Extract thor_command into helper run_thor_fixture_standalone

Author: MaxLap

spec/helper.rb

@@ -80,4 +80,24 @@ def silence_warnings
   end
 
   alias silence capture
+
+  # Runs the fixture in a different process.
+  # Useful to deal with exit_on_failure?, which interrupts the tests when it calls `exit`
+  # This doesn't run on ruby 1.8.7
+  def run_thor_fixture_standalone(fixture, command)
+    gem_dir = File.expand_path("#{File.dirname(__FILE__)}/..")
+    lib_path = "#{gem_dir}/lib"
+    script_path = "#{gem_dir}/spec/fixtures/#{fixture}.thor"
+    ruby_lib = ENV['RUBYLIB'].nil? ? lib_path : "#{lib_path}:#{ENV['RUBYLIB']}"
+
+    if command.is_a?(String)
+      full_command = "ruby #{script_path} #{command}"
+    elsif command.is_a?(Array)
+      full_command = ['ruby', script_path] + command
+    end
+
+    require 'open3'
+    stdout, stderr, status = Open3.capture3({'RUBYLIB' => ruby_lib}, *full_command)
+    [stdout, stderr, status]
+  end
 end

spec/script_exit_status_spec.rb

@@ -20,10 +20,12 @@ def thor_command(command)
   end
 
   it "a command that raises a Thor::Error exits with a status of 1" do
-    expect(thor_command("error")).to eq(1)
+    _stdout, _stderr, status = run_thor_fixture_standalone('exit_status', ['error'])
+    expect(status.exitstatus).to eq(1)
   end
 
   it "a command that does not raise a Thor::Error exits with a status of 0" do
-    expect(thor_command("ok")).to eq(0)
+    _stdout, _stderr, status = run_thor_fixture_standalone('exit_status', ['ok'])
+    expect(status.exitstatus).to eq(0)
   end
 end if RUBY_VERSION > "1.8.7"