1describe :array_index, shared: true do
2  it "returns the index of the first element == to object" do
3    x = mock('3')
4    def x.==(obj) 3 == obj; end
5
6    [2, x, 3, 1, 3, 1].send(@method, 3).should == 1
7    [2, 3.0, 3, x, 1, 3, 1].send(@method, x).should == 1
8  end
9
10  it "returns 0 if first element == to object" do
11    [2, 1, 3, 2, 5].send(@method, 2).should == 0
12  end
13
14  it "returns size-1 if only last element == to object" do
15    [2, 1, 3, 1, 5].send(@method, 5).should == 4
16  end
17
18  it "returns nil if no element == to object" do
19    [2, 1, 1, 1, 1].send(@method, 3).should == nil
20  end
21
22  it "accepts a block instead of an argument" do
23    [4, 2, 1, 5, 1, 3].send(@method) {|x| x < 2}.should == 2
24  end
25
26  it "ignores the block if there is an argument" do
27    -> {
28      [4, 2, 1, 5, 1, 3].send(@method, 5) {|x| x < 2}.should == 3
29    }.should complain(/given block not used/)
30  end
31
32  describe "given no argument and no block" do
33    it "produces an Enumerator" do
34      [].send(@method).should be_an_instance_of(Enumerator)
35    end
36  end
37end
38