CreateERC1155ForZRXSignedTestOrder creates a valid 0x orders where the maker wishes to trade an ERC1155 for ZRX.

CreateNFTForZRXSignedTestOrder creates a valid 0x orders where the maker wishes to trade an NFT for ZRX.

CreateSignedTestOrderWithExpirationTime creates a valid 0x orders where the maker wishes to trade ZRX for WETH.

CreateWETHForZRXSignedTestOrder creates a valid 0x orders where the maker wishes to trade WETH for ZRX.

CreateZRXForWETHSignedTestOrder creates a valid 0x orders where the maker wishes to trade ZRX for WETH.

GetTestSignerFn returns a test signer function that can be used to sign Ethereum transactions.