mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
112 lines
3.4 KiB
Ruby
112 lines
3.4 KiB
Ruby
# -*- encoding: utf-8 -*-
|
|
require_relative '../../spec_helper'
|
|
require_relative 'fixtures/classes'
|
|
|
|
describe "String#<=> with String" do
|
|
it "compares individual characters based on their ascii value" do
|
|
ascii_order = Array.new(256) { |x| x.chr }
|
|
sort_order = ascii_order.sort
|
|
sort_order.should == ascii_order
|
|
end
|
|
|
|
it "returns -1 when self is less than other" do
|
|
("this" <=> "those").should == -1
|
|
end
|
|
|
|
it "returns 0 when self is equal to other" do
|
|
("yep" <=> "yep").should == 0
|
|
end
|
|
|
|
it "returns 1 when self is greater than other" do
|
|
("yoddle" <=> "griddle").should == 1
|
|
end
|
|
|
|
it "considers string that comes lexicographically first to be less if strings have same size" do
|
|
("aba" <=> "abc").should == -1
|
|
("abc" <=> "aba").should == 1
|
|
end
|
|
|
|
it "doesn't consider shorter string to be less if longer string starts with shorter one" do
|
|
("abc" <=> "abcd").should == -1
|
|
("abcd" <=> "abc").should == 1
|
|
end
|
|
|
|
it "compares shorter string with corresponding number of first chars of longer string" do
|
|
("abx" <=> "abcd").should == 1
|
|
("abcd" <=> "abx").should == -1
|
|
end
|
|
|
|
it "ignores subclass differences" do
|
|
a = "hello"
|
|
b = StringSpecs::MyString.new("hello")
|
|
|
|
(a <=> b).should == 0
|
|
(b <=> a).should == 0
|
|
end
|
|
|
|
it "returns 0 if self and other are bytewise identical and have the same encoding" do
|
|
("ÄÖÜ" <=> "ÄÖÜ").should == 0
|
|
end
|
|
|
|
it "returns 0 if self and other are bytewise identical and have the same encoding" do
|
|
("ÄÖÜ" <=> "ÄÖÜ").should == 0
|
|
end
|
|
|
|
it "returns -1 if self is bytewise less than other" do
|
|
("ÄÖÛ" <=> "ÄÖÜ").should == -1
|
|
end
|
|
|
|
it "returns 1 if self is bytewise greater than other" do
|
|
("ÄÖÜ" <=> "ÄÖÛ").should == 1
|
|
end
|
|
|
|
it "ignores encoding difference" do
|
|
("ÄÖÛ".force_encoding("utf-8") <=> "ÄÖÜ".force_encoding("iso-8859-1")).should == -1
|
|
("ÄÖÜ".force_encoding("utf-8") <=> "ÄÖÛ".force_encoding("iso-8859-1")).should == 1
|
|
end
|
|
|
|
it "returns 0 with identical ASCII-compatible bytes of different encodings" do
|
|
("abc".force_encoding("utf-8") <=> "abc".force_encoding("iso-8859-1")).should == 0
|
|
end
|
|
|
|
it "compares the indices of the encodings when the strings have identical non-ASCII-compatible bytes" do
|
|
xff_1 = [0xFF].pack('C').force_encoding("utf-8")
|
|
xff_2 = [0xFF].pack('C').force_encoding("iso-8859-1")
|
|
(xff_1 <=> xff_2).should == -1
|
|
(xff_2 <=> xff_1).should == 1
|
|
end
|
|
|
|
it "returns 0 when comparing 2 empty strings but one is not ASCII-compatible" do
|
|
("" <=> "".force_encoding('iso-2022-jp')).should == 0
|
|
end
|
|
end
|
|
|
|
# Note: This is inconsistent with Array#<=> which calls #to_ary instead of
|
|
# just using it as an indicator.
|
|
describe "String#<=>" do
|
|
it "returns nil if its argument provides neither #to_str nor #<=>" do
|
|
("abc" <=> mock('x')).should be_nil
|
|
end
|
|
|
|
it "uses the result of calling #to_str for comparison when #to_str is defined" do
|
|
obj = mock('x')
|
|
obj.should_receive(:to_str).and_return("aaa")
|
|
|
|
("abc" <=> obj).should == 1
|
|
end
|
|
|
|
it "uses the result of calling #<=> on its argument when #<=> is defined but #to_str is not" do
|
|
obj = mock('x')
|
|
obj.should_receive(:<=>).and_return(-1)
|
|
|
|
("abc" <=> obj).should == 1
|
|
end
|
|
|
|
it "returns nil if argument also uses an inverse comparison for <=>" do
|
|
obj = mock('x')
|
|
def obj.<=>(other); other <=> self; end
|
|
obj.should_receive(:<=>).once
|
|
|
|
("abc" <=> obj).should be_nil
|
|
end
|
|
end
|