chore: import upstream snapshot with attribution

packages/js-sdk/tests/template/backgroundBuild.test.ts

@@ -0,0 +1,25 @@
+import { randomUUID } from 'node:crypto'
+import { expect, test } from 'vitest'
+import { Template, waitForTimeout } from '../../src'
+
+test('build template in background', async () => {
+  const template = Template()
+    .fromImage('ubuntu:22.04')
+    .skipCache()
+    .runCmd('sleep 5') // Add a delay to ensure build takes time
+    .setStartCmd('echo "Hello"', waitForTimeout(10_000))
+
+  const name = `e2b-test:v1-${randomUUID()}`
+
+  const buildInfo = await Template.buildInBackground(template, name, {
+    cpuCount: 1,
+    memoryMB: 1024,
+  })
+
+  // Should return quickly (within a few seconds), not wait for the full build
+  expect(buildInfo).toBeDefined()
+
+  // Verify the build is actually running
+  const status = await Template.getBuildStatus(buildInfo)
+  expect(status.status).toEqual('building')
+}, 10_000)