fix: port collisions in createTestContext (#1326)

- port workaround allows more performant parallel testing - testing on CI environments should still utilize Jest’s `—runInBand` flag
prisma-labs · Sep 16, 2020 · f059254 · f059254
1 parent f0129d2
commit f059254
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/testing/testing.ts b/src/testing/testing.ts
@@ -44,7 +44,8 @@ export async function createTestContext(opts?: CreateTestContextOptions): Promis
     await Layout.create({ entrypointPath: opts?.entrypointPath, projectRoot: opts?.projectRoot })
   )
   const pluginManifests = await PluginWorktime.getUsedPlugins(layout)
-  const randomPort = await getPort({ port: getPort.makeRange(4000, 6000) })
+  const randomStartPort = Math.floor(Math.random() * (6000 - 4000)) + 4000
+  const randomPort = await getPort({ port: getPort.makeRange(randomStartPort, 6000) })
   const privateApp = app as PrivateApp
 
   const forcedServerSettings = {