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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes.rb', __FILE__)
describe "String#prepend" do
it "prepends the given argument to self and returns self" do
str = "world"
str.prepend("hello ").should equal(str)
str.should == "hello world"
end
it "converts the given argument to a String using to_str" do
obj = mock("hello")
obj.should_receive(:to_str).and_return("hello")
a = " world!".prepend(obj)
a.should == "hello world!"
end
it "raises a TypeError if the given argument can't be converted to a String" do
lambda { "hello ".prepend [] }.should raise_error(TypeError)
lambda { 'hello '.prepend mock('x') }.should raise_error(TypeError)
end
it "raises a RuntimeError when self is frozen" do
a = "hello"
a.freeze
lambda { a.prepend "" }.should raise_error(RuntimeError)
lambda { a.prepend "test" }.should raise_error(RuntimeError)
end
it "works when given a subclass instance" do
a = " world"
a.prepend StringSpecs::MyString.new("hello")
a.should == "hello world"
end
it "taints self if other is tainted" do
x = "x"
x.prepend("".taint).tainted?.should be_true
x = "x"
x.prepend("y".taint).tainted?.should be_true
end
ruby_version_is "2.4" do
it "takes multiple arguments" do
str = " world"
str.prepend "he", "", "llo"
str.should == "hello world"
end
it "prepends the initial value when given arguments contain 2 self" do
str = "hello"
str.prepend str, str
str.should == "hellohellohello"
end
it "returns self when given no arguments" do
str = "hello"
str.prepend.should equal(str)
str.should == "hello"
end
end
end
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