diff options
Diffstat (limited to 'spec/ruby/core/rational')
35 files changed, 1297 insertions, 0 deletions
diff --git a/spec/ruby/core/rational/abs_spec.rb b/spec/ruby/core/rational/abs_spec.rb new file mode 100644 index 0000000000..54099aa14d --- /dev/null +++ b/spec/ruby/core/rational/abs_spec.rb @@ -0,0 +1,6 @@ +require_relative "../../spec_helper" +require_relative 'shared/abs' + +describe "Rational#abs" do + it_behaves_like :rational_abs, :abs +end diff --git a/spec/ruby/core/rational/ceil_spec.rb b/spec/ruby/core/rational/ceil_spec.rb new file mode 100644 index 0000000000..d5bdadf3b6 --- /dev/null +++ b/spec/ruby/core/rational/ceil_spec.rb @@ -0,0 +1,45 @@ +require_relative "../../spec_helper" + +describe "Rational#ceil" do + before do + @rational = Rational(2200, 7) + end + + describe "with no arguments (precision = 0)" do + it "returns an Integer" do + @rational.ceil.should be_kind_of(Integer) + end + + it "returns the truncated value toward positive infinity" do + @rational.ceil.should == 315 + Rational(1, 2).ceil.should == 1 + Rational(-1, 2).ceil.should == 0 + end + end + + describe "with a precision < 0" do + it "returns an Integer" do + @rational.ceil(-2).should be_kind_of(Integer) + @rational.ceil(-1).should be_kind_of(Integer) + end + + it "moves the truncation point n decimal places left" do + @rational.ceil(-3).should == 1000 + @rational.ceil(-2).should == 400 + @rational.ceil(-1).should == 320 + end + end + + describe "with precision > 0" do + it "returns a Rational" do + @rational.ceil(1).should be_kind_of(Rational) + @rational.ceil(2).should be_kind_of(Rational) + end + + it "moves the truncation point n decimal places right" do + @rational.ceil(1).should == Rational(3143, 10) + @rational.ceil(2).should == Rational(31429, 100) + @rational.ceil(3).should == Rational(157143, 500) + end + end +end diff --git a/spec/ruby/core/rational/comparison_spec.rb b/spec/ruby/core/rational/comparison_spec.rb new file mode 100644 index 0000000000..c9db60d5c7 --- /dev/null +++ b/spec/ruby/core/rational/comparison_spec.rb @@ -0,0 +1,93 @@ +require_relative "../../spec_helper" +require_relative 'fixtures/rational' + +describe "Rational#<=> when passed a Rational object" do + it "returns 1 when self is greater than the passed argument" do + (Rational(4, 4) <=> Rational(3, 4)).should equal(1) + (Rational(-3, 4) <=> Rational(-4, 4)).should equal(1) + end + + it "returns 0 when self is equal to the passed argument" do + (Rational(4, 4) <=> Rational(4, 4)).should equal(0) + (Rational(-3, 4) <=> Rational(-3, 4)).should equal(0) + end + + it "returns -1 when self is less than the passed argument" do + (Rational(3, 4) <=> Rational(4, 4)).should equal(-1) + (Rational(-4, 4) <=> Rational(-3, 4)).should equal(-1) + end +end + +describe "Rational#<=> when passed an Integer object" do + it "returns 1 when self is greater than the passed argument" do + (Rational(4, 4) <=> 0).should equal(1) + (Rational(4, 4) <=> -10).should equal(1) + (Rational(-3, 4) <=> -1).should equal(1) + end + + it "returns 0 when self is equal to the passed argument" do + (Rational(4, 4) <=> 1).should equal(0) + (Rational(-8, 4) <=> -2).should equal(0) + end + + it "returns -1 when self is less than the passed argument" do + (Rational(3, 4) <=> 1).should equal(-1) + (Rational(-4, 4) <=> 0).should equal(-1) + end +end + +describe "Rational#<=> when passed a Float object" do + it "returns 1 when self is greater than the passed argument" do + (Rational(4, 4) <=> 0.5).should equal(1) + (Rational(4, 4) <=> -1.5).should