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3fa5bd38af
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62094 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
100 lines
3.2 KiB
Ruby
100 lines
3.2 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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require File.expand_path('../fixtures/classes', __FILE__)
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require File.expand_path('../shared/iteration', __FILE__)
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require File.expand_path('../../enumerable/shared/enumeratorized', __FILE__)
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describe "Hash#reject" do
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it "returns a new hash removing keys for which the block yields true" do
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h = { 1=>false, 2=>true, 3=>false, 4=>true }
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h.reject { |k,v| v }.keys.sort.should == [1,3]
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end
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it "is equivalent to hsh.dup.delete_if" do
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h = { a: 'a', b: 'b', c: 'd' }
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h.reject { |k,v| k == 'd' }.should == (h.dup.delete_if { |k, v| k == 'd' })
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all_args_reject = []
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all_args_delete_if = []
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h = { 1 => 2, 3 => 4 }
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h.reject { |*args| all_args_reject << args }
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h.delete_if { |*args| all_args_delete_if << args }
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all_args_reject.should == all_args_delete_if
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h = { 1 => 2 }
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# dup doesn't copy singleton methods
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def h.to_a() end
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h.reject { false }.to_a.should == [[1, 2]]
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end
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context "with extra state" do
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it "returns Hash instance for subclasses" do
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HashSpecs::MyHash[1 => 2, 3 => 4].reject { false }.should be_kind_of(Hash)
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HashSpecs::MyHash[1 => 2, 3 => 4].reject { true }.should be_kind_of(Hash)
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end
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it "does not taint the resulting hash" do
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h = { a: 1 }.taint
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h.reject {false}.tainted?.should == false
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end
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end
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it "processes entries with the same order as reject!" do
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h = { a: 1, b: 2, c: 3, d: 4 }
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reject_pairs = []
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reject_bang_pairs = []
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h.dup.reject { |*pair| reject_pairs << pair }
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h.reject! { |*pair| reject_bang_pairs << pair }
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reject_pairs.should == reject_bang_pairs
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end
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it_behaves_like :hash_iteration_no_block, :reject
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it_behaves_like :enumeratorized_with_origin_size, :reject, { 1 => 2, 3 => 4, 5 => 6 }
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end
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describe "Hash#reject!" do
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it "removes keys from self for which the block yields true" do
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hsh = {}
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(1 .. 10).each { |k| hsh[k] = (k % 2 == 0) }
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hsh.reject! { |k,v| v }
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hsh.keys.sort.should == [1,3,5,7,9]
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end
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it "removes all entries if the block is true" do
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h = { a: 1, b: 2, c: 3 }
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h.reject! { |k,v| true }.should equal(h)
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h.should == {}
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end
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it "is equivalent to delete_if if changes are made" do
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hsh = { a: 1 }
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hsh.reject! { |k,v| v < 2 }.should == hsh.dup.delete_if { |k, v| v < 2 }
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end
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it "returns nil if no changes were made" do
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{ a: 1 }.reject! { |k,v| v > 1 }.should == nil
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end
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it "processes entries with the same order as delete_if" do
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h = { a: 1, b: 2, c: 3, d: 4 }
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reject_bang_pairs = []
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delete_if_pairs = []
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h.dup.reject! { |*pair| reject_bang_pairs << pair }
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h.dup.delete_if { |*pair| delete_if_pairs << pair }
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reject_bang_pairs.should == delete_if_pairs
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end
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it "raises a #{frozen_error_class} if called on a frozen instance that is modified" do
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lambda { HashSpecs.empty_frozen_hash.reject! { true } }.should raise_error(frozen_error_class)
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end
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it "raises a #{frozen_error_class} if called on a frozen instance that would not be modified" do
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lambda { HashSpecs.frozen_hash.reject! { false } }.should raise_error(frozen_error_class)
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end
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it_behaves_like :hash_iteration_no_block, :reject!
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it_behaves_like :enumeratorized_with_origin_size, :reject!, { 1 => 2, 3 => 4, 5 => 6 }
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end
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