Revert "[#198] test: Adopt `neotest` changes"

This reverts commit 17907f9457.

tests/alphabet_test.go

@@ -18,6 +18,11 @@ import (
 
 const alphabetPath = "../alphabet"
 
+// FIXME: delete after https://github.com/nspcc-dev/neo-go/issues/2297
+const singleValidatorWIF = "KxyjQ8eUa4FHt3Gvioyt1Wz29cTUrE4eTqX3yFSk1YFCsPL8uNsY"
+
+var committeeAcc, _ = wallet.NewAccountFromWIF(singleValidatorWIF)
+
 func deployAlphabetContract(t *testing.T, e *neotest.Executor, addrNetmap, addrProxy util.Uint160, name string, index, total int64) util.Uint160 {
 	c := neotest.CompileFile(t, e.CommitteeHash, alphabetPath, path.Join(alphabetPath, "config.yml"))
 
@@ -51,9 +56,7 @@ func newAlphabetInvoker(t *testing.T) (*neotest.Executor, *neotest.ContractInvok
 	deployProxyContract(t, e, ctrNetmap.Hash)
 	hash := deployAlphabetContract(t, e, ctrNetmap.Hash, ctrProxy.Hash, "Az", 0, 1)
 
-	alphabet := getAlphabetAcc(t, e)
-
-	setAlphabetRole(t, e, alphabet.PrivateKey().PublicKey().Bytes())
+	setAlphabetRole(t, e, committeeAcc.PrivateKey().PublicKey().Bytes())
 
 	return e, e.CommitteeInvoker(hash)
 }
@@ -63,9 +66,7 @@ func TestEmit(t *testing.T) {
 
 	const method = "emit"
 
-	alphabet := getAlphabetAcc(t, c.Executor)
-
-	cCommittee := c.WithSigners(neotest.NewSingleSigner(alphabet))
+	cCommittee := c.WithSigners(neotest.NewSingleSigner(committeeAcc))
 	cCommittee.InvokeFail(t, "no gas to emit", method)
 
 	transferNeoToContract(t, c)
@@ -141,10 +142,3 @@ func setAlphabetRole(t *testing.T, e *neotest.Executor, new []byte) {
 	// set committee as NeoFSAlphabet
 	designInvoker.Invoke(t, stackitem.Null{}, "designateAsRole", int64(noderoles.NeoFSAlphabet), []interface{}{new})
 }
-
-func getAlphabetAcc(t *testing.T, e *neotest.Executor) *wallet.Account {
-	multi, ok := e.Committee.(neotest.MultiSigner)
-	require.True(t, ok)
-
-	return multi.Single(0).Account()
-}