1 files changed, 27 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/instance_variables_spec.rb b/spec/ruby/core/kernel/instance_variables_spec.rb
new file mode 100644
index 0000000000..f744ee3c7a
--- /dev/null
+++ b/spec/ruby/core/kernel/instance_variables_spec.rb
@@ -0,0 +1,27 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "Kernel#instance_variables" do
+  describe "immediate values" do
+    it "returns an empty array if no instance variables are defined" do
+      0.instance_variables.should == []
+    end
+
+    it "returns the correct array if an instance variable is added" do
+      a = 0
+      lambda{ a.instance_variable_set("@test", 1) }.should raise_error(RuntimeError)
+    end
+  end
+
+  describe "regular objects" do
+    it "returns an empty array if no instance variables are defined" do
+      Object.new.instance_variables.should == []
+    end
+
+    it "returns the correct array if an instance variable is added" do
+      a = Object.new
+      a.instance_variable_set("@test", 1)
+      a.instance_variables.should == [:@test]
+    end
+  end
+end