equal(1) + (Rational(-3, 4) <=> -0.8).should equal(1) + end + + it "returns 0 when self is equal to the passed argument" do + (Rational(4, 4) <=> 1.0).should equal(0) + (Rational(-6, 4) <=> -1.5).should equal(0) + end + + it "returns -1 when self is less than the passed argument" do + (Rational(3, 4) <=> 1.2).should equal(-1) + (Rational(-4, 4) <=> 0.5).should equal(-1) + end +end + +describe "Rational#<=> when passed an Object that responds to #coerce" do + it "calls #coerce on the passed argument with self" do + rational = Rational(3, 4) + + obj = mock("Object") + obj.should_receive(:coerce).with(rational).and_return([1, 2]) + + rational <=> obj + end + + it "calls #<=> on the coerced Rational with the coerced Object" do + rational = Rational(3, 4) + + coerced_rational = mock("Coerced Rational") + coerced_rational.should_receive(:<=>).and_return(:result) + + coerced_obj = mock("Coerced Object") + + obj = mock("Object") + obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj]) + + (rational <=> obj).should == :result + end + + it "does not rescue exception raised in other#coerce" do + b = mock("numeric with failed #coerce") + b.should_receive(:coerce).and_raise(RationalSpecs::CoerceError) + + -> { Rational(3, 4) <=> b }.should raise_error(RationalSpecs::CoerceError) + end +end + +describe "Rational#<=> when passed a non-Numeric Object that doesn't respond to #coerce" do + it "returns nil" do + (Rational <=> mock("Object")).should be_nil + end +end diff --git a/spec/ruby/core/rational/denominator_spec.rb b/spec/ruby/core/rational/denominator_spec.rb new file mode 100644 index 0000000000..4687244893 --- /dev/null +++ b/spec/ruby/core/rational/denominator_spec.rb @@ -0,0 +1,14 @@ +require_relative "../../spec_helper" + +describe "Rational#denominator" do + it "returns the denominator" do + Rational(3, 4).denominator.should equal(4) + Rational(3, -4).denominator.should equal(4) + + Rational(1, bignum_value).denominator.should == bignum_value + end + + it "returns 1 if no denominator was given" do + Rational(80).denominator.should == 1 + end +end diff --git a/spec/ruby/core/rational/div_spec.rb b/spec/ruby/core/rational/div_spec.rb new file mode 100644 index 0000000000..d3adb9b536 --- /dev/null +++ b/spec/ruby/core/rational/div_spec.rb @@ -0,0 +1,54 @@ +require_relative "../../spec_helper" + +describe "Rational#div" do + it "returns an Integer" do + Rational(229, 21).div(82).should be_kind_of(Integer) + end + + it "raises an ArgumentError if passed more than one argument" do + -> { Rational(3, 4).div(2,3) }.should raise_error(ArgumentError) + end + + # See http://redmine.ruby-lang.org/issues/show/1648 + it "raises a TypeError if passed a non-numeric argument" do + -> { Rational(3, 4).div([]) }.should raise_error(TypeError) + end +end + +describe "Rational#div passed a Rational" do + it "performs integer division and returns the result" do + Rational(2, 3).div(Rational(2, 3)).should == 1 + Rational(-2, 9).div(Rational(-9, 2)).should == 0 + end + + it "raises a ZeroDivisionError when the argument has a numerator of 0" do + -> { Rational(3, 4).div(Rational(0, 3)) }.should raise_error(ZeroDivisionError) + end + + it "raises a ZeroDivisionError when the argument has a numerator of 0.0" do + -> { Rational(3, 4).div(Rational(0.0, 3)) }.should raise_error(ZeroDivisionError) + end +end + +describe "Rational#div passed an Integer" do + it "performs integer division and returns the result" do + Rational(2, 1).div(1).should == 2 + Rational(25, 5).div(-50).should == -1 + end + + it "raises