[FAB-13167] IdemixBridgeTest Robustification

This change-set updates the tests to always
correctly invalidate a credential in a bad path test.

Change-Id: I3a0eda33bf1158d7a1cf8a3ddd7dc4c4af5548dd
Signed-off-by: Angelo De Caro <adc@zurich.ibm.com>

bccsp/idemix/bridge/bridge_test.go

@@ -849,7 +849,13 @@ var _ = Describe("Idemix Bridge", func() {
  })
 
  It("invalid credential", func() {
- credential[4] = 0
+ // Invalidate credential by changing it in one position
+ if credential[4] == 0 {
+ credential[4] = 1
+ } else {
+ credential[4] = 0
+ }
+
  // Verify Credential
  valid, err := CredentialVerifier.Verify(
  UserKey,