allow spring to be force enabled

Readme.md

@@ -246,6 +246,7 @@ TIPS
  - [Distributed parallel test (e.g. Travis Support)](https://github.com/grosser/parallel_tests/wiki/Distributed-Parallel-Tests-and-Travis-Support)
  - Debug errors that only happen with multiple files using `--verbose` and [cleanser](https://github.com/grosser/cleanser)
  - Shell alias: `alias prspec='parallel_rspec -m 2 --'`
+ - [Spring] to use spring you have to [patch it](https://github.com/grosser/parallel_tests/wiki/Spring)
  - Contribute your own gotaches to the [Wiki](https://github.com/grosser/parallel_tests/wiki) or even better open a PR :)
 
 TODO

lib/parallel_tests/cli.rb

@@ -8,7 +8,7 @@ class CLI
     def run(argv)
       options = parse_options!(argv)
 
-      ENV['DISABLE_SPRING']='1'
+      ENV['DISABLE_SPRING'] ||= '1'
 
       num_processes = ParallelTests.determine_number_of_processes(options[:count])
       num_processes = num_processes * (options[:multiply] || 1)

spec/integration_spec.rb

@@ -208,6 +208,12 @@ def test_unicode
     expect(result).to include "SPRING: 1"
   end
 
+  it "can enable spring" do
+    write "spec/xxx_spec.rb", 'puts "SPRING: #{ENV["DISABLE_SPRING"]}"'
+    result = run_tests("spec", processes: 2, type: 'rspec', export: "DISABLE_SPRING=0")
+    expect(result).to include "SPRING: 0"
+  end
+
   it "runs with files that have spaces" do
     write "test/xxx _test.rb", 'puts "YES"'
     result = run_tests("test", processes: 2, type: 'test')