Create erc721_test.sol

projects/DAPIO/tests/unit-tests/erc721_test.sol

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+pragma solidity ^0.8.0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/test/ERC721Test.sol";
+import "../smart-contracts/ethereum/erc721.sol";
+
+contract ERC721Test is ERC721Test {
+    ERC721 private erc721;
+
+    function setUp() public {
+        erc721 = new ERC721();
+    }
+
+    function testMint() public {
+        address alice = address(0x123);
+        uint256 tokenId = 1;
+        string memory tokenURI = "https://example.com/token/1";
+
+        erc721.mint(alice, tokenId, tokenURI);
+        assertEq(erc721.ownerOf(tokenId), alice);
+    }
+
+    function testTransfer() public {
+        address alice = address(0x123);
+        address bob = address(0x456);
+        uint256 tokenId = 1;
+
+        erc721.mint(alice, tokenId, "");
+        erc721.transfer(bob, tokenId);
+        assertEq(erc721.ownerOf(tokenId), bob);
+    }
+
+    function testApprove() public {
+        address alice = address(0x123);
+        address bob = address(0x456);
+        uint256 tokenId = 1;
+
+        erc721.mint(alice, tokenId, "");
+        erc721.approve(bob, tokenId);
+        assertEq(erc721.getApproved(tokenId), bob);
+    }
+}