recreate the envrionment in a durable way

Author: matthargett

jest/helpers.ts

@@ -132,8 +132,14 @@ function getExecaOptions(options: SpawnOptions) {
 
   const cwd = isRelative ? path.resolve(__dirname, options.cwd) : options.cwd;
 
+  const localBin = path.resolve(cwd, 'node_modules/.bin');
+
+  // Merge the existing environment with the new one
   let env = Object.assign({}, process.env, {FORCE_COLOR: '0'}, options.env);
 
+  // Prepend the local node_modules/.bin to the PATH
+  env.PATH = `${localBin}${path.delimiter}${env.PATH}`;
+
   if (options.nodeOptions) {
     env.NODE_OPTIONS = options.nodeOptions;
   }