a ZeroDivisionError when the argument is 0" do + -> { Rational(3, 4).div(0) }.should raise_error(ZeroDivisionError) + end +end + +describe "Rational#div passed a Float" do + it "performs integer division and returns the result" do + Rational(2, 3).div(30.333).should == 0 + Rational(2, 9).div(Rational(-8.6)).should == -1 + Rational(3.12).div(0.5).should == 6 + end + + it "raises a ZeroDivisionError when the argument is 0.0" do + -> { Rational(3, 4).div(0.0) }.should raise_error(ZeroDivisionError) + end +end diff --git a/spec/ruby/core/rational/divide_spec.rb b/spec/ruby/core/rational/divide_spec.rb new file mode 100644 index 0000000000..8f5ca1fdec --- /dev/null +++ b/spec/ruby/core/rational/divide_spec.rb @@ -0,0 +1,74 @@ +require_relative "../../spec_helper" +require_relative 'shared/arithmetic_exception_in_coerce' + +describe "Rational#/" do + it "calls #coerce on the passed argument with self" do + rational = Rational(3, 4) + obj = mock("Object") + obj.should_receive(:coerce).with(rational).and_return([1, 2]) + + rational / obj + end + + it "calls #/ on the coerced Rational with the coerced Object" do + rational = Rational(3, 4) + + coerced_rational = mock("Coerced Rational") + coerced_rational.should_receive(:/).and_return(:result) + + coerced_obj = mock("Coerced Object") + + obj = mock("Object") + obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj]) + + (rational / obj).should == :result + end + + it_behaves_like :rational_arithmetic_exception_in_coerce, :/ +end + +describe "Rational#/ when passed an Integer" do + it "returns self divided by other as a Rational" do + (Rational(3, 4) / 2).should eql(Rational(3, 8)) + (Rational(2, 4) / 2).should eql(Rational(1, 4)) + (Rational(6, 7) / -2).should eql(Rational(-3, 7)) + end + + it "raises a ZeroDivisionError when passed 0" do + -> { Rational(3, 4) / 0 }.should raise_error(ZeroDivisionError) + end +end + +describe "Rational#/ when passed a Rational" do + it "returns self divided by other as a Rational" do + (Rational(3, 4) / Rational(3, 4)).should eql(Rational(1, 1)) + (Rational(2, 4) / Rational(1, 4)).should eql(Rational(2, 1)) + + (Rational(2, 4) / 2).should == Rational(1, 4) + (Rational(6, 7) / -2).should == Rational(-3, 7) + end + + it "raises a ZeroDivisionError when passed a Rational with a numerator of 0" do + -> { Rational(3, 4) / Rational(0, 1) }.should raise_error(ZeroDivisionError) + end +end + +describe "Rational#/ when passed a Float" do + it "returns self divided by other as a Float" do + (Rational(3, 4) / 0.75).should eql(1.0) + (Rational(3, 4) / 0.25).should eql(3.0) + (Rational(3, 4) / 0.3).should eql(2.5) + + (Rational(-3, 4) / 0.3).should eql(-2.5) + (Rational(3, -4) / 0.3).should eql(-2.5) + (Rational(3, 4) / -0.3).should eql(-2.5) + end + + it "returns infinity when passed 0" do + (Rational(3, 4) / 0.0).infinite?.should eql(1) + (Rational(-3, -4) / 0.0).infinite?.should eql(1) + + (Rational(-3, 4) / 0.0).infinite?.should eql(-1) + (Rational(3, -4) / 0.0).infinite?.should eql(-1) + end +end diff --git a/spec/ruby/core/rational/divmod_spec.rb b/spec/ruby/core/rational/divmod_spec.rb new file mode 100644 index 0000000000..f0555294a3 --- /dev/null +++ b/spec/ruby/core/rational/divmod_spec.rb @@ -0,0 +1,42 @@ +require_relative "../../spec_helper" + +describe "Rational#divmod when passed a Rational" do + it "returns the quotient as Integer and the remainder as Rational" do + Rational(7, 4).divmod(Rational(1, 2)).should eql([3, Rational(1, 4)]) + Rational(7, 4).divmod(Rational(-1, 2)).should