Set _buildId for next.build()

Author: mischnic

test/lib/next-modes/next-start.ts

@@ -217,7 +217,7 @@ export class NextStartInstance extends NextInstance {
       )
     }
 
-    return new Promise<{
+    let result = await new Promise<{
       exitCode: NodeJS.Signals | number | null
       cliOutput: string
     }>((resolve) => {
@@ -238,6 +238,21 @@ export class NextStartInstance extends NextInstance {
         })
       })
     })
+
+    this._buildId = (
+      await fs
+        .readFile(
+          path.join(
+            this.testDir,
+            this.nextConfig?.distDir || '.next',
+            'BUILD_ID'
+          ),
+          'utf8'
+        )
+        .catch(() => '')
+    ).trim()
+
+    return result
   }
 
   public async waitForMinPrerenderAge(minAgeMS: number): Promise<void> {

test/production/standalone-mode/required-server-files/required-server-files.test.ts

@@ -247,11 +247,11 @@ describe('required server files', () => {
           redirect: 'manual',
         }
       )
-      expect(dataRes.headers.get('cache-control')).toBe(cacheControl)
       expect((await dataRes.json()).pageProps).toEqual({
         __N_REDIRECT: dest,
         __N_REDIRECT_STATUS: 307,
       })
+      expect(dataRes.headers.get('cache-control')).toBe(cacheControl)
     }
   )
 
@@ -321,6 +321,7 @@ describe('required server files', () => {
           redirect: 'manual',
         }
       )
+      expect(res.status).toBe(200)
       expect(dataRes.headers.get('cache-control')).toBe(cacheControl)
     }
   )