test_mapped_diagnostic_context.rb

require File.expand_path('../setup', __FILE__)

module TestLogging

  class TestMappedDiagnosticContext < Test::Unit::TestCase
    include LoggingTestCase

    def test_key_value_access
      assert_nil Logging.mdc['foo']

      Logging.mdc['foo'] = 'bar'
      assert_equal 'bar', Logging.mdc[:foo]
      assert_same Logging.mdc['foo'], Logging.mdc[:foo]

      Logging.mdc.delete(:foo)
      assert_nil Logging.mdc['foo']
    end

    def test_clear
      Logging.mdc['foo'] = 'bar'
      Logging.mdc['baz'] = 'buz'

      assert_equal 'bar', Logging.mdc[:foo]
      assert_equal 'buz', Logging.mdc[:baz]

      Logging.mdc.clear

      assert_nil Logging.mdc['foo']
      assert_nil Logging.mdc['baz']
    end

    def test_context_update
      Logging.mdc.update(:foo => 'bar', :baz => 'buz')
      assert_equal 'bar', Logging.mdc[:foo]
      assert_equal 'buz', Logging.mdc[:baz]

      Logging.mdc.update('foo' => 1, 'baz' => 2)
      assert_equal 1, Logging.mdc[:foo]
      assert_equal 2, Logging.mdc[:baz]

      assert_equal 1, Logging.mdc.stack.length
    end

    def test_context_pushing
      assert Logging.mdc.context.empty?
      assert_equal 1, Logging.mdc.stack.length

      Logging.mdc.push(:foo => 'bar', :baz => 'buz')
      assert_equal 'bar', Logging.mdc[:foo]
      assert_equal 'buz', Logging.mdc[:baz]
      assert_equal 2, Logging.mdc.stack.length

      Logging.mdc.push(:foo => 1, :baz => 2, :foobar => 3)
      assert_equal 1, Logging.mdc[:foo]
      assert_equal 2, Logging.mdc[:baz]
      assert_equal 3, Logging.mdc[:foobar]
      assert_equal 3, Logging.mdc.stack.length

      Logging.mdc.pop
      assert_equal 'bar', Logging.mdc[:foo]
      assert_equal 'buz', Logging.mdc[:baz]
      assert_nil Logging.mdc[:foobar]
      assert_equal 2, Logging.mdc.stack.length

      Logging.mdc.pop
      assert Logging.mdc.context.empty?
      assert_equal 1, Logging.mdc.stack.length

      Logging.mdc.pop
      assert Logging.mdc.context.empty?
      assert_equal 1, Logging.mdc.stack.length
    end

    def test_thread_uniqueness
      Logging.mdc['foo'] = 'bar'
      Logging.mdc['baz'] = 'buz'

      t = Thread.new {
        sleep

        Logging.mdc.clear
        assert_nil Logging.mdc['foo']
        assert_nil Logging.mdc['baz']

        Logging.mdc['foo'] = 42
        assert_equal 42, Logging.mdc['foo']
      }

      Thread.pass until t.status == 'sleep'
      t.run
      t.join

      assert_equal 'bar', Logging.mdc['foo']
      assert_equal 'buz', Logging.mdc['baz']
    end

    def test_thread_inheritance
      Logging.mdc['foo'] = 'bar'
      Logging.mdc['baz'] = 'buz'
      Logging.mdc.push(:foo => 1, 'foobar' => 'something else')

      t = Thread.new(Logging.mdc.context) { |context|
        sleep

        assert_not_equal context.object_id, Logging.mdc.context.object_id

        if Logging::INHERIT_CONTEXT
          assert_equal 1, Logging.mdc['foo']
          assert_equal 'buz', Logging.mdc['baz']
          assert_equal 'something else', Logging.mdc['foobar']
          assert_nil Logging.mdc['unique']

          assert_equal 1, Logging.mdc.stack.length
        else
          assert_nil Logging.mdc['foo']
          assert_nil Logging.mdc['baz']
          assert_nil Logging.mdc['foobar']
          assert_nil Logging.mdc['unique']

          assert_equal 1, Logging.mdc.stack.length
        end
      }

      Thread.pass until t.status == 'sleep'

      Logging.mdc.pop
      Logging.mdc['unique'] = 'value'

      t.run
      t.join
    end

  end  # class TestMappedDiagnosticContext
end  # module TestLogging