-e / --environment for the test runner.

railties/lib/rails/commands/test.rb

@@ -1,5 +1,5 @@
-ENV["RAILS_ENV"] = "test"
 require "rails/test_unit/runner"
 
 $: << File.expand_path("../../test", APP_PATH)
+
 Rails::TestRunner.run(ARGV)

railties/lib/rails/test_unit/runner.rb

@@ -7,11 +7,16 @@ module Rails
   class TestRunner
     class Options
       def self.parse(args)
-        options = { backtrace: false, name: nil }
+        options = { backtrace: false, name: nil, environment: "test" }
 
         opt_parser = ::OptionParser.new do |opts|
           opts.banner = "Usage: bin/rails test [options] [file or directory]"
 
+          opts.separator ""
+          opts.on("-e", "--environment [ENV]",
+                  "run tests in the ENV environment") do |env|
+            options[:environment] = env.strip
+          end
           opts.separator ""
           opts.separator "Filter options:"
           opts.separator ""
@@ -70,6 +75,7 @@ module Rails
 
     def run
       $rails_test_runner = self
+      ENV["RAILS_ENV"] = @options[:environment]
       run_tests
     end
 

railties/test/test_unit/runner_test.rb

@@ -19,6 +19,16 @@ class TestUnitTestRunnerTest < ActiveSupport::TestCase
     assert options[:backtrace]
   end
 
+  test "tests run in the test environment by default" do
+    options = @options.parse([])
+    assert_equal "test", options[:environment]
+  end
+
+  test "can run in a specific environment" do
+    options = @options.parse(["-e development"])
+    assert_equal "development", options[:environment]
+  end
+
   test "parse the filename and line" do
     options = @options.parse(["foobar.rb:20"])
     assert_equal File.expand_path("foobar.rb"), options[:filename]
@@ -52,4 +62,8 @@ class TestUnitTestRunnerTest < ActiveSupport::TestCase
     assert_nil options[:filename]
     assert_nil options[:line]
   end
+
+  test "run multiple files" do
+    skip "needs implementation"
+  end
 end