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require_relative '../../spec_helper'
require_relative '../../fixtures/rational'
describe :kernel_Rational, shared: true do
describe "passed Integer" do
# Guard against the Mathn library
guard -> { !defined?(Math.rsqrt) } do
it "returns a new Rational number with 1 as the denominator" do
Rational(1).should eql(Rational(1, 1))
Rational(-3).should eql(Rational(-3, 1))
Rational(bignum_value).should eql(Rational(bignum_value, 1))
end
end
end
describe "passed two integers" do
it "returns a new Rational number" do
rat = Rational(1, 2)
rat.numerator.should == 1
rat.denominator.should == 2
rat.should be_an_instance_of(Rational)
rat = Rational(-3, -5)
rat.numerator.should == 3
rat.denominator.should == 5
rat.should be_an_instance_of(Rational)
rat = Rational(bignum_value, 3)
rat.numerator.should == bignum_value
rat.denominator.should == 3
rat.should be_an_instance_of(Rational)
end
it "reduces the Rational" do
rat = Rational(2, 4)
rat.numerator.should == 1
rat.denominator.should == 2
rat = Rational(3, 9)
rat.numerator.should == 1
rat.denominator.should == 3
end
end
describe "when passed a String" do
it "converts the String to a Rational using the same method as String#to_r" do
r = Rational(13, 25)
s_r = ".52".to_r
r_s = Rational(".52")
r_s.should == r
r_s.should == s_r
end
it "scales the Rational value of the first argument by the Rational value of the second" do
Rational(".52", ".6").should == Rational(13, 15)
Rational(".52", "1.6").should == Rational(13, 40)
end
it "does not use the same method as Float#to_r" do
r = Rational(3, 5)
f_r = 0.6.to_r
r_s = Rational("0.6")
r_s.should == r
r_s.should_not == f_r
end
end
describe "when passed a Numeric" do
it "calls #to_r to convert the first argument to a Rational" do
num = RationalSpecs::SubNumeric.new(2)
Rational(num).should == Rational(2)
end
end
describe "when passed a Complex" do
it "returns a Rational from the real part if the imaginary part is 0" do
Rational(Complex(1, 0)).should == Rational(1)
end
it "raises a RangeError if the imaginary part is not 0" do
-> { Rational(Complex(1, 2)) }.should raise_error(RangeError)
end
end
it "raises a ZeroDivisionError if the second argument is 0" do
-> { Rational(1, 0) }.should raise_error(ZeroDivisionError, "divided by 0")
-> { Rational(1, 0.0) }.should raise_error(ZeroDivisionError, "divided by 0")
end
it "raises a TypeError if the first argument is nil" do
-> { Rational(nil) }.should raise_error(TypeError)
end
it "raises a TypeError if the second argument is nil" do
-> { Rational(1, nil) }.should raise_error(TypeError)
end
it "raises a TypeError if the first argument is a Symbol" do
-> { Rational(:sym) }.should raise_error(TypeError)
end
it "raises a TypeError if the second argument is a Symbol" do
-> { Rational(1, :sym) }.should raise_error(TypeError)
end
describe "when passed exception: false" do
describe "and [non-Numeric]" do
it "swallows an error" do
Rational(:sym, exception: false).should == nil
Rational("abc", exception: false).should == nil
end
end
describe "and [non-Numeric, Numeric]" do
it "swallows an error" do
Rational(:sym, 1, exception: false).should == nil
Rational("abc", 1, exception: false).should == nil
end
end
describe "and [anything, non-Numeric]" do
it "swallows an error" do
Rational(:sym, :sym, exception: false).should == nil
Rational("abc", :sym, exception: false).should == nil
end
end
describe "and non-Numeric String arguments" do
it "swallows an error" do
Rational("a", "b", exception: false).should == nil
Rational("a", 0, exception: false).should == nil
Rational(0, "b", exception: false).should == nil
end
end
describe "and nil arguments" do
it "swallows an error" do
Rational(nil, exception: false).should == nil
Rational(nil, nil, exception: false).should == nil
end
end
end
end
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