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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Enumerable#all?" do
before :each do
@enum = EnumerableSpecs::Numerous.new
@empty = EnumerableSpecs::Empty.new()
@enum1 = [0, 1, 2, -1]
@enum2 = [nil, false, true]
end
it "always returns true on empty enumeration" do
@empty.all?.should == true
@empty.all? { nil }.should == true
[].all?.should == true
[].all? { false }.should == true
{}.all?.should == true
{}.all? { nil }.should == true
end
it "does not hide exceptions out of #each" do
lambda {
EnumerableSpecs::ThrowingEach.new.all?
}.should raise_error(RuntimeError)
lambda {
EnumerableSpecs::ThrowingEach.new.all? { false }
}.should raise_error(RuntimeError)
end
describe "with no block" do
it "returns true if no elements are false or nil" do
@enum.all?.should == true
@enum1.all?.should == true
@enum2.all?.should == false
EnumerableSpecs::Numerous.new('a','b','c').all?.should == true
EnumerableSpecs::Numerous.new(0, "x", true).all?.should == true
end
it "returns false if there are false or nil elements" do
EnumerableSpecs::Numerous.new(false).all?.should == false
EnumerableSpecs::Numerous.new(false, false).all?.should == false
EnumerableSpecs::Numerous.new(nil).all?.should == false
EnumerableSpecs::Numerous.new(nil, nil).all?.should == false
EnumerableSpecs::Numerous.new(1, nil, 2).all?.should == false
EnumerableSpecs::Numerous.new(0, "x", false, true).all?.should == false
@enum2.all?.should == false
end
it "gathers whole arrays as elements when each yields multiple" do
multi = EnumerableSpecs::YieldsMultiWithFalse.new
multi.all?.should be_true
end
end
describe "with block" do
it "returns true if the block never returns false or nil" do
@enum.all? { true }.should == true
@enum1.all?{ |o| o < 5 }.should == true
@enum1.all?{ |o| 5 }.should == true
end
it "returns false if the block ever returns false or nil" do
@enum.all? { false }.should == false
@enum.all? { nil }.should == false
@enum1.all?{ |o| o > 2 }.should == false
EnumerableSpecs::Numerous.new.all? { |i| i > 5 }.should == false
EnumerableSpecs::Numerous.new.all? { |i| i == 3 ? nil : true }.should == false
end
it "stops iterating once the return value is determined" do
yielded = []
EnumerableSpecs::Numerous.new(:one, :two, :three).all? do |e|
yielded << e
false
end.should == false
yielded.should == [:one]
yielded = []
EnumerableSpecs::Numerous.new(true, true, false, true).all? do |e|
yielded << e
e
end.should == false
yielded.should == [true, true, false]
yielded = []
EnumerableSpecs::Numerous.new(1, 2, 3, 4, 5).all? do |e|
yielded << e
e
end.should == true
yielded.should == [1, 2, 3, 4, 5]
end
it "does not hide exceptions out of the block" do
lambda {
@enum.all? { raise "from block" }
}.should raise_error(RuntimeError)
end
it "gathers initial args as elements when each yields multiple" do
multi = EnumerableSpecs::YieldsMulti.new
multi.all? {|e| !(Array === e) }.should be_true
end
it "yields multiple arguments when each yields multiple" do
multi = EnumerableSpecs::YieldsMulti.new
yielded = []
multi.all? {|e, i| yielded << [e, i] }
yielded.should == [[1, 2], [3, 4], [6, 7]]
end
end
end
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