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# -*- encoding: utf-8 -*-
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes.rb', __FILE__)
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
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
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