Remove SignatureBouncer from drafts

CHANGELOG.md

@@ -10,7 +10,8 @@
  * `Address.isContract`: switched from `extcodesize` to `extcodehash` for less gas usage. ([#1802](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1802))
  * `SafeMath`: added custom error messages support for `sub`, `div` and `mod` functions. `ERC20` and `ERC777` updated to throw custom errors on subtraction overflows. ([#1828](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/1828))
 
-### Bugfixes
+### Breaking changes in drafts:
+ * `SignatureBouncer` has been removed from the library, both to avoid confusions with the GSN Bouncers and `GSNBouncerSignature` and because the API was not very clear. ([#1879](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/1879))
 
 ## 2.3.0 (2019-05-27)
 

test/cryptography/ECDSA.test.js

@@ -14,6 +14,18 @@ contract('ECDSA', function ([_, other]) {
     this.ecdsa = await ECDSAMock.new();
   });
 
+  context('recover with invalid signature', function () {
+    it('with short signature', async function () {
+      expect(await this.ecdsa.recover(TEST_MESSAGE, '0x1234')).to.equal(ZERO_ADDRESS);
+    });
+
+    it('with long signature', async function () {
+      // eslint-disable-next-line max-len
+      expect(await this.ecdsa.recover(TEST_MESSAGE, '0x01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789'))
+        .to.equal(ZERO_ADDRESS);
+    });
+  });
+
   context('recover with valid signature', function () {
     context('with v0 signature', function () {
       // Signature generated outside ganache with method web3.eth.sign(signer, message)