# Test Coverage

The tables below provide a summary and detailed information in relation to the number of tests performed, the count of passing tests and the count of failing tests.

To summarise, VeChain is fully compatible with OpenZeppelin contracts (with v5 being the latest version tested), and the main differences encountered are related to Hardhat:

* The `chainId` in VeChain is the genesis block ID of each network
* Custom [Hardhat RPC methods](https://hardhat.org/hardhat-network/docs/reference#special-testing/debugging-methods) like `evm_increaseTime` or `evm_mine` depend on the actual Hardhat VeChain plugin (so differences might be expected in this regard).

You can find detailed analysis of the coverage categories in the pages to follow.

## OpenZeppelin v5

### Summary

<table><thead><tr><th width="271">Category</th><th width="394">Short Description</th><th>Failures</th></tr></thead><tbody><tr><td>Set base URI</td><td>URI was not set in the ERC721 and ERC721Enumerable test cases, causing 6 tests to remain pending. Since these tests focus on compatibility, URI validation is not essential.</td><td>0</td></tr></tbody></table>

### Detail

<table><thead><tr><th width="306">Contract Name</th><th>Pass</th><th>Fail</th><th>Total</th><th data-hidden>Test Coverage</th></tr></thead><tbody><tr><td><strong>Total</strong></td><td><strong>2611</strong></td><td><strong>0</strong></td><td><strong>2617</strong></td><td></td></tr><tr><td>AccessControl</td><td>30</td><td>0</td><td>30</td><td></td></tr><tr><td>Ownable</td><td>8</td><td>0</td><td>8</td><td></td></tr><tr><td>Ownable2Step</td><td>6</td><td>0</td><td>6</td><td></td></tr><tr><td>AccessControlDefaultAdminRules</td><td>56</td><td>0</td><td>56</td><td></td></tr><tr><td>AccessControlEnumerable</td><td>36</td><td>0</td><td>36</td><td></td></tr><tr><td>AccessManaged</td><td>8</td><td>0</td><td>8</td><td></td></tr><tr><td>AccessManager</td><td>113</td><td>0</td><td>113</td><td></td></tr><tr><td>AuthorityUtils</td><td>4</td><td>0</td><td>4</td><td></td></tr><tr><td>VestingWallet</td><td>2</td><td>0</td><td>2</td><td></td></tr><tr><td>Governor</td><td>136</td><td>0</td><td>136</td><td></td></tr><tr><td>GovernorERC721</td><td>2</td><td>0</td><td>2</td><td></td></tr><tr><td>GovernorPreventLateQuorum</td><td>5</td><td>0</td><td>5</td><td></td></tr><tr><td>GovernorStorage</td><td>3</td><td>0</td><td>3</td><td></td></tr><tr><td>GovernorTimelockAccess</td><td>3</td><td>0</td><td>3</td><td></td></tr><tr><td>GovernorTimelockCompound</td><td>8</td><td>0</td><td>8</td><td></td></tr><tr><td>GovernorTimelockControl</td><td>12</td><td>0</td><td>12</td><td></td></tr><tr><td>GovernorVotesQuorumFraction</td><td>4</td><td>0</td><td>4</td><td></td></tr><tr><td>GovernorWithParams</td><td>7</td><td>0</td><td>7</td><td></td></tr><tr><td>Votes</td><td>44</td><td>0</td><td>44</td><td></td></tr><tr><td>ERC2771Context</td><td>11</td><td>0</td><td>11</td><td></td></tr><tr><td>ERC2771Forwarder</td><td>36</td><td>0</td><td>36</td><td></td></tr><tr><td>Clones</td><td>30</td><td>0</td><td>30</td><td></td></tr><tr><td>ERC1967Proxy</td><td>19</td><td>0</td><td>19</td><td></td></tr><tr><td>BeaconProxy</td><td>6</td><td>0</td><td>6</td><td></td></tr><tr><td>UpgradeableBeacon</td><td>6</td><td>0</td><td>6</td><td></td></tr><tr><td>ProxyAdmin</td><td>5</td><td>0</td><td>5</td><td></