Add signature validator tests

contracts/tec/test/utils/index.ts

@@ -1 +1,3 @@
 export { approvalHashUtils } from './approval_hash';
+export { TECTransactionFactory } from './tec_transaction_factory';
+export * from './types';

contracts/tec/test/utils/tec_transaction_factory.ts

@@ -0,0 +1,31 @@
+import { TransactionFactory } from '@0x/contracts-test-utils';
+import { SignatureType, SignedZeroExTransaction } from '@0x/types';
+import * as ethUtil from 'ethereumjs-util';
+
+import { TECSignatureType } from './types';
+
+export class TECTransactionFactory extends TransactionFactory {
+    constructor(privateKey: Buffer, exchangeAddress: string) {
+        super(privateKey, exchangeAddress);
+    }
+    public newSignedTECTransaction(
+        data: string,
+        signatureType: TECSignatureType = TECSignatureType.EthSign,
+    ): SignedZeroExTransaction {
+        let exchangeSignatureType;
+        if (signatureType === TECSignatureType.EthSign) {
+            exchangeSignatureType = SignatureType.EthSign;
+        } else if (signatureType === TECSignatureType.EIP712) {
+            exchangeSignatureType = SignatureType.EIP712;
+        } else {
+            throw new Error(`Error: ${signatureType} not a valid signature type`);
+        }
+        const signedTransaction = super.newSignedTransaction(data, exchangeSignatureType);
+        const tecSignatureTypeByte = ethUtil.toBuffer(signatureType).toString('hex');
+        signedTransaction.signature = `${signedTransaction.signature.slice(
+            0,
+            signedTransaction.signature.length - 2,
+        )}${tecSignatureTypeByte}`;
+        return signedTransaction;
+    }
+}

contracts/tec/test/utils/types.ts

@@ -5,3 +5,10 @@ export interface TECApproval {
     transactionSignature: string;
     approvalExpirationTimeSeconds: BigNumber;
 }
+
+export enum TECSignatureType {
+    Illegal,
+    EIP712,
+    EthSign,
+    NSignatureTypes,
+}