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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Kernel#instance_variable_get" do
before(:each) do
@obj = Object.new
@obj.instance_variable_set("@test", :test)
end
it "tries to convert the passed argument to a String using #to_str" do
obj = mock("to_str")
obj.should_receive(:to_str).and_return("@test")
@obj.instance_variable_get(obj)
end
it "returns the value of the passed instance variable that is referred to by the conversion result" do
obj = mock("to_str")
obj.stub!(:to_str).and_return("@test")
@obj.instance_variable_get(obj).should == :test
end
it "returns nil when the referred instance variable does not exist" do
@obj.instance_variable_get(:@does_not_exist).should be_nil
end
it "raises a TypeError when the passed argument does not respond to #to_str" do
lambda { @obj.instance_variable_get(Object.new) }.should raise_error(TypeError)
end
it "raises a TypeError when the passed argument can't be converted to a String" do
obj = mock("to_str")
obj.stub!(:to_str).and_return(123)
lambda { @obj.instance_variable_get(obj) }.should raise_error(TypeError)
end
it "raises a NameError when the conversion result does not start with an '@'" do
obj = mock("to_str")
obj.stub!(:to_str).and_return("test")
lambda { @obj.instance_variable_get(obj) }.should raise_error(NameError)
end
it "returns nil when passed just '@'" do
obj = mock("to_str")
obj.stub!(:to_str).and_return('@')
@obj.instance_variable_get(obj).should be_nil
end
end
describe "Kernel#instance_variable_get when passed Symbol" do
before(:each) do
@obj = Object.new
@obj.instance_variable_set("@test", :test)
end
it "returns the value of the instance variable that is referred to by the passed Symbol" do
@obj.instance_variable_get(:@test).should == :test
end
it "raises a NameError when the passed Symbol does not start with an '@'" do
lambda { @obj.instance_variable_get(:test) }.should raise_error(NameError)
end
it "returns nil when passed just '@'" do
@obj.instance_variable_get(:"@").should be_nil
end
end
describe "Kernel#instance_variable_get when passed String" do
before(:each) do
@obj = Object.new
@obj.instance_variable_set("@test", :test)
end
it "returns the value of the instance variable that is referred to by the passed String" do
@obj.instance_variable_get("@test").should == :test
end
it "raises a NameError when the passed String does not start with an '@'" do
lambda { @obj.instance_variable_get("test") }.should raise_error(NameError)
end
it "returns nil when passed just '@'" do
@obj.instance_variable_get("@").should be_nil
end
end
describe "Kernel#instance_variable_get when passed Fixnum" do
before(:each) do
@obj = Object.new
@obj.instance_variable_set("@test", :test)
end
ruby_version_is "" ... "1.9" do
deviates_on :rubinius do
it "always raises an ArgumentError" do
lambda { @obj.instance_variable_get(0) }.should raise_error(ArgumentError)
lambda { @obj.instance_variable_get(10) }.should raise_error(ArgumentError)
lambda { @obj.instance_variable_get(100) }.should raise_error(ArgumentError)
lambda { @obj.instance_variable_get(-100) }.should raise_error(ArgumentError)
end
end
not_compliant_on :rubinius do
it "tries to convert the passed Integer to a Symbol and returns the instance variable that is referred by the Symbol" do
@obj.instance_variable_get(:@test.to_i).should == :test
end
it "outputs a warning" do
lambda { @obj.instance_variable_get(:@test.to_i) }.should complain(/#{"do not use Fixnums as Symbols"}/)
end
it "raises an ArgumentError when the passed Fixnum can't be converted to a Symbol" do
lambda { @obj.instance_variable_get(-10) }.should raise_error(ArgumentError)
end
it "raises a NameError when the Symbol does not start with an '@'" do
lambda { @obj.instance_variable_get(:test.to_i) }.should raise_error(NameError)
end
end
end
ruby_version_is "1.9" do
it "raises a TypeError" do
lambda { @obj.instance_variable_get(10) }.should raise_error(TypeError)
lambda { @obj.instance_variable_get(-10) }.should raise_error(TypeError)
end
end
end
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