Add test fixtures for previousProof Array & string missing.

suites/verify.js

@@ -36,29 +36,43 @@ export function runDataIntegrityProofVerifyTests({
       await verificationSuccess({
         credential: credentials.clone('previousProofString'),
         verifier,
-        reason: 'Should verify VC with a string "proof.previousProof"'
+        reason: 'Should verify VC with a string "proof.previousProof".'
       });
       await verificationSuccess({
         credential: credentials.clone('previousProofArray'),
         verifier,
-        reason: 'Should verify VC with an Array "proof.previousProof"'
+        reason: 'Should verify VC with an Array "proof.previousProof".'
       });
     });
-    it('If an unordered list (proof.previousProof), all referenced proofs in ' +
+    it('If an unordered list (proof), all referenced proofs in ' +
     'the array MUST verify.', async function() {
       this.test.link = 'https://w3c.github.io/vc-data-integrity/#proofs:~:text=If%20an%20unordered%20list%2C%20all%20referenced%20proofs%20in%20the%20array%20MUST%20verify';
-
+      await verificationSuccess({
+        credential: credentials.clone('proofSet'),
+        verifier,
+        reason: 'Should verify VC with multiple proofs.'
+      });
     });
     it('If a proof with id equal to previousProof does not exist in ' +
     'allProofs, an error MUST be raised and SHOULD convey an error type ' +
     'of PROOF_GENERATION_ERROR.', async function() {
       this.test.link = 'https://w3c.github.io/vc-data-integrity/#proofs:~:text=If%20a%20proof%20with%20id%20equal%20to%20previousProof%20does%20not%20exist%20in%20allProofs%2C%20an%20error%20MUST%20be%20raised%20and%20SHOULD%20convey%20an%20error%20type%20of%20PROOF_GENERATION_ERROR.';
+      await verificationFail({
+        credential: credentials.clone('missingPreviousProofString'),
+        verifier,
+        reason: 'Should not verify VC with invalid "proof.previousProof".'
+      });
     });
     it('If any element of previousProof list has an id attribute that does ' +
     'not match the id attribute of any element of allProofs, an error MUST ' +
     'be raised and SHOULD convey an error type of PROOF_GENERATION_ERROR.',
     async function() {
       this.test.link = 'https://w3c.github.io/vc-data-integrity/#proofs:~:text=If%20any%20element%20of%20previousProof%20list%20has%20an%20id%20attribute%20that%20does%20not%20match%20the%20id%20attribute%20of%20any%20element%20of%20allProofs%2C%20an%20error%20MUST%20be%20raised%20and%20SHOULD%20convey%20an%20error%20type%20of%20PROOF_GENERATION_ERROR.';
+      await verificationFail({
+        credential: credentials.clone('missingPreviousProofArray'),
+        verifier,
+        reason: 'Should not verify VC with invalid "proof.previousProof".'
+      });
     });
     it('When deserializing to RDF, implementations MUST ensure that the ' +
         'base URL is set to null.', async function() {