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# encoding: utf-8
require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "String#reverse" do
it "returns a new string with the characters of self in reverse order" do
"stressed".reverse.should == "desserts"
"m".reverse.should == "m"
"".reverse.should == ""
end
it "returns String instances when called on a subclass" do
StringSpecs::MyString.new("stressed").reverse.should be_an_instance_of(String)
StringSpecs::MyString.new("m").reverse.should be_an_instance_of(String)
StringSpecs::MyString.new("").reverse.should be_an_instance_of(String)
end
it "reverses a string with multi byte characters" do
"微軟正黑體".reverse.should == "體黑正軟微"
end
it "works with a broken string" do
str = "微軟\xDF\xDE正黑體".force_encoding(Encoding::UTF_8)
str.valid_encoding?.should be_false
str.reverse.should == "體黑正\xDE\xDF軟微"
end
it "returns a String in the same encoding as self" do
"stressed".encode("US-ASCII").reverse.encoding.should == Encoding::US_ASCII
end
end
describe "String#reverse!" do
it "reverses self in place and always returns self" do
a = "stressed"
a.reverse!.should equal(a)
a.should == "desserts"
"".reverse!.should == ""
end
it "raises a FrozenError on a frozen instance that is modified" do
-> { "anna".freeze.reverse! }.should raise_error(FrozenError)
-> { "hello".freeze.reverse! }.should raise_error(FrozenError)
end
# see [ruby-core:23666]
it "raises a FrozenError on a frozen instance that would not be modified" do
-> { "".freeze.reverse! }.should raise_error(FrozenError)
end
it "reverses a string with multi byte characters" do
str = "微軟正黑體"
str.reverse!
str.should == "體黑正軟微"
end
it "works with a broken string" do
str = "微軟\xDF\xDE正黑體".force_encoding(Encoding::UTF_8)
str.valid_encoding?.should be_false
str.reverse!
str.should == "體黑正\xDE\xDF軟微"
end
end
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