test: use parallel mode by default

hardhat.config.ts

@@ -14,6 +14,8 @@ import { globSync } from "glob";
 import { TASK_COMPILE_SOLIDITY_GET_SOURCE_PATHS } from "hardhat/builtin-tasks/task-names";
 import { HardhatUserConfig, subtask } from "hardhat/config";
 
+import { mochaRootHooks } from "./test/setup";
+
 const config: HardhatUserConfig = {
   defaultNetwork: "hardhat",
   solidity: {
@@ -75,6 +77,9 @@ const config: HardhatUserConfig = {
       start: "echo Running tests...",
     },
   },
+  mocha: {
+    rootHooks: mochaRootHooks,
+  },
   warnings: {
     "@aragon/**/*": {
       default: "off",

package.json

@@ -16,7 +16,7 @@
     "lint:ts:fix": "pnpm lint:ts --fix",
     "lint": "pnpm lint:sol && pnpm lint:ts",
     "format": "prettier . --write --ignore-path .gitignore --ignore-path .prettierignore",
-    "test": "pnpm hardhat test",
+    "test": "pnpm hardhat test --parallel",
     "test:coverage": "pnpm hardhat coverage",
     "test:trace": "pnpm hardhat test --trace",
     "watch:test": "pnpm hardhat watch test",

test/utils/expect.ts → test/setup/assertion/revertedWithOZAccessControlError.ts

@@ -1,9 +1,8 @@
-import { Assertion, expect, util } from "chai";
-
 /**
  * Custom Chai assertions along with types should be defined in this file.
  * The file will be auto-included in the test suite by the chai setup, no need to import it.
  */
+import { Assertion, expect, util } from "chai";
 
 declare global {
   // eslint-disable-next-line @typescript-eslint/no-namespace

test/setup/index.ts

@@ -0,0 +1,12 @@
+import * as Mocha from "mocha";
+
+import "./assertion/revertedWithOZAccessControlError";
+
+/**
+ * This is used to add custom assertions to the Chai assertion library in the test suite when it's run in parallel mode.
+ */
+export const mochaRootHooks = {
+  beforeEach(done: Mocha.Done) {
+    done();
+  },
+};