td></tr><tr><td>TransparentUpgradeableProxy</td><td>19</td><td>0</td><td>19</td><td></td></tr><tr><td>Initializable</td><td>29</td><td>0</td><td>29</td><td></td></tr><tr><td>UUPSupgradeable</td><td>8</td><td>0</td><td>8</td><td></td></tr><tr><td>ERC721</td><td>375</td><td>0</td><td>378</td><td></td></tr><tr><td>ERC721Enumerable</td><td>397</td><td>0</td><td>400</td><td></td></tr><tr><td>ERC721Wrapper</td><td>18</td><td>0</td><td>18</td><td></td></tr><tr><td>ERC721Holder</td><td>1</td><td>0</td><td>1</td><td></td></tr><tr><td>ERC721Burnable</td><td>5</td><td>0</td><td>5</td><td></td></tr><tr><td>ERC721Consecutive</td><td>34</td><td>0</td><td>34</td><td></td></tr><tr><td>ERC721Pausable</td><td>9</td><td>0</td><td>9</td><td></td></tr><tr><td>ERC721Royalty</td><td>16</td><td>0</td><td>16</td><td></td></tr><tr><td>ERC721URIStorage</td><td>17</td><td>0</td><td>17</td><td></td></tr><tr><td>ERC721Votes</td><td>23</td><td>0</td><td>23</td><td></td></tr><tr><td>ERC721Holder</td><td>1</td><td>0</td><td>1</td><td></td></tr><tr><td>ERC1155</td><td>89</td><td>0</td><td>89</td><td></td></tr><tr><td>ERC1155Burnable</td><td>6</td><td>0</td><td>6</td><td></td></tr><tr><td>ERC1155Pausable</td><td>11</td><td>0</td><td>11</td><td></td></tr><tr><td>ERC1155Supply</td><td>4</td><td>0</td><td>4</td><td></td></tr><tr><td>ERC1155URIStorage</td><td>4</td><td>0</td><td>4</td><td></td></tr><tr><td>ERC1155Holder</td><td>7</td><td>0</td><td>7</td><td></td></tr><tr><td>Address</td><td>7</td><td>0</td><td>7</td><td></td></tr><tr><td>Address</td><td>29</td><td>0</td><td>29</td><td></td></tr><tr><td>Arrays</td><td>20</td><td>0</td><td>20</td><td></td></tr><tr><td>Base64</td><td>5</td><td>0</td><td>5</td><td></td></tr><tr><td>Context</td><td>4</td><td>0</td><td>4</td><td></td></tr><tr><td>Create2</td><td>8</td><td>0</td><td>8</td><td></td></tr><tr><td>Multicall</td><td>4</td><td>0</td><td>4</td><td></td></tr><tr><td>Nonces</td><td>6</td><td>0</td><td>6</td><td></td></tr><tr><td>Pausable</td><td>11</td><td>0</td><td>11</td><td></td></tr><tr><td>ReentrancyGuard</td><td>6</td><td>0</td><td>6</td><td></td></tr><tr><td>ShortStrings</td><td>14</td><td>0</td><td>14</td><td></td></tr><tr><td>StorageSlot</td><td>24</td><td>0</td><td>24</td><td></td></tr><tr><td>Strings</td><td>71</td><td>0</td><td>71</td><td></td></tr><tr><td>ECDSA</td><td>14</td><td>0</td><td>14</td><td></td></tr><tr><td>EIP712</td><td>13</td><td>0</td><td>13</td><td></td></tr><tr><td>MerkleProof</td><td>10</td><td>0</td><td>10</td><td></td></tr><tr><td>MessageHashUtils</td><td>4</td><td>0</td><td>4</td><td></td></tr><tr><td>ERC165</td><td>5</td><td>0</td><td>5</td><td></td></tr><tr><td>ERC165Checker</td><td>40</td><td>0</td><td>40</td><td></td></tr><tr><td>Math</td><td>44</td><td>0</td><td>44</td><td></td></tr><tr><td>SafeCast</td><td>444</td><td>0</td><td>444</td><td></td></tr><tr><td>SignedMath</td><td>12</td><td>0</td><td>12</td><td></td></tr><tr><td>BitMap</td><td>10</td><td>0</td><td>10</td><td></td></tr><tr><td>Checkpoints</td><td>33</td><td>0</td><td>33</td><td></td></tr><tr><td>DoubleEndedQueue</td><td>9</td><td>0</td><td>9</td><td></td></tr><tr><td>EnumerableMap</td><td>60</td><td>0</td><td>60</td><td></td></tr><tr><td>EnumerableSet</td><td>24</td><td>0</td><td>24</td><td></td></tr><tr><td>Time</td><td>7</td><td>0</td><td>7</td><td></td></tr></tbody></table>

