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
|
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/iteration', __FILE__)
require File.expand_path('../../enumerable/shared/enumeratorized', __FILE__)
describe "Hash#keep_if" do
it "yields two arguments: key and value" do
all_args = []
{ 1 => 2, 3 => 4 }.keep_if { |*args| all_args << args }
all_args.should == [[1, 2], [3, 4]]
end
it "keeps every entry for which block is true and returns self" do
h = { a: 1, b: 2, c: 3, d: 4 }
h.keep_if { |k,v| v % 2 == 0 }.should equal(h)
h.should == { b: 2, d: 4 }
end
it "removes all entries if the block is false" do
h = { a: 1, b: 2, c: 3 }
h.keep_if { |k,v| false }.should equal(h)
h.should == {}
end
it "returns self even if unmodified" do
h = { 1 => 2, 3 => 4 }
h.keep_if { true }.should equal(h)
end
it "raises a RuntimeError if called on a frozen instance" do
lambda { HashSpecs.frozen_hash.keep_if { true } }.should raise_error(RuntimeError)
lambda { HashSpecs.empty_frozen_hash.keep_if { false } }.should raise_error(RuntimeError)
end
it_behaves_like(:hash_iteration_no_block, :keep_if)
it_behaves_like(:enumeratorized_with_origin_size, :keep_if, { 1 => 2, 3 => 4, 5 => 6 })
end
|
