require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Enumerable#none?" do before :each do @empty = EnumerableSpecs::Empty.new @enum = EnumerableSpecs::Numerous.new @enum1 = EnumerableSpecs::Numerous.new(0, 1, 2, -1) @enum2 = EnumerableSpecs::Numerous.new(nil, false, true) end it "always returns true on empty enumeration" do @empty.should.none? @empty.none? { true }.should == true end it "raises an ArgumentError when more than 1 argument is provided" do -> { @enum.none?(1, 2, 3) }.should raise_error(ArgumentError) -> { [].none?(1, 2, 3) }.should raise_error(ArgumentError) -> { {}.none?(1, 2, 3) }.should raise_error(ArgumentError) end it "does not hide exceptions out of #each" do -> { EnumerableSpecs::ThrowingEach.new.none? }.should raise_error(RuntimeError) -> { EnumerableSpecs::ThrowingEach.new.none? { false } }.should raise_error(RuntimeError) end describe "with no block" do it "returns true if none of the elements in self are true" do e = EnumerableSpecs::Numerous.new(false, nil, false) e.none?.should be_true end it "returns false if at least one of the elements in self are true" do e = EnumerableSpecs::Numerous.new(false, nil, true, false) e.none?.should be_false end it "gathers whole arrays as elements when each yields multiple" do multi = EnumerableSpecs::YieldsMultiWithFalse.new multi.none?.should be_false end end describe "with a block" do before :each do @e = EnumerableSpecs::Numerous.new(1,1,2,3,4) end it "passes each element to the block in turn until it returns true" do acc = [] @e.none? {|e| acc << e; false } acc.should == [1,1,2,3,4] end it "stops passing elements to the block when it returns true" do acc = [] @e.none? {|e| acc << e; e == 3 ? true : false } acc.should == [1,1,2,3] end it "returns true if the block never returns true" do @e.none? {|e| false }.should be_true end it "returns false if the block ever returns true" do @e.none? {|e| e == 3 ? true : false }.should be_false end it "does not hide exceptions out of the block" do -> { @enum.none? { raise "from block" } }.should raise_error(RuntimeError) end it "gathers initial args as elements when each yields multiple" do multi = EnumerableSpecs::YieldsMulti.new yielded = [] multi.none? { |e| yielded << e; false } yielded.should == [1, 3, 6] end it "yields multiple arguments when each yields multiple" do multi = EnumerableSpecs::YieldsMulti.new yielded = [] multi.none? { |*args| yielded << args; false } yielded.should == [[1, 2], [3, 4, 5], [6, 7, 8, 9]] end end describe 'when given a pattern argument' do it "calls `===` on the pattern the return value " do pattern = EnumerableSpecs::Pattern.new { |x| x == 3 } @enum1.none?(pattern).should == true pattern.yielded.should == [[0], [1], [2], [-1]] end # may raise an exception in future versions ruby_version_is ""..."2.6" do it "ignores block" do @enum2.none?(Integer) { raise }.should == true [1, 2, nil].none?(TrueClass) { raise }.should == true {a: 1}.none?(Hash) { raise }.should == true end end it "always returns true on empty enumeration" do @empty.none?(Integer).should == true [].none?(Integer).should == true {}.none?(NilClass).should == true end it "does not hide exceptions out of #each" do -> { EnumerableSpecs::ThrowingEach.new.none?(Integer) }.should raise_error(RuntimeError) end it "returns true if the pattern never returns a truthy value" do @enum2.none?(Integer).should == true pattern = EnumerableSpecs::Pattern.new { |x| nil } @enum.none?(pattern).should == true [1, 42, 3].none?(pattern).should == true {a: 1, b: 2}.none?(pattern).should == true end it "returns false if the pattern ever returns other than false or nil" do pattern = EnumerableSpecs::Pattern.new { |x| x < 0 } @enum1.none?(pattern).should == false pattern.yielded.should == [[0], [1], [2], [-1]] [1, 2, 3, -1].none?(pattern).should == false {a: 1}.none?(Array).should == false end it "does not hide exceptions out of pattern#===" do pattern = EnumerableSpecs::Pattern.new { raise "from pattern" } -> { @enum.none?(pattern) }.should raise_error(RuntimeError) end it "calls the pattern with gathered array when yielded with multiple arguments" do multi = EnumerableSpecs::YieldsMulti.new pattern = EnumerableSpecs::Pattern.new { false } multi.none?(pattern).should == true pattern.yielded.should == [[[1, 2]], [[3, 4, 5]], [[6, 7, 8, 9]]] end end end