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84 lines
2.5 KiB
Ruby
84 lines
2.5 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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describe "Enumerable#grep" do
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before :each do
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@a = EnumerableSpecs::EachDefiner.new( 2, 4, 6, 8, 10)
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end
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it "grep without a block should return an array of all elements === pattern" do
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class EnumerableSpecGrep; def ===(obj); obj == '2'; end; end
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EnumerableSpecs::Numerous.new('2', 'a', 'nil', '3', false).grep(EnumerableSpecGrep.new).should == ['2']
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end
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it "grep with a block should return an array of elements === pattern passed through block" do
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class EnumerableSpecGrep2; def ===(obj); /^ca/ =~ obj; end; end
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EnumerableSpecs::Numerous.new("cat", "coat", "car", "cadr", "cost").grep(EnumerableSpecGrep2.new) { |i| i.upcase }.should == ["CAT", "CAR", "CADR"]
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end
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it "grep the enumerable (rubycon legacy)" do
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EnumerableSpecs::EachDefiner.new().grep(1).should == []
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@a.grep(3..7).should == [4,6]
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@a.grep(3..7) {|a| a+1}.should == [5,7]
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end
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it "can use $~ in the block when used with a Regexp" do
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ary = ["aba", "aba"]
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ary.grep(/a(b)a/) { $1 }.should == ["b", "b"]
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end
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it "sets $~ in the block" do
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"z" =~ /z/ # Reset $~
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["abc", "def"].grep(/b/) { |e|
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e.should == "abc"
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$&.should == "b"
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}
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# Set by the failed match of "def"
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$~.should == nil
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end
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ruby_version_is ""..."3.0.0" do
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it "sets $~ to the last match when given no block" do
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"z" =~ /z/ # Reset $~
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["abc", "def"].grep(/b/).should == ["abc"]
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# Set by the failed match of "def"
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$~.should == nil
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["abc", "def"].grep(/e/)
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$&.should == "e"
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end
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end
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ruby_version_is "3.0.0" do
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it "does not set $~ when given no block" do
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"z" =~ /z/ # Reset $~
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["abc", "def"].grep(/b/).should == ["abc"]
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$&.should == "z"
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end
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end
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describe "with a block" do
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before :each do
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@numerous = EnumerableSpecs::Numerous.new(*(0..9).to_a)
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def (@odd_matcher = BasicObject.new).===(obj)
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obj.odd?
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end
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end
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it "returns an Array of matched elements that mapped by the block" do
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@numerous.grep(@odd_matcher) { |n| n * 2 }.should == [2, 6, 10, 14, 18]
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end
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it "calls the block with gathered array when yielded with multiple arguments" do
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EnumerableSpecs::YieldsMixed2.new.grep(Object){ |e| e }.should == EnumerableSpecs::YieldsMixed2.gathered_yields
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end
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it "raises an ArgumentError when not given a pattern" do
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-> { @numerous.grep { |e| e } }.should raise_error(ArgumentError)
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end
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end
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end
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