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# -*- encoding: utf-8 -*-
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "String#delete_prefix" do
it "returns a copy of the string, with the given prefix removed" do
'hello'.delete_prefix('hell').should == 'o'
'hello'.delete_prefix('hello').should == ''
end
it "returns a copy of the string, when the prefix isn't found" do
s = 'hello'
r = s.delete_prefix('hello!')
r.should_not equal s
r.should == s
r = s.delete_prefix('ell')
r.should_not equal s
r.should == s
r = s.delete_prefix('')
r.should_not equal s
r.should == s
end
it "does not remove partial bytes, only full characters" do
"\xe3\x81\x82".delete_prefix("\xe3").should == "\xe3\x81\x82"
end
it "doesn't set $~" do
$~ = nil
'hello'.delete_prefix('hell')
$~.should == nil
end
it "calls to_str on its argument" do
o = mock('x')
o.should_receive(:to_str).and_return 'hell'
'hello'.delete_prefix(o).should == 'o'
end
ruby_version_is ''...'3.0' do
it "returns a subclass instance when called on a subclass instance" do
s = StringSpecs::MyString.new('hello')
s.delete_prefix('hell').should be_an_instance_of(StringSpecs::MyString)
end
end
ruby_version_is '3.0' do
it "returns a String instance when called on a subclass instance" do
s = StringSpecs::MyString.new('hello')
s.delete_prefix('hell').should be_an_instance_of(String)
end
end
it "returns a String in the same encoding as self" do
'hello'.encode("US-ASCII").delete_prefix('hell').encoding.should == Encoding::US_ASCII
end
end
describe "String#delete_prefix!" do
it "removes the found prefix" do
s = 'hello'
s.delete_prefix!('hell').should equal(s)
s.should == 'o'
end
it "returns nil if no change is made" do
s = 'hello'
s.delete_prefix!('ell').should == nil
s.delete_prefix!('').should == nil
end
it "doesn't set $~" do
$~ = nil
'hello'.delete_prefix!('hell')
$~.should == nil
end
it "calls to_str on its argument" do
o = mock('x')
o.should_receive(:to_str).and_return 'hell'
'hello'.delete_prefix!(o).should == 'o'
end
it "raises a FrozenError when self is frozen" do
-> { 'hello'.freeze.delete_prefix!('hell') }.should raise_error(FrozenError)
-> { 'hello'.freeze.delete_prefix!('') }.should raise_error(FrozenError)
-> { ''.freeze.delete_prefix!('') }.should raise_error(FrozenError)
end
end
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