Merge remote-tracking branch 'remotes/mruby/master'

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diff --git a/test/t/methods.rb b/test/t/methods.rb
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+##
+# Chapter 13.3 "Methods" ISO Test
+
+assert('The alias statement', '13.3.6 a) 4)') do
+  # check aliasing in all possible ways
+
+  def alias_test_method_original; true; end
+
+  alias alias_test_method_a alias_test_method_original
+  alias :alias_test_method_b :alias_test_method_original
+
+  assert_true(alias_test_method_original)
+  assert_true(alias_test_method_a)
+  assert_true(alias_test_method_b)
+end
+
+assert('The alias statement (overwrite original)', '13.3.6 a) 4)') do
+  # check that an aliased method can be overwritten
+  # without side effect
+
+  def alias_test_method_original; true; end
+
+  alias alias_test_method_a alias_test_method_original
+  alias :alias_test_method_b :alias_test_method_original
+
+  assert_true(alias_test_method_original)
+
+  def alias_test_method_original; false; end
+
+  assert_false(alias_test_method_original)
+  assert_true(alias_test_method_a)
+  assert_true(alias_test_method_b)
+end
+
+assert('The alias statement', '13.3.6 a) 5)') do
+  # check that alias is raising NameError if
+  # non-existing method should be undefined
+
+  assert_raise(NameError) do
+    alias new_name_a non_existing_method
+  end
+
+  assert_raise(NameError) do
+    alias :new_name_b :non_existing_method
+  end
+end
+
+assert('The undef statement', '13.3.7 a) 4)') do
+  # check that undef is undefining method
+  # based on the method name
+
+  def existing_method_a; true; end
+  def existing_method_b; true; end
+  def existing_method_c; true; end
+  def existing_method_d; true; end
+  def existing_method_e; true; end
+  def existing_method_f; true; end
+
+  # check that methods are defined
+
+  assert_true(existing_method_a, 'Method should be defined')
+  assert_true(existing_method_b, 'Method should be defined')
+  assert_true(existing_method_c, 'Method should be defined')
+  assert_true(existing_method_d, 'Method should be defined')
+  assert_true(existing_method_e, 'Method should be defined')
+  assert_true(existing_method_f, 'Method should be defined')
+
+  # undefine in all possible ways and check that method 
+  # is undefined
+
+  undef existing_method_a
+  assert_raise(NoMethodError) do
+    existing_method_a
+  end
+
+  undef :existing_method_b
+  assert_raise(NoMethodError) do
+    existing_method_b
+  end
+
+  undef existing_method_c, existing_method_d
+  assert_raise(NoMethodError) do
+    existing_method_c
+  end
+  assert_raise(NoMethodError) do
+    existing_method_d
+  end
+
+  undef :existing_method_e, :existing_method_f
+  assert_raise(NoMethodError) do
+    existing_method_e
+  end
+  assert_raise(NoMethodError) do
+    existing_method_f
+  end
+end
+
+assert('The undef statement (method undefined)', '13.3.7 a) 5)') do
+  # check that undef is raising NameError if
+  # non-existing method should be undefined
+
+  assert_raise(NameError) do
+    undef non_existing_method
+  end
+
+  assert_raise(NameError) do
+    undef :non_existing_method
+  end
+end