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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Hash#compact" do
before :each do
@hash = { truthy: true, false: false, nil: nil, nil => true }
@initial_pairs = @hash.dup
@compact = { truthy: true, false: false, nil => true }
end
it "returns new object that rejects pair has nil value" do
ret = @hash.compact
ret.should_not equal(@hash)
ret.should == @compact
end
it "keeps own pairs" do
@hash.compact
@hash.should == @initial_pairs
end
ruby_version_is '3.3' do
it "retains the default value" do
hash = Hash.new(1)
hash.compact.default.should == 1
hash[:a] = 1
hash.compact.default.should == 1
end
it "retains the default_proc" do
pr = proc { |h, k| h[k] = [] }
hash = Hash.new(&pr)
hash.compact.default_proc.should == pr
hash[:a] = 1
hash.compact.default_proc.should == pr
end
it "retains compare_by_identity_flag" do
hash = {}.compare_by_identity
hash.compact.compare_by_identity?.should == true
hash[:a] = 1
hash.compact.compare_by_identity?.should == true
end
end
end
describe "Hash#compact!" do
before :each do
@hash = { truthy: true, false: false, nil: nil, nil => true }
@initial_pairs = @hash.dup
@compact = { truthy: true, false: false, nil => true }
end
it "returns self" do
@hash.compact!.should equal(@hash)
end
it "rejects own pair has nil value" do
@hash.compact!
@hash.should == @compact
end
context "when each pair does not have nil value" do
before :each do
@hash.compact!
end
it "returns nil" do
@hash.compact!.should be_nil
end
end
describe "on frozen instance" do
before :each do
@hash.freeze
end
it "keeps pairs and raises a FrozenError" do
->{ @hash.compact! }.should raise_error(FrozenError)
@hash.should == @initial_pairs
end
end
end
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