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-rw-r--r--spec/rubyspec/core/array/sample_spec.rb155
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diff --git a/spec/rubyspec/core/array/sample_spec.rb b/spec/rubyspec/core/array/sample_spec.rb
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--- a/spec/rubyspec/core/array/sample_spec.rb
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-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