Tests for Step class

Closes #419.

Library/Homebrew/test/test_cmd_testbot.rb

@@ -1,3 +1,5 @@
+require "pathname"
+
 require "testing_env"
 require "dev-cmd/test-bot"
 
@@ -33,3 +35,65 @@ class TestbotCommandTests < Homebrew::TestCase
     predicate.call "ARGV"
   end
 end
+
+class TestbotStepTests < Homebrew::TestCase
+  def run
+    [nil, "1"].each do |travis|
+      with_environment("TRAVIS" => travis) { super }
+    end
+    self
+  end
+
+  def teardown
+    unless passed?
+      raise "INFO: Previous test failed with ENV['TRAVIS'] = #{ENV["TRAVIS"].inspect}"
+    end
+  end
+
+  def stub_test_instance
+    stub(
+      :category => "stub",
+      :log_root => Pathname.pwd
+    )
+  end
+
+  def test_step_run_measures_execution_time
+    step = Homebrew::Step.new stub_test_instance, %w[sleep 0.1]
+    shutup do
+      step.run
+    end
+    assert_operator step.time, :>, 0.1
+    assert_operator step.time, :<, 1
+    assert_equal step.passed?, true
+  end
+
+  def test_step_run_observes_failure
+    step = Homebrew::Step.new stub_test_instance, ["false", ""]
+    shutup do
+      step.run
+    end
+    assert_equal step.passed?, false
+    assert_equal step.failed?, true
+  end
+
+  def test_step_dry_run_is_dry_and_always_succeeds
+    step = Homebrew::Step.new stub_test_instance, ["false", ""]
+    ARGV.expects(:include?).with("--dry-run").returns(true)
+    step.stubs(:fork).raises("Dry run isn't dry!")
+    shutup do
+      step.run
+    end
+    assert_equal step.passed?, true
+  end
+
+  def test_step_fail_fast_exits_on_failure
+    step = Homebrew::Step.new stub_test_instance, ["false", ""]
+    ARGV.stubs(:include?).returns(false)
+    ARGV.expects(:include?).with("--fail-fast").returns(true)
+    step.expects(:exit).with(1).returns(nil)
+    shutup do
+      step.run
+    end
+    assert_equal step.passed?, false
+  end
+end