test: migrate unit tests to vitest (#637)

* test: migrate unit tests to vitest

* fix: downgrade vitest to 3.x for Node 18 CI compatibility

* fix: pin vite to 5.x for Node 18 CI compatibility

* fix: use vitest 2.x and pin vite 5.x for Node 18 compatibility

vitest 3.x/4.x pulls in vite 7.x which requires Node >=20.
Also allowlists esbuild CORS advisory (GHSA-67mh-4wv8-2f99) from
vitest>vite>esbuild — dev-only, does not affect SDK runtime.

* chore: upgrade vitest to 4.x for Node 24

Now that CI targets Node 24, use latest vitest without Node 18 workarounds.
Removes vite 5.x resolution pin and esbuild advisory allowlist entry.
Scopes vitest to unit tests only via include pattern.

* fix: use glob patterns in vitest include for workspace compatibility

* fix: increase vitest timeout to 30s for RPC-dependent tests

Author: douglance

package.json

@@ -50,6 +50,7 @@
     "typechain": "7.0.0",
     "typescript": "^5.7.2",
     "viem": "^2.0.0",
+    "vitest": "^4.1.1",
     "yargs": "^17.3.1"
   },
   "resolutions": {

packages/ethers-viem-compat/package.json

@@ -24,7 +24,7 @@
   ],
   "scripts": {
     "build": "rm -rf dist && tsc -p tsconfig.json",
-    "test:unit": "mocha -r ts-node/register 'tests/**/*.test.ts'",
+    "test:unit": "vitest run --config ../../vitest.config.ts tests",
     "lint": "eslint .",
     "format": "prettier './**/*.{js,json,md,ts,yml}' '!./src/lib/abi' --write && yarn run lint --fix"
   },

packages/sdk/package.json

@@ -36,7 +36,7 @@
     "test:coverage": "nyc mocha",
     "test:fork": "SHOULD_FORK=1 hardhat test tests/fork/*.test.ts",
     "test:integration": "mocha tests/integration/ --timeout 30000000 --bail",
-    "test:unit": "mocha --parallel tests/unit/ --timeout 30000 --bail",
+    "test:unit": "vitest run --config ../../vitest.config.ts tests/unit",
     "test:ci": "nyc --reporter=lcovonly mocha --reporter xunit",
     "lint": "eslint .",
     "format": "prettier './**/*.{js,json,md,ts,yml}' '!./src/lib/abi' --write && yarn run lint --fix",

vitest.config.ts

@@ -0,0 +1,11 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    globals: true,
+    include: ['**/tests/unit/**/*.test.ts', '**/tests/*.test.ts'],
+    exclude: ['**/node_modules/**', '**/dist/**'],
+    testTimeout: 30_000,
+  },
+})