3 files changed, 29 insertions, 8 deletions
diff --git a/packages/server/src/helpers/decodeAttestationObject.ts b/packages/server/src/helpers/decodeAttestationObject.ts
index 8cf036d..ebfe42b 100644
--- a/packages/server/src/helpers/decodeAttestationObject.ts
+++ b/packages/server/src/helpers/decodeAttestationObject.ts
@@ -8,7 +8,9 @@ import { isoCBOR } from "./iso/index.ts";
 export function decodeAttestationObject(
   attestationObject: Uint8Array,
 ): AttestationObject {
-  return isoCBOR.decodeFirst<AttestationObject>(attestationObject);
+  return _decodeAttestationObjectInternals.stubThis(
+    isoCBOR.decodeFirst<AttestationObject>(attestationObject),
+  );
 }
 
 export type AttestationFormat =
@@ -41,3 +43,8 @@ export type AttestationStatement = {
   // `Map` properties
   readonly size: number;
 };
+
+// Make it possible to stub the return value during testing
+export const _decodeAttestationObjectInternals = {
+  stubThis: (value: AttestationObject) => value,
+};
diff --git a/packages/server/src/helpers/decodeCredentialPublicKey.ts b/packages/server/src/helpers/decodeCredentialPublicKey.ts
index b6d0f21..bb5dab4 100644
--- a/packages/server/src/helpers/decodeCredentialPublicKey.ts
+++ b/packages/server/src/helpers/decodeCredentialPublicKey.ts
@@ -4,5 +4,12 @@ import { isoCBOR } from "./iso/index.ts";
 export function decodeCredentialPublicKey(
   publicKey: Uint8Array,
 ): COSEPublicKey {
-  return isoCBOR.decodeFirst<COSEPublicKey>(publicKey);
+  return _decodeCredentialPublicKeyInternals.stubThis(
+    isoCBOR.decodeFirst<COSEPublicKey>(publicKey),
+  );
 }
+
+// Make it possible to stub the return value during testing
+export const _decodeCredentialPublicKeyInternals = {
+  stubThis: (value: COSEPublicKey) => value,
+};
diff --git a/packages/server/src/helpers/verifySignature.ts b/packages/server/src/helpers/verifySignature.ts
index 613436b..593c2e4 100644
--- a/packages/server/src/helpers/verifySignature.ts
+++ b/packages/server/src/helpers/verifySignature.ts
@@ -39,10 +39,17 @@ export function verifySignature(opts: {
     cosePublicKey = convertX509PublicKeyToCOSE(x509Certificate);
   }
 
-  return isoCrypto.verify({
-    cosePublicKey,
-    signature,
-    data,
-    shaHashOverride: hashAlgorithm,
-  });
+  return _verifySignatureInternals.stubThis(
+    isoCrypto.verify({
+      cosePublicKey,
+      signature,
+      data,
+      shaHashOverride: hashAlgorithm,
+    }),
+  );
 }
+
+// Make it possible to stub the return value during testing
+export const _verifySignatureInternals = {
+  stubThis: (value: Promise<boolean>) => value,
+};