1 files changed, 17 insertions, 0 deletions
diff --git a/test/ruby/test_fixnum.rb b/test/ruby/test_fixnum.rb
index 8b2cf2e256..e10371d3e3 100644
--- a/test/ruby/test_fixnum.rb
+++ b/test/ruby/test_fixnum.rb
@@ -312,4 +312,21 @@ class TestFixnum < Test::Unit::TestCase
     assert_equal(1, 5.remainder(4))
     assert_predicate(4.remainder(Float::NAN), :nan?)
   end
+
+  def test_zero_p
+    assert_predicate(0, :zero?)
+    assert_not_predicate(1, :zero?)
+  end
+
+  def test_positive_p
+    assert_predicate(1, :positive?)
+    assert_not_predicate(0, :positive?)
+    assert_not_predicate(-1, :positive?)
+  end
+
+  def test_negative_p
+    assert_predicate(-1, :negative?)
+    assert_not_predicate(0, :negative?)
+    assert_not_predicate(1, :negative?)
+  end
 end