1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
require "spec_helper"
require "hamster/vector"
describe Hamster::Vector do
describe "#drop_while" do
[
[[], []],
[["A"], []],
[%w[A B C], ["C"]],
].each do |values, expected|
describe "on #{values.inspect}" do
let(:vector) { V[*values] }
describe "with a block" do
let(:result) { vector.drop_while { |item| item < "C" } }
it "preserves the original" do
result
vector.should eql(V[*values])
end
it "returns #{expected.inspect}" do
result.should eql(V[*expected])
end
end
describe "without a block" do
it "returns an Enumerator" do
vector.drop_while.class.should be(Enumerator)
vector.drop_while.each { |item| item < "C" }.should eql(V[*expected])
end
end
end
end
context "on an empty vector" do
it "returns an empty vector" do
V.empty.drop_while { false }.should eql(V.empty)
end
end
it "returns an empty vector if block is always true" do
V.new(1..32).drop_while { true }.should eql(V.empty)
V.new(1..100).drop_while { true }.should eql(V.empty)
end
it "stops dropping items if block returns nil" do
V[1, 2, 3, nil, 4, 5].drop_while { |x| x }.should eql(V[nil, 4, 5])
end
it "stops dropping items if block returns false" do
V[1, 2, 3, false, 4, 5].drop_while { |x| x }.should eql(V[false, 4, 5])
end
end
end
|
