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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
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
-> { @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)
-> { @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")
-> { @obj.instance_variable_get(obj) }.should raise_error(NameError)
end
it "raises a NameError when passed just '@'" do
obj = mock("to_str")
obj.stub!(:to_str).and_return('@')
-> { @obj.instance_variable_get(obj) }.should raise_error(NameError)
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 passed :@ as an instance variable name" do
-> { @obj.instance_variable_get(:"@") }.should raise_error(NameError)
end
it "raises a NameError when the passed Symbol does not start with an '@'" do
-> { @obj.instance_variable_get(:test) }.should raise_error(NameError)
end
it "raises a NameError when the passed Symbol is an invalid instance variable name" do
-> { @obj.instance_variable_get(:"@0") }.should raise_error(NameError)
end
it "returns nil or raises for frozen objects" do
nil.instance_variable_get(:@foo).should == nil
-> { nil.instance_variable_get(:foo) }.should raise_error(NameError)
:foo.instance_variable_get(:@foo).should == 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
-> { @obj.instance_variable_get("test") }.should raise_error(NameError)
end
it "raises a NameError when the passed String is an invalid instance variable name" do
-> { @obj.instance_variable_get("@0") }.should raise_error(NameError)
end
it "raises a NameError when passed '@' as an instance variable name" do
-> { @obj.instance_variable_get("@") }.should raise_error(NameError)
end
end
describe "Kernel#instance_variable_get when passed Integer" do
before :each do
@obj = Object.new
@obj.instance_variable_set("@test", :test)
end
it "raises a TypeError" do
-> { @obj.instance_variable_get(10) }.should raise_error(TypeError)
-> { @obj.instance_variable_get(-10) }.should raise_error(TypeError)
end
end
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