fix(migrations): don't add ModuleWithProviders to standalone test components (#48987)

Fixes that we were copying all expressions in the `imports` array of the test to the `imports` of the component, including any potential `ModuleWithProviders`.

Fixes #48971.

PR Close #48987

packages/core/schematics/ng-generate/standalone-migration/to-standalone.ts

@@ -569,7 +569,8 @@ function analyzeTestingModules(
 
     const importsProp = findLiteralProperty(obj, 'imports');
     const importElements = importsProp && hasNgModuleMetadataElements(importsProp) ?
-        importsProp.initializer.elements :
+        // Filter out calls since they may be a `ModuleWithProviders`.
+        importsProp.initializer.elements.filter(el => !ts.isCallExpression(el)) :
         null;
 
     for (const decl of declarations) {

packages/core/schematics/test/standalone_migration_spec.ts

@@ -1095,6 +1095,47 @@ describe('standalone migration', () => {
     `));
   });
 
+  it('should not add ModuleWithProviders imports to the `imports` in a test', async () => {
+    writeFile('app.spec.ts', `
+      import {NgModule, Component} from '@angular/core';
+      import {TestBed} from '@angular/core/testing';
+      import {MatCardModule} from '@angular/material/card';
+
+      describe('bootrstrapping an app', () => {
+        it('should work', () => {
+          TestBed.configureTestingModule({
+            declarations: [App],
+            imports: [MatCardModule.forRoot({})]
+          });
+          const fixture = TestBed.createComponent(App);
+          expect(fixture.nativeElement.innerHTML).toBe('hello');
+        });
+      });
+
+      @Component({template: 'hello'})
+      class App {}
+    `);
+
+    await runMigration('convert-to-standalone');
+
+    const content = stripWhitespace(tree.readContent('app.spec.ts'));
+
+    expect(content).toContain(stripWhitespace(`
+      @Component({template: 'hello', standalone: true})
+      class App {}
+    `));
+
+    expect(content).toContain(stripWhitespace(`
+      it('should work', () => {
+        TestBed.configureTestingModule({
+          imports: [MatCardModule.forRoot({}), App]
+        });
+        const fixture = TestBed.createComponent(App);
+        expect(fixture.nativeElement.innerHTML).toBe('hello');
+      });
+    `));
+  });
+
   it('should not change testing objects with no declarations', async () => {
     const initialContent = `
       import {NgModule, Component} from '@angular/core';