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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
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
it "ignores the block if there is an argument" do
-> {
EnumerableSpecs::Numerous.new(1, 2, 3, 4, 5).none?(String) { true }.should == true
}.should complain(/given block not used/)
end
end
end
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