CLDSRV-720: Fix file tests null version compat

Author: BourgoisMickael

.github/workflows/tests.yaml

@@ -392,9 +392,13 @@ jobs:
 
   file-ft-tests:
     strategy:
+      fail-fast: false
       matrix:
         include:
-          - job-name: file-ft-tests
+          - enable-null-compat: ''
+            job-name: file-ft-tests
+          - enable-null-compat: 'true'
+            job-name: file-ft-tests-null-compat
     name: ${{ matrix.job-name }}
     runs-on: ubuntu-24.04
     needs: build
@@ -404,6 +408,7 @@ jobs:
       CLOUDSERVER_IMAGE: ghcr.io/${{ github.repository }}:${{ github.sha }}
       MONGODB_IMAGE: ghcr.io/${{ github.repository }}/ci-mongodb:${{ github.sha }}
       MPU_TESTING: "yes"
+      ENABLE_NULL_VERSION_COMPAT_MODE: "${{ matrix.enable-null-compat }}"
       JOB_NAME: ${{ matrix.job-name }}
     steps:
     - name: Checkout

tests/functional/aws-node-sdk/test/utils/init.js

@@ -11,7 +11,8 @@ function decodeVersionId(versionId) {
     let decodedVersionId;
     if (versionId) {
         if (versionId === 'null') {
-            decodedVersionId = nonVersionedObjId;
+            // At least file backend handles both
+            decodedVersionId = config.enableNullVersionCompatMode ? nonVersionedObjId : 'null';
         } else {
             decodedVersionId = versionIdUtils.decode(versionId);
         }