1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/succ_spec.rb b/spec/ruby/core/integer/succ_spec.rb
new file mode 100644
index 0000000000..2201a4c76d
--- /dev/null
+++ b/spec/ruby/core/integer/succ_spec.rb
@@ -0,0 +1,27 @@
+require_relative '../../spec_helper'
+
+describe "Integer#succ" do
+  it "returns the next larger positive Fixnum" do
+    2.succ.should == 3
+  end
+
+  it "returns the next larger negative Fixnum" do
+    (-2).succ.should == -1
+  end
+
+  it "returns the next larger positive Bignum" do
+    bignum_value.succ.should == bignum_value(1)
+  end
+
+  it "returns the next larger negative Bignum" do
+    (-bignum_value(1)).succ.should == -bignum_value
+  end
+
+  it "overflows a Fixnum to a Bignum" do
+    fixnum_max.succ.should == fixnum_max + 1
+  end
+
+  it "underflows a Bignum to a Fixnum" do
+    (fixnum_min - 1).succ.should == fixnum_min
+  end
+end