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Diffstat (limited to 'spec/ruby/core/hash/select_spec.rb')
-rw-r--r-- | spec/ruby/core/hash/select_spec.rb | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/spec/ruby/core/hash/select_spec.rb b/spec/ruby/core/hash/select_spec.rb new file mode 100644 index 0000000000..449607b606 --- /dev/null +++ b/spec/ruby/core/hash/select_spec.rb @@ -0,0 +1,83 @@ +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#select" do + before :each do + @hsh = { 1 => 2, 3 => 4, 5 => 6 } + @empty = {} + end + + it "yields two arguments: key and value" do + all_args = [] + { 1 => 2, 3 => 4 }.select { |*args| all_args << args } + all_args.sort.should == [[1, 2], [3, 4]] + end + + it "returns a Hash of entries for which block is true" do + a_pairs = { 'a' => 9, 'c' => 4, 'b' => 5, 'd' => 2 }.select { |k,v| v % 2 == 0 } + a_pairs.should be_an_instance_of(Hash) + a_pairs.sort.should == [['c', 4], ['d', 2]] + end + + it "processes entries with the same order as reject" do + h = { a: 9, c: 4, b: 5, d: 2 } + + select_pairs = [] + reject_pairs = [] + h.dup.select { |*pair| select_pairs << pair } + h.reject { |*pair| reject_pairs << pair } + + select_pairs.should == reject_pairs + end + + it "returns an Enumerator when called on a non-empty hash without a block" do + @hsh.select.should be_an_instance_of(Enumerator) + end + + it "returns an Enumerator when called on an empty hash without a block" do + @empty.select.should be_an_instance_of(Enumerator) + end + + it_behaves_like(:hash_iteration_no_block, :select) + it_behaves_like(:enumeratorized_with_origin_size, :select, { 1 => 2, 3 => 4, 5 => 6 }) +end + +describe "Hash#select!" do + before :each do + @hsh = { 1 => 2, 3 => 4, 5 => 6 } + @empty = {} + end + + it "is equivalent to keep_if if changes are made" do + h = { a: 2 } + h.select! { |k,v| v <= 1 }.should equal h + + h = { 1 => 2, 3 => 4 } + all_args_select = [] + h.dup.select! { |*args| all_args_select << args } + all_args_select.should == [[1, 2], [3, 4]] + end + + it "removes all entries if the block is false" do + h = { a: 1, b: 2, c: 3 } + h.select! { |k,v| false }.should equal(h) + h.should == {} + end + + it "returns nil if no changes were made" do + { a: 1 }.select! { |k,v| v <= 1 }.should == nil + end + + it "raises a RuntimeError if called on an empty frozen instance" do + lambda { HashSpecs.empty_frozen_hash.select! { false } }.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.select! { true } }.should raise_error(RuntimeError) + end + + it_behaves_like(:hash_iteration_no_block, :select!) + it_behaves_like(:enumeratorized_with_origin_size, :select!, { 1 => 2, 3 => 4, 5 => 6 }) +end |