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a34db218ad
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61504 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
88 lines
3.1 KiB
Ruby
88 lines
3.1 KiB
Ruby
# -*- encoding: binary -*-
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describe :string_succ, shared: true do
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it "returns an empty string for empty strings" do
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"".send(@method).should == ""
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end
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it "returns the successor by increasing the rightmost alphanumeric (digit => digit, letter => letter with same case)" do
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"abcd".send(@method).should == "abce"
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"THX1138".send(@method).should == "THX1139"
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"<<koala>>".send(@method).should == "<<koalb>>"
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"==A??".send(@method).should == "==B??"
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end
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it "increases non-alphanumerics (via ascii rules) if there are no alphanumerics" do
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"***".send(@method).should == "**+"
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"**`".send(@method).should == "**a"
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end
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it "increases the next best alphanumeric (jumping over non-alphanumerics) if there is a carry" do
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"dz".send(@method).should == "ea"
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"HZ".send(@method).should == "IA"
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"49".send(@method).should == "50"
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"izz".send(@method).should == "jaa"
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"IZZ".send(@method).should == "JAA"
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"699".send(@method).should == "700"
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"6Z99z99Z".send(@method).should == "7A00a00A"
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"1999zzz".send(@method).should == "2000aaa"
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"NZ/[]ZZZ9999".send(@method).should == "OA/[]AAA0000"
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end
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it "increases the next best character if there is a carry for non-alphanumerics" do
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"(\xFF".send(@method).should == ")\x00"
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"`\xFF".send(@method).should == "a\x00"
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"<\xFF\xFF".send(@method).should == "=\x00\x00"
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end
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it "adds an additional character (just left to the last increased one) if there is a carry and no character left to increase" do
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"z".send(@method).should == "aa"
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"Z".send(@method).should == "AA"
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"9".send(@method).should == "10"
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"zz".send(@method).should == "aaa"
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"ZZ".send(@method).should == "AAA"
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"99".send(@method).should == "100"
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"9Z99z99Z".send(@method).should == "10A00a00A"
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"ZZZ9999".send(@method).should == "AAAA0000"
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"/[]9999".send(@method).should == "/[]10000"
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"/[]ZZZ9999".send(@method).should == "/[]AAAA0000"
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"Z/[]ZZZ9999".send(@method).should == "AA/[]AAA0000"
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# non-alphanumeric cases
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"\xFF".send(@method).should == "\x01\x00"
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"\xFF\xFF".send(@method).should == "\x01\x00\x00"
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end
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it "returns subclass instances when called on a subclass" do
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StringSpecs::MyString.new("").send(@method).should be_an_instance_of(StringSpecs::MyString)
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StringSpecs::MyString.new("a").send(@method).should be_an_instance_of(StringSpecs::MyString)
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StringSpecs::MyString.new("z").send(@method).should be_an_instance_of(StringSpecs::MyString)
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end
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it "taints the result if self is tainted" do
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["", "a", "z", "Z", "9", "\xFF", "\xFF\xFF"].each do |s|
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s.taint.send(@method).tainted?.should == true
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end
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end
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end
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describe :string_succ_bang, shared: true do
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it "is equivalent to succ, but modifies self in place (still returns self)" do
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["", "abcd", "THX1138"].each do |s|
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r = s.dup.send(@method)
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s.send(@method).should equal(s)
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s.should == r
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end
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end
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it "raises a #{frozen_error_class} if self is frozen" do
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lambda { "".freeze.send(@method) }.should raise_error(frozen_error_class)
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lambda { "abcd".freeze.send(@method) }.should raise_error(frozen_error_class)
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end
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end
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