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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerable#tally" do
before :each do
ScratchPad.record []
end
it "returns a hash with counts according to the value" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
enum.tally.should == { 'foo' => 2, 'bar' => 1, 'baz' => 1}
end
it "returns a hash without default" do
hash = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz').tally
hash.default_proc.should be_nil
hash.default.should be_nil
end
it "returns an empty hash for empty enumerables" do
EnumerableSpecs::Empty.new.tally.should == {}
end
it "counts values as gathered array when yielded with multiple arguments" do
EnumerableSpecs::YieldsMixed2.new.tally.should == EnumerableSpecs::YieldsMixed2.gathered_yields.group_by(&:itself).transform_values(&:size)
end
it "does not call given block" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
enum.tally { |v| ScratchPad << v }
ScratchPad.recorded.should == []
end
end
describe "Enumerable#tally with a hash" do
before :each do
ScratchPad.record []
end
it "returns a hash with counts according to the value" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
enum.tally({ 'foo' => 1 }).should == { 'foo' => 3, 'bar' => 1, 'baz' => 1}
end
it "returns the given hash" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
hash = { 'foo' => 1 }
enum.tally(hash).should equal(hash)
end
it "calls #to_hash to convert argument to Hash implicitly if passed not a Hash" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
object = Object.new
def object.to_hash; { 'foo' => 1 }; end
enum.tally(object).should == { 'foo' => 3, 'bar' => 1, 'baz' => 1}
end
it "raises a FrozenError and does not update the given hash when the hash is frozen" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
hash = { 'foo' => 1 }.freeze
-> { enum.tally(hash) }.should raise_error(FrozenError)
hash.should == { 'foo' => 1 }
end
it "raises a FrozenError even if enumerable is empty" do
enum = EnumerableSpecs::Numerous.new()
hash = { 'foo' => 1 }.freeze
-> { enum.tally(hash) }.should raise_error(FrozenError)
end
it "does not call given block" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
enum.tally({ 'foo' => 1 }) { |v| ScratchPad << v }
ScratchPad.recorded.should == []
end
it "ignores the default value" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
enum.tally(Hash.new(100)).should == { 'foo' => 2, 'bar' => 1, 'baz' => 1}
end
it "ignores the default proc" do
enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
enum.tally(Hash.new {100}).should == { 'foo' => 2, 'bar' => 1, 'baz' => 1}
end
it "needs the values counting each elements to be an integer" do
enum = EnumerableSpecs::Numerous.new('foo')
-> { enum.tally({ 'foo' => 'bar' }) }.should raise_error(TypeError)
end
end
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