test: verify metadata is stored in UnixFS

update test to check metadata (mode/mtime) is properly sent to API
and stored in UnixFS structure, retrievable via DAG API

Author: lidel

test/files.spec.ts

@@ -3,6 +3,7 @@
 import * as dagPB from '@ipld/dag-pb'
 import { expect } from 'aegir/chai'
 import { fromString as uint8ArrayFromString } from 'uint8arrays/from-string'
+import { UnixFS } from 'ipfs-unixfs'
 import { factory } from './utils/factory.js'
 import type { KuboRPCClient } from '../src/index.js'
 
@@ -19,23 +20,35 @@ describe('.add', function () {
 
   after(async function () { return f.clean() })
 
-  it('should ignore metadata until https://github.com/ipfs/go-ipfs/issues/6920 is implemented', async function () {
+  it('should send metadata when provided (affects CID) but not return it until issue #6920 is resolved', async function () {
     const data = uint8ArrayFromString('some data')
     const result = await ipfs.add(data, {
       // @ts-expect-error missing field
       mode: 0o600,
       mtime: {
         secs: 1000,
-        nsecs: 0
+        nsecs: 500
       }
     })
 
+    // Metadata is not returned in response yet (issue #6920)
     expect(result).to.not.have.property('mode')
     expect(result).to.not.have.property('mtime')
     expect(result).to.have.property('cid')
 
     const { cid } = result
     expect(cid).to.have.property('code', dagPB.code)
-    expect(cid.toString()).to.equal('QmVv4Wz46JaZJeH5PMV4LGbRiiMKEmszPYY3g6fjGnVXBS')
+    // CID is different because metadata is now properly sent to the API
+    expect(cid.toString()).to.equal('QmPDB1sHH2FNqwJm2A6747uf6JUZyEB2cnNFRPz2uzjoDZ')
+
+    // Verify metadata is stored in UnixFS structure via DAG API
+    const dagNode = await ipfs.dag.get(cid)
+    const pbData = dagNode.value.Data
+    const unixfs = UnixFS.unmarshal(pbData)
+
+    // Verify mode and mtime are stored
+    expect(unixfs.mode).to.equal(0o600)
+    expect(unixfs.mtime?.secs).to.equal(1000n)
+    expect(unixfs.mtime?.nsecs).to.equal(500)
   })
 })