1 files changed, 38 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/odd_spec.rb b/spec/ruby/core/integer/odd_spec.rb
new file mode 100644
index 0000000000..dd779fa44b
--- /dev/null
+++ b/spec/ruby/core/integer/odd_spec.rb
@@ -0,0 +1,38 @@
+require_relative '../../spec_helper'
+
+describe "Integer#odd?" do
+  context "fixnum" do
+    it "returns true when self is an odd number" do
+      (-2).odd?.should be_false
+      (-1).odd?.should be_true
+
+      0.odd?.should be_false
+      1.odd?.should be_true
+      2.odd?.should be_false
+
+      bignum_value(0).odd?.should be_false
+      bignum_value(1).odd?.should be_true
+
+      (-bignum_value(0)).odd?.should be_false
+      (-bignum_value(1)).odd?.should be_true
+    end
+  end
+
+  context "bignum" do
+    it "returns true if self is odd and positive" do
+      (987279**19).odd?.should be_true
+    end
+
+    it "returns true if self is odd and negative" do
+      (-9873389**97).odd?.should be_true
+    end
+
+    it "returns false if self is even and positive" do
+      (10000000**10).odd?.should be_false
+    end
+
+    it "returns false if self is even and negative" do
+      (-1000000**100).odd?.should be_false
+    end
+  end
+end