1describe :enumerable_take, shared: true do
2  before :each do
3    @values = [4,3,2,1,0,-1]
4    @enum = EnumerableSpecs::Numerous.new(*@values)
5  end
6
7  it "returns the first count elements if given a count" do
8    @enum.send(@method, 2).should == [4, 3]
9    @enum.send(@method, 4).should == [4, 3, 2, 1] # See redmine #1686 !
10  end
11
12  it "returns an empty array when passed count on an empty array" do
13    empty = EnumerableSpecs::Empty.new
14    empty.send(@method, 0).should == []
15    empty.send(@method, 1).should == []
16    empty.send(@method, 2).should == []
17  end
18
19  it "returns an empty array when passed count == 0" do
20    @enum.send(@method, 0).should == []
21  end
22
23  it "returns an array containing the first element when passed count == 1" do
24    @enum.send(@method, 1).should == [4]
25  end
26
27  it "raises an ArgumentError when count is negative" do
28    lambda { @enum.send(@method, -1) }.should raise_error(ArgumentError)
29  end
30
31  it "returns the entire array when count > length" do
32    @enum.send(@method, 100).should == @values
33    @enum.send(@method, 8).should == @values  # See redmine #1686 !
34  end
35
36  it "tries to convert the passed argument to an Integer using #to_int" do
37    obj = mock('to_int')
38    obj.should_receive(:to_int).and_return(3).at_most(:twice) # called twice, no apparent reason. See redmine #1554
39    @enum.send(@method, obj).should == [4, 3, 2]
40  end
41
42  it "raises a TypeError if the passed argument is not numeric" do
43    lambda { @enum.send(@method, nil) }.should raise_error(TypeError)
44    lambda { @enum.send(@method, "a") }.should raise_error(TypeError)
45
46    obj = mock("nonnumeric")
47    lambda { @enum.send(@method, obj) }.should raise_error(TypeError)
48  end
49
50  it "gathers whole arrays as elements when each yields multiple" do
51    multi = EnumerableSpecs::YieldsMulti.new
52    multi.send(@method, 1).should == [[1, 2]]
53  end
54
55  it "consumes only what is needed" do
56    thrower = EnumerableSpecs::ThrowingEach.new
57    thrower.send(@method, 0).should == []
58    counter = EnumerableSpecs::EachCounter.new(1,2,3,4)
59    counter.send(@method, 2).should == [1,2]
60    counter.times_called.should == 1
61    counter.times_yielded.should == 2
62  end
63end
64