## OpenZeppelin v4

### Summary

<table><thead><tr><th width="305">Category</th><th width="359">Short Description</th><th>Failures</th></tr></thead><tbody><tr><td>Justifiable</td><td>Failures that result from the inherent design differences between VeChain and Ethereum.</td><td>73</td></tr><tr><td>Contract Address Prediction</td><td>See <a href="https://github.com/vechain/vechain-docs/blob/main/core-concepts/evm-compatibility/test-coverage/broken-reference/README.md">here</a>.</td><td>14</td></tr><tr><td>Failures in Constructor</td><td>Contract fails in constructor, resulting in failure to be deployed.</td><td>7</td></tr><tr><td>Full, with eth_sign implementation</td><td>See <a href="https://github.com/vechain/vechain-docs/blob/main/core-concepts/evm-compatibility/test-coverage/broken-reference/README.md">here</a>.</td><td>4</td></tr><tr><td>Full, with test changes</td><td>Some test modifications had to be added for the tests to pass.</td><td>3</td></tr><tr><td>BadBeaconProxy Address 0x1</td><td>See <a href="https://github.com/vechain/vechain-docs/blob/main/core-concepts/evm-compatibility/test-coverage/broken-reference/README.md">here</a>.</td><td>1</td></tr></tbody></table>

