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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerable#any?" do
before :each do
@enum = EnumerableSpecs::Numerous.new
@empty = EnumerableSpecs::Empty.new
@enum1 = EnumerableSpecs::Numerous.new(0, 1, 2, -1)
@enum2 = EnumerableSpecs::Numerous.new(nil, false, true)
end
it "always returns false on empty enumeration" do
@empty.should_not.any?
@empty.any? { nil }.should == false
[].should_not.any?
[].any? { false }.should == false
{}.should_not.any?
{}.any? { nil }.should == false
end
it "raises an ArgumentError when more than 1 argument is provided" do
-> { @enum.any?(1, 2, 3) }.should raise_error(ArgumentError)
-> { [].any?(1, 2, 3) }.should raise_error(ArgumentError)
-> { {}.any?(1, 2, 3) }.should raise_error(ArgumentError)
end
it "does not hide exceptions out of #each" do
-> {
EnumerableSpecs::ThrowingEach.new.any?
}.should raise_error(RuntimeError)
-> {
EnumerableSpecs::ThrowingEach.new.any? { false }
}.should raise_error(RuntimeError)
end
describe "with no block" do
it "returns true if any element is not false or nil" do
@enum.should.any?
@enum1.should.any?
@enum2.should.any?
EnumerableSpecs::Numerous.new(true).should.any?
EnumerableSpecs::Numerous.new('a','b','c').should.any?
EnumerableSpecs::Numerous.new('a','b','c', nil).should.any?
EnumerableSpecs::Numerous.new(1, nil, 2).should.any?
EnumerableSpecs::Numerous.new(1, false).should.any?
EnumerableSpecs::Numerous.new(false, nil, 1, false).should.any?
EnumerableSpecs::Numerous.new(false, 0, nil).should.any?
end
it "returns false if all elements are false or nil" do
EnumerableSpecs::Numerous.new(false).should_not.any?
EnumerableSpecs::Numerous.new(false, false).should_not.any?
EnumerableSpecs::Numerous.new(nil).should_not.any?
EnumerableSpecs::Numerous.new(nil, nil).should_not.any?
EnumerableSpecs::Numerous.new(nil, false, nil).should_not.any?
end
it "gathers whole arrays as elements when each yields multiple" do
multi = EnumerableSpecs::YieldsMultiWithFalse.new
multi.any?.should be_true
end
end
describe "with block" do
it "returns true if the block ever returns other than false or nil" do
@enum.any? { true }.should == true
@enum.any? { 0 }.should == true
@enum.any? { 1 }.should == true
@enum1.any? { Object.new }.should == true
@enum1.any?{ |o| o < 1 }.should == true
@enum1.any?{ |o| 5 }.should == true
@enum2.any? { |i| i == nil }.should == true
end
it "returns false if the block never returns other than false or nil" do
@enum.any? { false }.should == false
@enum.any? { nil }.should == false
@enum1.any?{ |o| o < -10 }.should == false
@enum1.any?{ |o| nil }.should == false
@enum2.any? { |i| i == :stuff }.should == false
end
it "stops iterating once the return value is determined" do
yielded = []
EnumerableSpecs::Numerous.new(:one, :two, :three).any? do |e|
yielded << e
false
end.should == false
yielded.should == [:one, :two, :three]
yielded = []
EnumerableSpecs::Numerous.new(true, true, false, true).any? do |e|
yielded << e
e
end.should == true
yielded.should == [true]
yielded = []
EnumerableSpecs::Numerous.new(false, nil, false, true, false).any? do |e|
yielded << e
e
end.should == true
yielded.should == [false, nil, false, true]
yielded = []
EnumerableSpecs::Numerous.new(1, 2, 3, 4, 5).any? do |e|
yielded << e
e
end.should == true
yielded.should == [1]
end
it "does not hide exceptions out of the block" do
-> {
@enum.any? { 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.any? { |e| yielded << e; false }.should == false
yielded.should == [1, 3, 6]
end
it "yields multiple arguments when each yields multiple" do
multi = EnumerableSpecs::YieldsMulti.new
yielded = []
multi.any? { |*args| yielded << args; false }.should == 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 == 2 }
@enum1.any?(pattern).should == true
pattern.yielded.should == [[0], [1], [2]]
end
it "always returns false on empty enumeration" do
@empty.any?(Integer).should == false
[].any?(Integer).should == false
{}.any?(NilClass).should == false
end
it "does not hide exceptions out of #each" do
-> {
EnumerableSpecs::ThrowingEach.new.any?(Integer)
}.should raise_error(RuntimeError)
end
it "returns true if the pattern ever returns a truthy value" do
@enum2.any?(NilClass).should == true
pattern = EnumerableSpecs::Pattern.new { |x| 42 }
@enum.any?(pattern).should == true
[1, 42, 3].any?(pattern).should == true
pattern = EnumerableSpecs::Pattern.new { |x| x == [:b, 2] }
{a: 1, b: 2}.any?(pattern).should == true
end
it "returns false if the block never returns other than false or nil" do
pattern = EnumerableSpecs::Pattern.new { |x| nil }
@enum1.any?(pattern).should == false
pattern.yielded.should == [[0], [1], [2], [-1]]
[1, 2, 3].any?(pattern).should == false
{a: 1}.any?(pattern).should == false
end
it "does not hide exceptions out of pattern#===" do
pattern = EnumerableSpecs::Pattern.new { raise "from pattern" }
-> {
@enum.any?(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.any?(pattern).should == false
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).any?(String) { true }.should == false
}.should complain(/given block not used/)
end
end
end
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