add failing tests

Author: chm-diederichs

test/manifest.js

@@ -1553,6 +1553,44 @@ test('manifest - persist if manifest is updated', async function (t) {
   }
 })
 
+test('manifest - writable', async function (t) {
+  const keyPair = crypto.keyPair()
+
+  const manifest = Verifier.createManifest({
+    quorum: 1,
+    signers: [
+      {
+        signature: 'ed25519',
+        publicKey: keyPair.publicKey
+      }
+    ]
+  })
+
+  const key = Verifier.manifestHash(manifest)
+  const core = await create(t, { compat: false, manifest })
+
+  t.alike(core.key, key)
+
+  t.absent(core.keyPair)
+  t.absent(core.writable)
+
+  const signature = b4a.alloc(32)
+  await t.exception(core.append('hello'))
+
+  t.is(core.length, 0)
+})
+
+test('manifest - invalid signature fails', async function (t) {
+  const core = await create(t, { compat: false })
+
+  t.ok(core.writable)
+
+  const signature = b4a.alloc(32)
+  await t.exception(core.append('hello', { signature }))
+
+  t.is(core.length, 0)
+})
+
 function createMultiManifest(signers, prologue = null) {
   return {
     hash: 'blake2b',