1 files changed, 20 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/abs_spec.rb b/spec/ruby/core/integer/abs_spec.rb
new file mode 100644
index 0000000000..768eebdce2
--- /dev/null
+++ b/spec/ruby/core/integer/abs_spec.rb
@@ -0,0 +1,20 @@
+require_relative '../../spec_helper'
+
+describe "Integer#abs" do
+  context "fixnum" do
+    it "returns self's absolute fixnum value" do
+      { 0 => [0, -0, +0], 2 => [2, -2, +2], 100 => [100, -100, +100] }.each do |key, values|
+        values.each do |value|
+          value.abs.should == key
+        end
+      end
+    end
+  end
+
+  context "bignum" do
+    it "returns the absolute bignum value" do
+      bignum_value(39).abs.should == 18446744073709551655
+      (-bignum_value(18)).abs.should == 18446744073709551634
+    end
+  end
+end