normalize tests a tiny bit

Author: mafintosh

test/basic.js

@@ -92,7 +92,7 @@ test(
 test('createIfMissing', async function (t) {
   const core = new Hypercore(RAM, { createIfMissing: false })
 
-  t.exception(core.ready())
+  await t.exception(core.ready())
 })
 
 test('reopen and overwrite', async function (t) {

test/replicate.js

@@ -600,8 +600,6 @@ test('one inflight request to a peer per block', async function (t) {
 })
 
 test('non-sparse replication', async function (t) {
-  t.plan(2)
-
   const a = await create()
   const b = await create(a.key, { sparse: false })
 
@@ -611,6 +609,8 @@ test('non-sparse replication', async function (t) {
 
   const download = t.test('download')
 
+  download.plan(6)
+
   let contiguousLength = 0
 
   b