1 files changed, 19 insertions, 4 deletions
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index e855d5617d..51dcb8e29b 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -19,10 +19,6 @@ class TestBigDecimal < Test::Unit::TestCase
     [ BigDecimal::ROUND_FLOOR,     :floor],
   ]
 
-  def assert_allocate
-    assert_raise(TypeError) {BigDecimal.allocate}
-  end
-
   def assert_nan(x)
     assert(x.nan?, "Expected #{x.inspect} to be NaN")
   end
@@ -47,6 +43,10 @@ class TestBigDecimal < Test::Unit::TestCase
                  "Expected #{x.inspect} to be negative zero")
   end
 
+  def test_not_equal
+    assert_not_equal BigDecimal("1"), BigDecimal.allocate
+  end
+
   def test_global_new
     assert_equal(1, BigDecimal("1"))
     assert_equal(1, BigDecimal("1", 1))
@@ -1288,4 +1288,19 @@ class TestBigDecimal < Test::Unit::TestCase
       end
     end
   end
+
+  def test_dup
+    [1, -1, 2**100, -2**100].each do |i|
+      x = BigDecimal(i)
+      assert_equal(x, x.dup)
+    end
+  end
+
+  def test_dup_subclass
+    c = Class.new(BigDecimal)
+    x = c.new(1)
+    y = x.dup
+    assert_equal(1, y)
+    assert_kind_of(c, y)
+  end
 end