require File.dirname(__FILE__) + '/test_helper'

class TestKernel < Test::Unit::TestCase

  context "backticks" do
    should "raise a runtime error with contents of stderr if command does not succeed" do
      exception = assert_raises(RuntimeError) do
        `echo "error text on stderr" >&2; exit -1;`
      end
      
      assert_match "failed with: 'error text on stderr'", exception.message
    end
    
    should "raise runtime error with contents of stderr if command is not found" do
      exception = assert_raises(RuntimeError) do
        `bad-cmd`
      end
      
      assert_match "failed with: 'No such file or directory - bad-cmd'", exception.message
    end
  
    should "return the contents of stdout + stderr if command succeeds" do
      assert_match "std out\nstd err output\n", `echo "std out"; echo "std err output" >&2; exit 0;`
    end
  end
  
  context "%x{} syntax" do
    should "raise a runtime error with contents of stderr if command does not succeed" do
      exception = assert_raises(RuntimeError) do
        %x{echo "error text on stderr" >&2; exit -1;}
      end
      
      assert_match "failed with: 'error text on stderr'", exception.message
    end
  
    should "return the contents of stdout + stderr if command succeeds" do
      assert_match "std out\nstd err output\n", %x{echo "std out"; echo "std err output" >&2; exit 0;}
    end
  end
  
  context "system" do
    should "raise a runtime error with contents of stderr if command does not succeed" do
      exception = assert_raises(RuntimeError) do
        system %{echo "error text on stderr" >&2; exit -1;}
      end
      
      assert_match "failed with: 'error text on stderr'", exception.message
    end
    
    should "return true if command succeeds" do
      assert_kind_of TrueClass, system("echo 'hi!';")
    end
  end

  context "system!" do
    should "not raise an exception, even when command fails" do
      assert_nothing_raised {system!("exit -1;")}
    end
    
    should "return false when command fails" do
      assert_kind_of FalseClass, system!("exit -1;")
    end
    
    should "return true if command succeeds" do
      assert_kind_of TrueClass, system!("echo 'hi!';")
    end
  end

end