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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Kernel#instance_variable_defined?" do
before do
@instance = KernelSpecs::InstanceVariable.new
end
describe "when passed a String" do
it "returns false if the instance variable is not defined" do
@instance.instance_variable_defined?("@goodbye").should be_false
end
it "returns true if the instance variable is defined" do
@instance.instance_variable_defined?("@greeting").should be_true
end
end
describe "when passed a Symbol" do
it "returns false if the instance variable is not defined" do
@instance.instance_variable_defined?(:@goodbye).should be_false
end
it "returns true if the instance variable is defined" do
@instance.instance_variable_defined?(:@greeting).should be_true
end
end
it "raises a TypeError if passed an Object not defining #to_str" do
lambda do
obj = mock("kernel instance_variable_defined?")
@instance.instance_variable_defined? obj
end.should raise_error(TypeError)
end
end
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