test: wait for stdio streams of process to close (#169)

Author: merceyz

tests/_runCli.ts

@@ -24,7 +24,7 @@ export async function runCli(cwd: PortablePath, argv: Array<string>) {
       reject(error);
     });
 
-    child.on(`exit`, exitCode => {
+    child.on(`close`, exitCode => {
       resolve({
         exitCode,
         stdout: Buffer.concat(out).toString(),