test code v1

tests/TC057-access-allowed.md

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+# Test Case: access - Allowed Operations
+
+**Test ID**: TC057-access-allowed
+**Category**: VFS Integration
+**Priority**: High
+
+## Objective
+
+Verify a non-root credential receives read and execute access allowed by the
+recorded mode bits on the read-only mount.
+
+## Procedure
+
+Mount vfs/vfs-plain.erofs and run with the native nobody credential:
+
+    su -m nobody -c './g3_vfs_probe expect-success access-read /tmp/repo22-g3/mnt/testdir/file.txt'
+    su -m nobody -c './g3_vfs_probe expect-success access-exec /tmp/repo22-g3/mnt/testdir'
+    su -m nobody -c './g3_vfs_probe expect-success access-exec /tmp/repo22-g3/mnt/testdir/script.sh'
+    su -m nobody -c './g3_vfs_probe expect-success open-read /tmp/repo22-g3/mnt/testdir/file.txt'
+
+## Expected Results
+
+All four direct checks report success with errno 0. Record the nobody uid,
+fixture modes, command output, and cleanup.