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Diffstat (limited to 'spec/ruby/core/hash/reject_spec.rb')
-rw-r--r-- | spec/ruby/core/hash/reject_spec.rb | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/reject_spec.rb b/spec/ruby/core/hash/reject_spec.rb new file mode 100644 index 0000000000..21dd7425aa --- /dev/null +++ b/spec/ruby/core/hash/reject_spec.rb @@ -0,0 +1,100 @@ +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#reject" do + it "returns a new hash removing keys for which the block yields true" do + h = { 1=>false, 2=>true, 3=>false, 4=>true } + h.reject { |k,v| v }.keys.sort.should == [1,3] + end + + it "is equivalent to hsh.dup.delete_if" do + h = { a: 'a', b: 'b', c: 'd' } + h.reject { |k,v| k == 'd' }.should == (h.dup.delete_if { |k, v| k == 'd' }) + + all_args_reject = [] + all_args_delete_if = [] + h = { 1 => 2, 3 => 4 } + h.reject { |*args| all_args_reject << args } + h.delete_if { |*args| all_args_delete_if << args } + all_args_reject.should == all_args_delete_if + + h = { 1 => 2 } + # dup doesn't copy singleton methods + def h.to_a() end + h.reject { false }.to_a.should == [[1, 2]] + end + + context "with extra state" do + it "returns Hash instance for subclasses" do + HashSpecs::MyHash[1 => 2, 3 => 4].reject { false }.should be_kind_of(Hash) + HashSpecs::MyHash[1 => 2, 3 => 4].reject { true }.should be_kind_of(Hash) + end + + it "does not taint the resulting hash" do + h = { a: 1 }.taint + h.reject {false}.tainted?.should == false + end + end + + it "processes entries with the same order as reject!" do + h = { a: 1, b: 2, c: 3, d: 4 } + + reject_pairs = [] + reject_bang_pairs = [] + h.dup.reject { |*pair| reject_pairs << pair } + h.reject! { |*pair| reject_bang_pairs << pair } + + reject_pairs.should == reject_bang_pairs + end + + it_behaves_like(:hash_iteration_no_block, :reject) + it_behaves_like(:enumeratorized_with_origin_size, :reject, { 1 => 2, 3 => 4, 5 => 6 }) +end + +describe "Hash#reject!" do + it "removes keys from self for which the block yields true" do + hsh = {} + (1 .. 10).each { |k| hsh[k] = (k % 2 == 0) } + hsh.reject! { |k,v| v } + hsh.keys.sort.should == [1,3,5,7,9] + end + + it "removes all entries if the block is true" do + h = { a: 1, b: 2, c: 3 } + h.reject! { |k,v| true }.should equal(h) + h.should == {} + end + + it "is equivalent to delete_if if changes are made" do + hsh = { a: 1 } + hsh.reject! { |k,v| v < 2 }.should == hsh.dup.delete_if { |k, v| v < 2 } + end + + it "returns nil if no changes were made" do + { a: 1 }.reject! { |k,v| v > 1 }.should == nil + end + + it "processes entries with the same order as delete_if" do + h = { a: 1, b: 2, c: 3, d: 4 } + + reject_bang_pairs = [] + delete_if_pairs = [] + h.dup.reject! { |*pair| reject_bang_pairs << pair } + h.dup.delete_if { |*pair| delete_if_pairs << pair } + + reject_bang_pairs.should == delete_if_pairs + end + + it "raises a RuntimeError if called on a frozen instance that is modified" do + lambda { HashSpecs.empty_frozen_hash.reject! { true } }.should raise_error(RuntimeError) + end + + it "raises a RuntimeError if called on a frozen instance that would not be modified" do + lambda { HashSpecs.frozen_hash.reject! { false } }.should raise_error(RuntimeError) + end + + it_behaves_like(:hash_iteration_no_block, :reject!) + it_behaves_like(:enumeratorized_with_origin_size, :reject!, { 1 => 2, 3 => 4, 5 => 6 }) +end |