fix(@angular/build): setup unit-test polyfills before TestBed init

clydin · clydin · commit 8b2ca7ae2617 · 2025-05-14T07:12:28.000-04:00
To ensure that Zone.js is fully setup and patched prior to the use of TestBed,
the setup file order for the `vitest` runner of the `unit-test` builder
has been swapped. This is particularly relevant for `fakeAsync` which
has a module level statement that attempts to capture the `Zone` instance.
If Zone.js is not setup at that point, fakeAsync will fail to function in
tests.
diff --git a/packages/angular/build/src/builders/unit-test/builder.ts b/packages/angular/build/src/builders/unit-test/builder.ts
@@ -194,7 +194,7 @@ export async function* execute(
   // Add setup file entries for TestBed initialization and project polyfills
   const setupFiles = ['init-testbed.js'];
   if (buildTargetOptions?.polyfills?.length) {
-    setupFiles.push('polyfills.js');
+    setupFiles.unshift('polyfills.js');
   }
 
   try {

Original file line number	Diff line number	Diff line change
`@@ -194,7 +194,7 @@ export async function* execute(`
`194`	`194`	`// Add setup file entries for TestBed initialization and project polyfills`
`195`	`195`	`const setupFiles = ['init-testbed.js'];`
`196`	`196`	`if (buildTargetOptions?.polyfills?.length) {`
`197`		`- setupFiles.push('polyfills.js');`
	`197`	`+ setupFiles.unshift('polyfills.js');`
`198`	`198`	`}`
`199`	`199`
`200`	`200`	`try {`