fix(test): isolate integration tests from production hub via temp hub globalSetup (#734)

cli/src/utils/spawnHappyCLI.test.ts

@@ -37,6 +37,7 @@ vi.mock('@/projectPath', () => ({
 const originalPlatformDescriptor = Object.getOwnPropertyDescriptor(process, 'platform');
 const originalInvokedCwd = process.env.HAPI_INVOKED_CWD;
 const originalCliExecutable = process.env.HAPI_CLI_EXECUTABLE;
+const originalBunExec = process.env.HAPI_BUN_EXEC;
 
 function setPlatform(value: string) {
   Object.defineProperty(process, 'platform', {
@@ -78,6 +79,11 @@ describe('spawnHappyCLI windowsHide behavior', () => {
     } else {
       process.env.HAPI_CLI_EXECUTABLE = originalCliExecutable;
     }
+    if (originalBunExec === undefined) {
+      delete process.env.HAPI_BUN_EXEC;
+    } else {
+      process.env.HAPI_BUN_EXEC = originalBunExec;
+    }
   });
 
   afterAll(() => {
@@ -129,6 +135,8 @@ describe('spawnHappyCLI windowsHide behavior', () => {
   });
 
   it('forces Bun child processes to run with the cli project root as cwd', async () => {
+    // Clear the test-isolation override so we test the pure runtime behaviour
+    delete process.env.HAPI_BUN_EXEC;
     const { getHappyCliCommand } = await import('./spawnHappyCLI');
 
     const command = getHappyCliCommand(['mcp', '--url', 'http://127.0.0.1:1234/']);

cli/src/utils/spawnHappyCLI.ts

@@ -116,6 +116,16 @@ export function getHappyCliCommand(args: string[]): HappyCliCommand {
     };
   }
 
+  // When vitest runs under Node.js, HAPI_BUN_EXEC can point to the bun binary so that
+  // spawned CLI child processes still run under bun (which is required for TypeScript entrypoints).
+  const bunExecOverride = process.env['HAPI_BUN_EXEC']?.trim();
+  if (bunExecOverride && isCrossPlatformAbsolutePath(bunExecOverride) && existsSync(bunExecOverride)) {
+    return {
+      command: bunExecOverride,
+      args: ['--cwd', projectRoot, entrypoint, ...args]
+    };
+  }
+
   // Node.js fallback: preserve execArgv (for compatibility)
   return {
     command: process.execPath,