[FAB-13351] Test Robustification

This change-set enhance the tests to make sure
that a credential is invalidate always successfuly.

Change-Id: Id6d11bc735f0b03a07e97e99a57ec41b4ea26bb8
Signed-off-by: Angelo De Caro <adc@zurich.ibm.com>
(cherry picked from commit 419397e)

Author: adecaro

bccsp/idemix/bridge/bridge_test.go

@@ -788,7 +788,11 @@ var _ = Describe("Idemix Bridge", func() {
 			})
 
 			It("invalid credential request in verifying credential", func() {
-				credRequest[4] = 0
+				if credRequest[4] == 0 {
+					credRequest[4] = 1
+				} else {
+					credRequest[4] = 0
+				}
 				credential, err := CredentialSigner.Sign(
 					IssuerKey,
 					credRequest,