ruby--ruby/spec/ruby/core/string/strip_spec.rb

require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes.rb', __FILE__)

describe "String#strip" do
  it "returns a new string with leading and trailing whitespace removed" do
    "   hello   ".strip.should == "hello"
    "   hello world   ".strip.should == "hello world"
    "\tgoodbye\r\v\n".strip.should == "goodbye"
    "\x00 goodbye \x00".strip.should == "\x00 goodbye"
  end

  it "returns a copy of self with trailing NULL bytes and whitespace" do
    " \x00 goodbye \x00 ".strip.should == "\x00 goodbye"
  end

  it "taints the result when self is tainted" do
    "".taint.strip.tainted?.should == true
    "ok".taint.strip.tainted?.should == true
    "  ok  ".taint.strip.tainted?.should == true
  end
end

describe "String#strip!" do
  it "modifies self in place and returns self" do
    a = "   hello   "
    a.strip!.should equal(a)
    a.should == "hello"

    a = "\tgoodbye\r\v\n"
    a.strip!
    a.should == "goodbye"

    a = "\000 goodbye \000"
    a.strip!
    a.should == "\000 goodbye"

  end

  it "returns nil if no modifications where made" do
    a = "hello"
    a.strip!.should == nil
    a.should == "hello"
  end

  it "modifies self removing trailing NULL bytes and whitespace" do
    a = " \x00 goodbye \x00 "
    a.strip!
    a.should == "\x00 goodbye"
  end

  it "raises a RuntimeError on a frozen instance that is modified" do
    lambda { "  hello  ".freeze.strip! }.should raise_error(RuntimeError)
  end

  # see #1552
  it "raises a RuntimeError on a frozen instance that would not be modified" do
    lambda {"hello".freeze.strip! }.should raise_error(RuntimeError)
    lambda {"".freeze.strip!      }.should raise_error(RuntimeError)
  end
end