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require_relative '../../spec_helper'
describe 'String#-@' do
it 'returns self if the String is frozen' do
input = 'foo'.freeze
output = -input
output.should equal(input)
output.frozen?.should == true
end
it 'returns a frozen copy if the String is not frozen' do
input = 'foo'
output = -input
output.frozen?.should == true
output.should_not equal(input)
output.should == 'foo'
end
ruby_version_is "2.5" do
it "returns the same object for equal unfrozen strings" do
origin = "this is a string"
dynamic = %w(this is a string).join(' ')
origin.should_not equal(dynamic)
(-origin).should equal(-dynamic)
end
it "returns the same object when it's called on the same String literal" do
(-"unfrozen string").should equal(-"unfrozen string")
(-"unfrozen string").should_not equal(-"another unfrozen string")
end
end
ruby_version_is "2.5"..."2.6" do
it "does not deduplicate already frozen strings" do
dynamic = %w(this string is frozen).join(' ').freeze
dynamic.should_not equal("this string is frozen".freeze)
(-dynamic).should_not equal("this string is frozen".freeze)
(-dynamic).should_not equal(-"this string is frozen".freeze)
(-dynamic).should == "this string is frozen"
end
it "does not deduplicate tainted strings" do
dynamic = %w(this string is frozen).join(' ')
dynamic.taint
(-dynamic).should_not equal("this string is frozen".freeze)
(-dynamic).should_not equal(-"this string is frozen".freeze)
(-dynamic).should == "this string is frozen"
end
it "does not deduplicate strings with additional instance variables" do
dynamic = %w(this string is frozen).join(' ')
dynamic.instance_variable_set(:@foo, :bar)
(-dynamic).should_not equal("this string is frozen".freeze)
(-dynamic).should_not equal(-"this string is frozen".freeze)
(-dynamic).should == "this string is frozen"
end
end
ruby_version_is "2.6" do
it "deduplicates frozen strings" do
dynamic = %w(this string is frozen).join(' ').freeze
dynamic.should_not equal("this string is frozen".freeze)
(-dynamic).should equal("this string is frozen".freeze)
(-dynamic).should equal(-"this string is frozen".freeze)
end
end
end
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