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Diffstat (limited to 'spec/ruby/core/string/delete_prefix_spec.rb')
-rw-r--r-- | spec/ruby/core/string/delete_prefix_spec.rb | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/spec/ruby/core/string/delete_prefix_spec.rb b/spec/ruby/core/string/delete_prefix_spec.rb new file mode 100644 index 0000000000..94d486eace --- /dev/null +++ b/spec/ruby/core/string/delete_prefix_spec.rb @@ -0,0 +1,81 @@ +# -*- encoding: utf-8 -*- +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes.rb', __FILE__) + +ruby_version_is '2.5' do + 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 "taints resulting strings when other is tainted" do + 'hello'.taint.delete_prefix('hell').tainted?.should == true + 'hello'.taint.delete_prefix('').tainted?.should == true + 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 "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 + + 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 RuntimeError when self is frozen" do + lambda { 'hello'.freeze.delete_prefix!('hell') }.should raise_error(RuntimeError) + lambda { 'hello'.freeze.delete_prefix!('') }.should raise_error(RuntimeError) + lambda { ''.freeze.delete_prefix!('') }.should raise_error(RuntimeError) + end + end +end |