1 files changed, 40 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..677d8bb7b2
--- /dev/null
+++ b/spec/ruby/core/kernel/instance_variables_spec.rb
@@ -0,0 +1,40 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "Kernel#instance_variables" do
+  describe "immediate values" do
+    it "returns an empty array if no instance variables are defined" do
+      [0, 0.5, true, false, nil].each do |value|
+        value.instance_variables.should == []
+      end
+    end
+
+    it "returns the correct array if an instance variable is added" do
+      a = 0
+      ->{ 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
+
+    it "returns the instances variables in the order declared" do
+      c = Class.new do
+        def initialize
+          @c = 1
+          @a = 2
+          @b = 3
+        end
+      end
+      c.new.instance_variables.should == [:@c, :@a, :@b]
+    end
+  end
+end