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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Kernel#rand" do
it "is a private method" do
Kernel.should have_private_instance_method(:rand)
end
it "returns a float if no argument is passed" do
rand.should be_kind_of(Float)
end
it "returns an integer for an integer argument" do
rand(77).should be_kind_of(Integer)
end
it "returns an integer for a float argument greater than 1" do
rand(1.3).should be_kind_of(Integer)
end
it "returns a float for an argument between -1 and 1" do
rand(-0.999).should be_kind_of(Float)
rand(-0.01).should be_kind_of(Float)
rand(0).should be_kind_of(Float)
rand(0.01).should be_kind_of(Float)
rand(0.999).should be_kind_of(Float)
end
it "ignores the sign of the argument" do
[0, 1, 2, 3].should include(rand(-4))
end
it "never returns a value greater or equal to 1.0 with no arguments" do
1000.times do
(0...1.0).should include(rand)
end
end
it "never returns a value greater or equal to any passed in max argument" do
1000.times do
(0...100).to_a.should include(rand(100))
end
end
it "calls to_int on its argument" do
l = mock('limit')
l.should_receive(:to_int).and_return 7
rand l
end
context "given an exclusive range" do
it "returns an Integer between the two Integers" do
1000.times do
x = rand(4...6)
x.should be_kind_of(Integer)
(4...6).should include(x)
end
end
it "returns a Float between the given Integer and Float" do
1000.times do
x = rand(4...6.5)
x.should be_kind_of(Float)
(4...6.5).should include(x)
end
end
it "returns a Float between the given Float and Integer" do
1000.times do
x = rand(3.5...6)
x.should be_kind_of(Float)
(3.5...6).should include(x)
end
end
it "returns a Float between the two given Floats" do
1000.times do
x = rand(3.5...6.5)
x.should be_kind_of(Float)
(3.5...6.5).should include(x)
end
end
end
context "given an inclusive range" do
it "returns an Integer between the two Integers" do
1000.times do
x = rand(4..6)
x.should be_kind_of(Integer)
(4..6).should include(x)
end
end
it "returns a Float between the given Integer and Float" do
1000.times do
x = rand(4..6.5)
x.should be_kind_of(Float)
(4..6.5).should include(x)
end
end
it "returns a Float between the given Float and Integer" do
1000.times do
x = rand(3.5..6)
x.should be_kind_of(Float)
(3.5..6).should include(x)
end
end
it "returns a Float between the two given Floats" do
1000.times do
x = rand(3.5..6.5)
x.should be_kind_of(Float)
(3.5..6.5).should include(x)
end
end
end
context "given an inclusive range between 0 and 1" do
it "returns an Integer between the two Integers" do
x = rand(0..1)
x.should be_kind_of(Integer)
(0..1).should include(x)
end
it "returns a Float if at least one side is Float" do
seed = 42
x1 = Random.new(seed).rand(0..1.0)
x2 = Random.new(seed).rand(0.0..1.0)
x3 = Random.new(seed).rand(0.0..1)
x3.should be_kind_of(Float)
x1.should eql(x3)
x2.should eql(x3)
(0.0..1.0).should include(x3)
end
end
context "given an exclusive range between 0 and 1" do
it "returns zero as an Integer" do
x = rand(0...1)
x.should be_kind_of(Integer)
x.should eql(0)
end
it "returns a Float if at least one side is Float" do
seed = 42
x1 = Random.new(seed).rand(0...1.0)
x2 = Random.new(seed).rand(0.0...1.0)
x3 = Random.new(seed).rand(0.0...1)
x3.should be_kind_of(Float)
x1.should eql(x3)
x2.should eql(x3)
(0.0...1.0).should include(x3)
end
end
it "returns a numeric for an range argument where max is < 1" do
rand(0.25..0.75).should be_kind_of(Numeric)
end
it "returns nil when range is backwards" do
rand(1..0).should be_nil
end
it "returns the range start/end when Float range is 0" do
rand(1.0..1.0).should eql(1.0)
end
it "returns the range start/end when Integer range is 0" do
rand(42..42).should eql(42)
end
it "supports custom object types" do
rand(KernelSpecs::CustomRangeInteger.new(1)..KernelSpecs::CustomRangeInteger.new(42)).should be_an_instance_of(KernelSpecs::CustomRangeInteger)
rand(KernelSpecs::CustomRangeFloat.new(1.0)..KernelSpecs::CustomRangeFloat.new(42.0)).should be_an_instance_of(KernelSpecs::CustomRangeFloat)
rand(Time.now..Time.now).should be_an_instance_of(Time)
end
it "is random on boot" do
results = 2.times.map {
out = ruby_exe('p rand', options: '--disable-gems')
Float(out)
}
results.size.should == 2
# this is technically flaky, but very unlikely in a good distribution
results[0].should_not == results[1]
end
end
describe "Kernel.rand" do
it "needs to be reviewed for spec completeness"
end
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