Add test for issue #19758: beforeAll in nested describe runs too early

test/regression/issue/19758.test.ts

@@ -0,0 +1,80 @@
+import { describe, it, beforeAll, expect } from 'bun:test';
+
+// Execution order log
+const executionLog: string[] = [];
+
+describe('outer', () => {
+  console.log('EVALUATION: outer describe');
+  
+  beforeAll(() => {
+    console.log('EXECUTION: outer beforeAll');
+    executionLog.push('outer beforeAll');
+  });
+
+  describe('inner1', () => {
+    console.log('EVALUATION: inner1 describe');
+    
+    beforeAll(() => {
+      console.log('EXECUTION: inner1 beforeAll');
+      executionLog.push('inner1 beforeAll');
+    });
+    
+    it('inner1 test', () => {
+      console.log('EXECUTION: inner1 test');
+      executionLog.push('inner1 test');
+      expect(true).toBe(true);
+    });
+  });
+
+  describe('inner2', () => {
+    console.log('EVALUATION: inner2 describe');
+    
+    beforeAll(() => {
+      console.log('EXECUTION: inner2 beforeAll');
+      executionLog.push('inner2 beforeAll');
+    });
+    
+    it('inner2 test', () => {
+      console.log('EXECUTION: inner2 test');
+      executionLog.push('inner2 test');
+      expect(true).toBe(true);
+    });
+  });
+
+  // At the end of all tests, we'll check if execution order matches what we expect
+  it('should execute beforeAll hooks in the correct order', () => {
+    console.log('EXECUTION: outer test');
+    
+    // For Jest-compatible behavior, the executionLog should be:
+    // [
+    //   'outer beforeAll',        // First execute outer beforeAll
+    //   'inner1 beforeAll',       // Then inner1 beforeAll right before its tests
+    //   'inner1 test',            // Then inner1 test
+    //   'inner2 beforeAll',       // Then inner2 beforeAll right before its tests
+    //   'inner2 test',            // Then inner2 test
+    //   'outer test'              // Then the outer test
+    // ]
+    
+    // But currently in Bun, the executionLog is:
+    // [
+    //   'outer beforeAll',
+    //   'inner1 beforeAll',
+    //   'inner2 beforeAll',
+    //   'inner1 test',
+    //   'inner2 test',
+    //   'outer test'
+    // ]
+    
+    console.log('Execution log:', executionLog);
+    
+    // This test will initially fail, but after our fix it should pass
+    expect(executionLog).toEqual([
+      'outer beforeAll',
+      'inner1 beforeAll',
+      'inner1 test',
+      'inner2 beforeAll',
+      'inner2 test',
+      'outer test'
+    ]);
+  });
+});