diff options
author | eregon <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-09-20 20:18:52 +0000 |
---|---|---|
committer | eregon <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2017-09-20 20:18:52 +0000 |
commit | 1d15d5f08032acf1b7bceacbb450d617ff6e0931 (patch) | |
tree | a3785a79899302bc149e4a6e72f624ac27dc1f10 /spec/ruby/core/array/sample_spec.rb | |
parent | 75bfc6440d595bf339007f4fb280fd4d743e89c1 (diff) | |
download | ruby-1d15d5f08032acf1b7bceacbb450d617ff6e0931.tar.gz |
Move spec/rubyspec to spec/ruby for consistency
* Other ruby implementations use the spec/ruby directory.
[Misc #13792] [ruby-core:82287]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'spec/ruby/core/array/sample_spec.rb')
-rw-r--r-- | spec/ruby/core/array/sample_spec.rb | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/spec/ruby/core/array/sample_spec.rb b/spec/ruby/core/array/sample_spec.rb new file mode 100644 index 0000000000..53601dd5c4 --- /dev/null +++ b/spec/ruby/core/array/sample_spec.rb @@ -0,0 +1,155 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Array#sample" do + it "samples evenly" do + ary = [0, 1, 2, 3] + 3.times do |i| + counts = [0, 0, 0, 0] + 4000.times do + counts[ary.sample(3)[i]] += 1 + end + counts.each do |count| + (800..1200).should include(count) + end + end + end + + it "returns nil for an empty Array" do + [].sample.should be_nil + end + + it "returns a single value when not passed a count" do + [4].sample.should equal(4) + end + + it "returns an empty Array when passed zero" do + [4].sample(0).should == [] + end + + it "returns an Array of elements when passed a count" do + [1, 2, 3, 4].sample(3).should be_an_instance_of(Array) + end + + it "returns elements from the Array" do + array = [1, 2, 3, 4] + array.sample(3).all? { |x| array.should include(x) } + end + + it "returns at most the number of elements in the Array" do + array = [1, 2, 3, 4] + result = array.sample(20) + result.size.should == 4 + end + + it "does not return the same value if the Array has unique values" do + array = [1, 2, 3, 4] + result = array.sample(20) + result.sort.should == array + end + + it "may return the same value if the array is not unique" do + [4, 4].sample(2).should == [4,4] + end + + it "calls #to_int to convert the count when passed an Object" do + [1, 2, 3, 4].sample(mock_int(2)).size.should == 2 + end + + it "raises ArgumentError when passed a negative count" do + lambda { [1, 2].sample(-1) }.should raise_error(ArgumentError) + end + + it "does not return subclass instances with Array subclass" do + ArraySpecs::MyArray[1, 2, 3].sample(2).should be_an_instance_of(Array) + end + + describe "with options" do + it "calls #to_hash to convert the passed Object" do + obj = mock("array_sample") + obj.should_receive(:to_hash).and_return({}) + obj.should_not_receive(:to_int) + + [1, 2].sample(obj).should be_an_instance_of(Fixnum) + end + + it "calls #to_int on the first argument and #to_hash on the second when passed Objects" do + count = mock("array_sample_count") + count.should_receive(:to_int).and_return(2) + options = mock("array_sample_options") + options.should_receive(:to_hash).and_return({}) + + [1, 2].sample(count, options).size.should == 2 + end + + it "calls #rand on the Object passed by the :random key in the arguments Hash" do + obj = mock("array_sample_random") + obj.should_receive(:rand).and_return(0.5) + + [1, 2].sample(random: obj).should be_an_instance_of(Fixnum) + end + + it "raises a NoMethodError if an object passed for the RNG does not define #rand" do + obj = BasicObject.new + + lambda { [1, 2].sample(random: obj) }.should raise_error(NoMethodError) + end + + describe "when the object returned by #rand is a Fixnum" do + it "uses the fixnum as index" do + random = mock("array_sample_random_ret") + random.should_receive(:rand).and_return(0) + + [1, 2].sample(random: random).should == 1 + + random = mock("array_sample_random_ret") + random.should_receive(:rand).and_return(1) + + [1, 2].sample(random: random).should == 2 + end + + it "raises a RangeError if the value is less than zero" do + random = mock("array_sample_random") + random.should_receive(:rand).and_return(-1) + + lambda { [1, 2].sample(random: random) }.should raise_error(RangeError) + end + + it "raises a RangeError if the value is equal to the Array size" do + random = mock("array_sample_random") + random.should_receive(:rand).and_return(2) + + lambda { [1, 2].sample(random: random) }.should raise_error(RangeError) + end + end + end + + describe "when the object returned by #rand is not a Fixnum but responds to #to_int" do + it "calls #to_int on the Object" do + value = mock("array_sample_random_value") + value.should_receive(:to_int).and_return(1) + random = mock("array_sample_random") + random.should_receive(:rand).and_return(value) + + [1, 2].sample(random: random).should == 2 + end + + it "raises a RangeError if the value is less than zero" do + value = mock("array_sample_random_value") + value.should_receive(:to_int).and_return(-1) + random = mock("array_sample_random") + random.should_receive(:rand).and_return(value) + + lambda { [1, 2].sample(random: random) }.should raise_error(RangeError) + end + + it "raises a RangeError if the value is equal to the Array size" do + value = mock("array_sample_random_value") + value.should_receive(:to_int).and_return(2) + random = mock("array_sample_random") + random.should_receive(:rand).and_return(value) + + lambda { [1, 2].sample(random: random) }.should raise_error(RangeError) + end + end +end |