fix: macos test failures due to concurrent file access

- convert nedb file-based database setup to use in-memory databases when running
  in test mode
- remove the single process requirement for tests, run tests in parallel

Author: coopernetes

package-lock.json

@@ -13,7 +13,13 @@ if (!fs.existsSync('./.data')) fs.mkdirSync('./.data');
 /* istanbul ignore if */
 if (!fs.existsSync('./.data/db')) fs.mkdirSync('./.data/db');
 
-const db = new Datastore({ filename: './.data/db/pushes.db', autoload: true });
+// export for testing purposes
+export let db: Datastore;
+if (process.env.NODE_ENV === 'test') {
+  db = new Datastore({ inMemoryOnly: true, autoload: true });
+} else {
+  db = new Datastore({ filename: './.data/db/pushes.db', autoload: true });
+}
 try {
   db.ensureIndex({ fieldName: 'id', unique: true });
 } catch (e) {

src/db/file/pushes.ts

@@ -14,8 +14,12 @@ if (!fs.existsSync('./.data')) fs.mkdirSync('./.data');
 if (!fs.existsSync('./.data/db')) fs.mkdirSync('./.data/db');
 
 // export for testing purposes
-export const db = new Datastore({ filename: './.data/db/repos.db', autoload: true });
-
+export let db: Datastore;
+if (process.env.NODE_ENV === 'test') {
+  db = new Datastore({ inMemoryOnly: true, autoload: true });
+} else {
+  db = new Datastore({ filename: './.data/db/pushes.db', autoload: true });
+}
 try {
   db.ensureIndex({ fieldName: 'url', unique: true });
 } catch (e) {

src/db/file/repo.ts

@@ -11,7 +11,13 @@ if (!fs.existsSync('./.data')) fs.mkdirSync('./.data');
 /* istanbul ignore if */
 if (!fs.existsSync('./.data/db')) fs.mkdirSync('./.data/db');
 
-const db = new Datastore({ filename: './.data/db/users.db', autoload: true });
+// export for testing purposes
+export let db: Datastore;
+if (process.env.NODE_ENV === 'test') {
+  db = new Datastore({ inMemoryOnly: true, autoload: true });
+} else {
+  db = new Datastore({ filename: './.data/db/pushes.db', autoload: true });
+}
 
 // Using a unique constraint with the index
 try {

src/db/file/users.ts

@@ -2,12 +2,6 @@ import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
   test: {
-    pool: 'forks',
-    poolOptions: {
-      forks: {
-        singleFork: true, // Run all tests in a single process
-      },
-    },
     coverage: {
       provider: 'v8',
       reportsDirectory: './coverage',