anchor.diff:  }
   
   void verify(String exePath, {String altPath}) {
  -  var env = {'SCRIPT': 'yes'};
  +  var env = {_SCRIPT_KEY: 'yes'};
     if (altPath != null) {
       env['PATH'] = altPath;
     }
  
positive.code: void testShouldFailOutsidePath() {
    var threw = false;
    try {
      Process.runSync(platformExeName, [scriptPath], 
        includeParentEnvironment: false, environment: {'SCRIPT': 'yes'});
    } catch (_) {
      threw = true;
    }
  
    expectEquals(true, threw);
  }
  
  void testShouldSucceedWithSourcePlatformExecutable() {
  
negative.code: 
  import "dart:io";
  
  const _SCRIPT_KEY = '_test_script';
  
  void expectEquals(a, b) {
    if (a != b) {
      throw 'Expected: $a\n'
  