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401b64c4e8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
108 lines
3.3 KiB
Ruby
108 lines
3.3 KiB
Ruby
# -*- encoding: utf-8 -*-
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require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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describe "String#<=> with String" do
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it "compares individual characters based on their ascii value" do
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ascii_order = Array.new(256) { |x| x.chr }
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sort_order = ascii_order.sort
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sort_order.should == ascii_order
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end
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it "returns -1 when self is less than other" do
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("this" <=> "those").should == -1
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end
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it "returns 0 when self is equal to other" do
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("yep" <=> "yep").should == 0
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end
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it "returns 1 when self is greater than other" do
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("yoddle" <=> "griddle").should == 1
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end
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it "considers string that comes lexicographically first to be less if strings have same size" do
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("aba" <=> "abc").should == -1
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("abc" <=> "aba").should == 1
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end
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it "doesn't consider shorter string to be less if longer string starts with shorter one" do
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("abc" <=> "abcd").should == -1
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("abcd" <=> "abc").should == 1
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end
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it "compares shorter string with corresponding number of first chars of longer string" do
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("abx" <=> "abcd").should == 1
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("abcd" <=> "abx").should == -1
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end
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it "ignores subclass differences" do
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a = "hello"
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b = StringSpecs::MyString.new("hello")
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(a <=> b).should == 0
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(b <=> a).should == 0
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end
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it "returns 0 if self and other are bytewise identical and have the same encoding" do
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("ÄÖÜ" <=> "ÄÖÜ").should == 0
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end
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it "returns 0 if self and other are bytewise identical and have the same encoding" do
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("ÄÖÜ" <=> "ÄÖÜ").should == 0
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end
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it "returns -1 if self is bytewise less than other" do
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("ÄÖÛ" <=> "ÄÖÜ").should == -1
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end
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it "returns 1 if self is bytewise greater than other" do
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("ÄÖÜ" <=> "ÄÖÛ").should == 1
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end
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it "ignores encoding difference" do
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("ÄÖÛ".force_encoding("utf-8") <=> "ÄÖÜ".force_encoding("iso-8859-1")).should == -1
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("ÄÖÜ".force_encoding("utf-8") <=> "ÄÖÛ".force_encoding("iso-8859-1")).should == 1
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end
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it "returns 0 with identical ASCII-compatible bytes of different encodings" do
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("abc".force_encoding("utf-8") <=> "abc".force_encoding("iso-8859-1")).should == 0
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end
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it "compares the indices of the encodings when the strings have identical non-ASCII-compatible bytes" do
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xff_1 = [0xFF].pack('C').force_encoding("utf-8")
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xff_2 = [0xFF].pack('C').force_encoding("iso-8859-1")
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(xff_1 <=> xff_2).should == -1
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(xff_2 <=> xff_1).should == 1
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end
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end
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# Note: This is inconsistent with Array#<=> which calls #to_ary instead of
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# just using it as an indicator.
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describe "String#<=>" do
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it "returns nil if its argument provides neither #to_str nor #<=>" do
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("abc" <=> mock('x')).should be_nil
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end
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it "uses the result of calling #to_str for comparison when #to_str is defined" do
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obj = mock('x')
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obj.should_receive(:to_str).and_return("aaa")
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("abc" <=> obj).should == 1
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end
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it "uses the result of calling #<=> on its argument when #<=> is defined but #to_str is not" do
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obj = mock('x')
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obj.should_receive(:<=>).and_return(-1)
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("abc" <=> obj).should == 1
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end
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it "returns nil if argument also uses an inverse comparison for <=>" do
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obj = mock('x')
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def obj.<=>(other); other <=> self; end
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obj.should_receive(:<=>).once
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("abc" <=> obj).should be_nil
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end
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end
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