### Detail

<table><thead><tr><th width="305">Contract Name</th><th>Pass</th><th>Fail</th><th>Total</th><th data-hidden>Test Coverage</th><th data-hidden>Hardhat Total Tests</th></tr></thead><tbody><tr><td><strong>Total</strong></td><td><strong>2324</strong></td><td><strong>102</strong></td><td><strong>2426</strong></td><td></td><td><strong>2667</strong></td></tr><tr><td>ERC1967Proxy</td><td>25</td><td>3</td><td>28</td><td></td><td>28</td></tr><tr><td>TransparentUpgradeableProxy</td><td>58</td><td>3</td><td>61</td><td></td><td>61</td></tr><tr><td>BeaconProxy</td><td>7</td><td>2</td><td>9</td><td></td><td>9</td></tr><tr><td>GovernorTimelockCompound</td><td>7</td><td>12</td><td>19</td><td></td><td>19</td></tr><tr><td>GovernorCompatibilityBravo</td><td>7</td><td>2</td><td>9</td><td></td><td>9</td></tr><tr><td>TimelockController</td><td>27</td><td>15</td><td>42</td><td></td><td>48</td></tr><tr><td>CrossChainEnabled</td><td>4</td><td>9</td><td>13</td><td></td><td>15</td></tr><tr><td>GovernorTimelockControl</td><td>12</td><td>9</td><td>21</td><td></td><td>21</td></tr><tr><td>AccessControl</td><td>50</td><td>4</td><td>54</td><td></td><td>80</td></tr><tr><td>MinimalForwarder</td><td>12</td><td>4</td><td>16</td><td></td><td>15</td></tr><tr><td>TokenTimelock</td><td>3</td><td>4</td><td>7</td><td></td><td>7</td></tr><tr><td>VestingWallet</td><td>2</td><td>4</td><td>6</td><td></td><td>6</td></tr><tr><td>ERC721Enumerable</td><td>233</td><td>3</td><td>236</td><td></td><td>236</td></tr><tr><td>DoubleEndedQueue</td><td>7</td><td>2</td><td>9</td><td></td><td>9</td></tr><tr><td>ERC2771Context</td><td>5</td><td>2</td><td>7</td><td></td><td>7</td></tr><tr><td>ERC721</td><td>211</td><td>2</td><td>213</td><td></td><td>213</td></tr><tr><td>Governor</td><td>42</td><td>2</td><td>44</td><td></td><td>44</td></tr><tr><td>Checkpoints</td><td>22</td><td>1</td><td>23</td><td></td><td>23</td></tr><tr><td>ERC1155</td><td>83</td><td>1</td><td>84</td><td></td><td>84</td></tr><tr><td>ERC1155Holder</td><td>4</td><td>1</td><td>5</td><td></td><td>5</td></tr><tr><td>ERC1155PresetMinterPauser</td><td>16</td><td>1</td><td>17</td><td></td><td>17</td></tr><tr><td>ERC165</td><td>2</td><td>1</td><td>3</td><td></td><td>3</td></tr><tr><td>ERC165Storage</td><td>4</td><td>1</td><td>5</td><td></td><td>5</td></tr><tr><td>ERC20Votes</td><td>28</td><td>1</td><td>29</td><td></td><td>29</td></tr><tr><td>ERC20VotesComp</td><td>27</td><td>1</td><td>28</td><td></td><td>28</td></tr><tr><td>ERC721PresetMinterPauserAutoId</td><td>15</td><td>1</td><td>16</td><td></td><td>16</td></tr><tr><td>ERC721Royalty</td><td>13</td><td>1</td><td>14</td><td></td><td>14</td></tr><tr><td>GovernorWithParams</td><td>3</td><td>1</td><td>4</td><td></td><td>4</td></tr><tr><td>MerkleProof</td><td>8</td><td>1</td><td>9</td><td></td><td>9</td></tr><tr><td>TimersTimestamp</td><td>4</td><td>1</td><td>5</td><td></td><td>5</td></tr><tr><td>ECDSA</td><td>14</td><td>3</td><td>17</td><td></td><td>17</td></tr><tr><td>SignatureChecker (ERC1271)</td><td>1</td><td>1</td><td>1</td><td></td><td>7</td></tr><tr><td>ERC1820Implementer</td><td>1</td><td>1</td><td>1</td><td></td><td>6</td></tr><tr><td>ERC777</td><td>1</td><td>1</td><td>1</td><td></td><td>193</td></tr><tr><td>ERC777PresetFixedSupply</td><td>1</td><td>1</td><td>1</td><td></td><td>6</td></tr><tr><td>Address</td><td>29</td><td>0</td><td>29</td><td></td><td>29</td></tr><tr><td>Arrays</td><td>15</td><td>0</td><td>15</td><td></td><td>15</td></tr><tr><td>BitMap</td><td>10</td><td>0</td><td>10</td><td></td><td>10</td></tr><tr><td>Clones</td><td>30</td><td>0</td><td>30</td><td></td><td>30</td></tr><tr><td>ConditionalEscrow</td><td>11</td><td>0</td><td>11</td><td></td><td>11</td></tr><tr><td>Context</td><td>4</td><td>0</td><td>4</td><td></td><td>4</td></tr><tr><td>Counters</td><td>8</td><td>0</td><td>8</td><td></td><td>8</td></tr><tr><td>Create2</td><td>8</td><td>0</td><td>8</td><td></td><td>8</td></tr><tr><td>EIP712</td><td>2</td><td>0</td><td>2</td><td></td><td>2</td></tr><tr><td>EnumerableMap</td><td>70</td><td>0</td><td>70</td><td></td><td>70</td></tr><tr><td>EnumerableSet</td><td>20</td><td>0</td><td>24</