegisterAndResolveAlias(address,address) (runs: 272, μ: 120191, ~: 120191)
+DN404ZeroIndexedTest:testSetAndGetAux(address,uint88) (runs: 272, μ: 22004, ~: 22289)
 DN404ZeroIndexedTest:testSetAndGetOperatorApprovals(address,address,bool) (runs: 272, μ: 129643, ~: 119840)
-DN404ZeroIndexedTest:testSetAndGetSkipNFT() (gas: 708368)
-DN404ZeroIndexedTest:testTokenURI(string,uint256) (runs: 272, μ: 156264, ~: 156411)
+DN404ZeroIndexedTest:testSetAndGetSkipNFT() (gas: 708390)
+DN404ZeroIndexedTest:testTokenURI(string,uint256) (runs: 272, μ: 156286, ~: 156433)
 DN404ZeroIndexedTest:testTransferWithMirrorEvent() (gas: 409821)
 DN404ZeroIndexedTest:testTransfersAndBurns() (gas: 485767)
-DN404ZeroIndexedTest:testWrapAround(uint32,uint256) (runs: 272, μ: 380944, ~: 388042)
-DN404ZeroIndexedTest:test__codesize() (gas: 61169)
+DN404ZeroIndexedTest:testWrapAround(uint32,uint256) (runs: 272, μ: 380053, ~: 387951)
+DN404ZeroIndexedTest:testWrapNFTIdEquivalence(uint256,uint256,bool) (runs: 272, μ: 1379, ~: 1418)
+DN404ZeroIndexedTest:test__codesize() (gas: 61415)
 DN420OnlyERC20Test:testApprove() (gas: 35770)
 DN420OnlyERC20Test:testApprove(address,uint256) (runs: 272, μ: 30882, ~: 31321)
 DN420OnlyERC20Test:testBurn() (gas: 49034)

test/DN404ZeroIndexed.t.sol

@@ -809,4 +809,40 @@ contract DN404ZeroIndexedTest is SoladyTest {
             }
         }
     }
+
+    function testWrapNFTIdEquivalence(uint256 id, uint256 idLimit, bool useOneIndexed) public {
+        id = _bound(id, 0, 0xffff);
+        idLimit = _bound(idLimit, 0, 0xff);
+        // if (useOneIndexed) while (id == 0) id = _random();
+        uint256 original = _wrapNFTIdOrigina(id, idLimit, useOneIndexed);
+        assertEq(_wrapNFTId(id, idLimit, useOneIndexed), original);
+    }
+
+    function _wrapNFTIdOrigina(uint256 id, uint256 idLimit, bool useOneIndexed)
+        internal
+        pure
+        returns (uint256)
+    {
+        if (useOneIndexed) {
+            return id <= idLimit ? id : 1;
+        } else {
+            return id < idLimit ? id : 0;
+        }
+    }
+
+    function _wrapNFTId(uint256 id, uint256 idLimit, bool useOneIndexed)
+        internal
+        pure
+        returns (uint256 result)
+    {
+        result = useOneIndexed ? 1 : 0;
+        /// @solidity memory-safe-assembly
+        assembly {
+            result :=
+                or(
+                    mul(or(mul(iszero(gt(id, idLimit)), id), gt(id, idLimit)), result),
+                    mul(mul(lt(id, idLimit), id), iszero(result))
+                )
+        }
+    }
 }