IntelliJ doesn't save code changes before running tests

Environment info:

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.5.4-hotfix.2, on Microsoft Windows [Version 10.0.17763.557], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[√] Android Studio (version 3.4)
[√] IntelliJ IDEA Ultimate Edition (version 2019.1)
[√] VS Code (version 1.33.1)

Steps to reproduce problem:

1. Create Flutter project
2. Create unit/calculator.dart:

int calculate(int a) {
  return a + 3;
}

1. Create unit/test.dart

import 'package:flutter_test/flutter_test.dart';

import 'calculator.dart';

void main() {
  group('simple', () {
    test('calculate', () {
      final value = calculate(2);

      expect(value, 5);
    });
  });
}

1. Place breakpoint on the line with expect to see the value of the variable value.
2. Run the program with SHIFT + F10 This is the command executed: flutter\bin\flutter.bat --no-color test --machine test\unit\test.dart
3. Change the added value in the calculator:

int calculate(int a) {
  return a + 30;
}

1. Run debug with SHIFT + F9 This is the command executed: flutter\bin\flutter.bat --no-color test --machine --start-paused test\unit\test.dart

2. Problem: Old value is shown, code did not compile again.

[ThinkDigitalSoftware]

I tested and verified the same behavior. I did this by doing a watch -d -n 1 cat my_file_test.dart in an external terminal window and running tests. I simply would add some nonsense that wouldn’t compile and ran the test without switching windows and it would compile successfully. The watch showed no changes. As soon as I clicked outside of IntelliJ (clicking the internal terminal didn’t work for me) then the watch updated and the tests would no longer compile. Good catch, @andrasferenczi!

[andrasferenczi]

@TahaTesser I would say this describes the way I was trying to reproduce the issue on the command line and I am getting exactly the same thing as you did for the output