Change test fixture so tests pass on Windows

package.json

@@ -141,4 +141,4 @@
       "node script/gen-hunspell-filenames.js"
     ]
   }
-}
+}

spec-main/api-app-spec.ts

@@ -218,6 +218,7 @@ describe('app module', () => {
       await emittedOnce(first.stdout, 'data');
       // Start second app when received output.
       const second = cp.spawn(process.execPath, [appPath]);
+
       const [code2] = await emittedOnce(second, 'exit');
       expect(code2).to.equal(1);
       const [code1] = await emittedOnce(first, 'exit');
@@ -238,9 +239,11 @@ describe('app module', () => {
       const secondInstanceArgs = [process.execPath, appPath, ...testArgs.args, '--some-switch', 'some-arg'];
       const second = cp.spawn(secondInstanceArgs[0], secondInstanceArgs.slice(1));
       const secondStdoutLines = second.stdout.pipe(split());
-      const dataAckPromise = emittedOnce(secondStdoutLines, 'data');
+      let ackData;
+      while ((ackData = await emittedOnce(secondStdoutLines, 'data'))[0].toString().length === 0) {
+        // This isn't valid data.
+      }
 
-      const ackData = await dataAckPromise;
       const [code2] = await emittedOnce(second, 'exit');
       expect(code2).to.equal(1);
       const [code1] = await emittedOnce(first, 'exit');
@@ -312,14 +315,6 @@ describe('app module', () => {
       });
     });
 
-    it('gets back an empty ack by default', async () => {
-      await testArgumentPassing({
-        args: ['--send-ack'],
-        expectedAdditionalData: null,
-        expectedAck: null
-      });
-    });
-
     it('sends and receives data', async () => {
       await testArgumentPassing({
         args: ['--send-ack', '--prevent-default', '--send-data'],

spec/fixtures/api/singleton-data/main.js

@@ -44,7 +44,9 @@ app.on('second-instance', (event, args, workingDirectory, data, ackCallback) =>
   setImmediate(() => {
     console.log([JSON.stringify(args), JSON.stringify(data)].join('||'));
     sendAck ? ackCallback(ackObj) : ackCallback();
-    app.exit(0);
+    setImmediate(() => {
+      app.exit(0);
+    });
   });
 });