td><td></td><td>24</td></tr><tr><td>ERC1155Burnable</td><td>6</td><td>0</td><td>6</td><td></td><td>6</td></tr><tr><td>ERC1155Pausable</td><td>11</td><td>0</td><td>11</td><td></td><td>11</td></tr><tr><td>ERC1155Supply</td><td>10</td><td>0</td><td>10</td><td></td><td>10</td></tr><tr><td>ERC1155URIStorage</td><td>4</td><td>0</td><td>4</td><td></td><td>4</td></tr><tr><td>ERC165Checker</td><td>40</td><td>0</td><td>40</td><td></td><td>40</td></tr><tr><td>ERC20</td><td>118</td><td>0</td><td>118</td><td></td><td>118</td></tr><tr><td>ERC20Burnable</td><td>13</td><td>0</td><td>13</td><td></td><td>13</td></tr><tr><td>ERC20Capped</td><td>5</td><td>0</td><td>5</td><td></td><td>5</td></tr><tr><td>ERC20FlashMint</td><td>12</td><td>0</td><td>12</td><td></td><td>12</td></tr><tr><td>ERC20Pausable</td><td>12</td><td>0</td><td>12</td><td></td><td>12</td></tr><tr><td>ERC20Permit</td><td>6</td><td>0</td><td>6</td><td></td><td>6</td></tr><tr><td>ERC20PresetFixedSupply</td><td>4</td><td>0</td><td>4</td><td></td><td>4</td></tr><tr><td>ERC20PresetMinterPauser</td><td>12</td><td>0</td><td>12</td><td></td><td>12</td></tr><tr><td>ERC20Snapshot</td><td>14</td><td>0</td><td>14</td><td></td><td>14</td></tr><tr><td>ERC4626</td><td>25</td><td>0</td><td>25</td><td></td><td>25</td></tr><tr><td>ERC721Burnable</td><td>4</td><td>0</td><td>4</td><td></td><td>4</td></tr><tr><td>ERC721Consecutive</td><td>13</td><td>0</td><td>13</td><td></td><td>13</td></tr><tr><td>ERC721Holder</td><td>1</td><td>0</td><td>1</td><td></td><td>1</td></tr><tr><td>ERC721Pausable</td><td>10</td><td>0</td><td>10</td><td></td><td>10</td></tr><tr><td>ERC721URIStorage</td><td>10</td><td>0</td><td>10</td><td></td><td>10</td></tr><tr><td>ERC721Votes</td><td>26</td><td>0</td><td>26</td><td></td><td>26</td></tr><tr><td>Escrow</td><td>10</td><td>0</td><td>10</td><td></td><td>10</td></tr><tr><td>GovernorComp</td><td>2</td><td>0</td><td>2</td><td></td><td>2</td></tr><tr><td>GovernorERC721Mock</td><td>2</td><td>0</td><td>2</td><td></td><td>2</td></tr><tr><td>GovernorPreventLateQuorum</td><td>5</td><td>0</td><td>5</td><td></td><td>5</td></tr><tr><td>GovernorVotesQuorumFraction</td><td>6</td><td>0</td><td>6</td><td></td><td>6</td></tr><tr><td>Initializable</td><td>29</td><td>0</td><td>29</td><td></td><td>29</td></tr><tr><td>Math</td><td>25</td><td>0</td><td>25</td><td></td><td>25</td></tr><tr><td>MulticallToken</td><td>4</td><td>0</td><td>4</td><td></td><td>4</td></tr><tr><td>Ownable</td><td>6</td><td>0</td><td>6</td><td></td><td>6</td></tr><tr><td>Ownable2Step</td><td>5</td><td>0</td><td>5</td><td></td><td>5</td></tr><tr><td>Pausable</td><td>11</td><td>0</td><td>11</td><td></td><td>11</td></tr><tr><td>PaymentSplitter</td><td>20</td><td>0</td><td>20</td><td></td><td>20</td></tr><tr><td>ProxyAdmin</td><td>12</td><td>0</td><td>12</td><td></td><td>12</td></tr><tr><td>PullPayment</td><td>4</td><td>0</td><td>4</td><td></td><td>4</td></tr><tr><td>ReentrancyGuard</td><td>6</td><td>0</td><td>6</td><td></td><td>6</td></tr><tr><td>RefundEscrow</td><td>17</td><td>0</td><td>17</td><td></td><td>17</td></tr><tr><td>SafeCast</td><td>444</td><td>0</td><td>444</td><td></td><td>444</td></tr><tr><td>SafeERC20</td><td>35</td><td>0</td><td>35</td><td></td><td>35</td></tr><tr><td>SafeMath</td><td>48</td><td>0</td><td>48</td><td></td><td>48</td></tr><tr><td>SignedMath</td><td>12</td><td>0</td><td>12</td><td></td><td>12</td></tr><tr><td>SignedSafeMath</td><td>17</td><td>0</td><td>17</td><td></td><td>17</td></tr><tr><td>StorageSlot</td><td>12</td><td>0</td><td>12</td><td></td><td>12</td></tr><tr><td>Strings</td><td>31</td><td>0</td><td>31</td><td></td><td>31</td></tr><tr><td>TimersBlockNumber</td><td>5</td><td>0</td><td>5</td><td></td><td>5</td></tr><tr><td>UpgradeableBeacon</td><td>5</td><td>0</td><td>5</td><td></td><td>5</td></tr><tr><td>UUPSUpgradeable</td><td>6</td><td>0</td><td>6</td><td></td><td>6</td></tr><tr><td>Votes</td><td>23</td><td>0</td><td>23</td><td></td><td>23</td></tr></tbody></table>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.vechain.org/core-concepts/evm-compatibility/test-coverage.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.