tests: fix memory leaks (#2389)

packages/snjs/mocha/vaults/key-management.test.js

@@ -8,11 +8,6 @@ describe('vault key management', function () {
 
   let context
 
-  afterEach(async function () {
-    await context.deinit()
-    localStorage.clear()
-  })
-
   beforeEach(async function () {
     localStorage.clear()
 
@@ -21,6 +16,12 @@ describe('vault key management', function () {
     await context.launch()
   })
 
+  afterEach(async function () {
+    await context.deinit()
+    localStorage.clear()
+    sinon.restore()
+  })
+
   describe('locking', () => {
     it('should throw if attempting to add item to locked vault', async () => {
       const vault = await context.vaults.createUserInputtedPasswordVault({