eql([-4, Rational(-1, 4)]) + Rational(0, 4).divmod(Rational(4, 3)).should eql([0, Rational(0, 1)]) + + Rational(bignum_value, 4).divmod(Rational(4, 3)).should eql([3458764513820540928, Rational(0, 1)]) + end + + it "raises a ZeroDivisionError when passed a Rational with a numerator of 0" do + -> { Rational(7, 4).divmod(Rational(0, 3)) }.should raise_error(ZeroDivisionError) + end +end + +describe "Rational#divmod when passed an Integer" do + it "returns the quotient as Integer and the remainder as Rational" do + Rational(7, 4).divmod(2).should eql([0, Rational(7, 4)]) + Rational(7, 4).divmod(-2).should eql([-1, Rational(-1, 4)]) + + Rational(bignum_value, 4).divmod(3).should eql([1537228672809129301, Rational(1, 1)]) + end + + it "raises a ZeroDivisionError when passed 0" do + -> { Rational(7, 4).divmod(0) }.should raise_error(ZeroDivisionError) + end +end + +describe "Rational#divmod when passed a Float" do + it "returns the quotient as Integer and the remainder as Float" do + Rational(7, 4).divmod(0.5).should eql([3, 0.25]) + end + + it "returns the quotient as Integer and the remainder as Float" do + Rational(7, 4).divmod(-0.5).should eql([-4, -0.25]) + end + + it "raises a ZeroDivisionError when passed 0" do + -> { Rational(7, 4).divmod(0.0) }.should raise_error(ZeroDivisionError) + end +end diff --git a/spec/ruby/core/rational/equal_value_spec.rb b/spec/ruby/core/rational/equal_value_spec.rb new file mode 100644 index 0000000000..ba40d29c3b --- /dev/null +++ b/spec/ruby/core/rational/equal_value_spec.rb @@ -0,0 +1,39 @@ +require_relative "../../spec_helper" + +describe "Rational#==" do + it "returns the result of calling #== with self on the passed argument" do + obj = mock("Object") + obj.should_receive(:==).and_return(:result) + + (Rational(3, 4) == obj).should_not be_false + end +end + +describe "Rational#== when passed a Rational" do + it "returns true if self has the same numerator and denominator as the passed argument" do + (Rational(3, 4) == Rational(3, 4)).should be_true + (Rational(-3, -4) == Rational(3, 4)).should be_true + (Rational(-4, 5) == Rational(4, -5)).should be_true + + (Rational(bignum_value, 3) == Rational(bignum_value, 3)).should be_true + (Rational(-bignum_value, 3) == Rational(bignum_value, -3)).should be_true + end +end + +describe "Rational#== when passed a Float" do + it "converts self to a Float and compares it with the passed argument" do + (Rational(3, 4) == 0.75).should be_true + (Rational(4, 2) == 2.0).should be_true + (Rational(-4, 2) == -2.0).should be_true + (Rational(4, -2) == -2.0).should be_true + end +end + +describe "Rational#== when passed an Integer" do + it "returns true if self has the passed argument as numerator and a denominator of 1" do + # Rational(x, y) reduces x and y automatically + (Rational(4, 2) == 2).should be_true + (Rational(-4, 2) == -2).should be_true + (Rational(4, -2) == -2).should be_true + end +end diff --git a/spec/ruby/core/rational/exponent_spec.rb b/spec/ruby/core/rational/exponent_spec.rb new file mode 100644 index 0000000000..65fbf2ed1c --- /dev/null +++ b/spec/ruby/core/rational/exponent_spec.rb @@ -0,0 +1,236 @@ +require_relative "../../spec_helper" + +describe "Rational#**" do + describe "when passed Rational" do + # Guard against the Mathn library + guard -> { !defined?(Math.rsqrt) } do + it "returns Rational(1) if the exponent is Rational(0)" do + (Rational(0) ** Rational(0)).should eql(Rational(1)) + (Rational(1) ** Rational(0)).should eql(Rational(1)) + (Rational(3, 4) ** Rational(0)).should eql(Rational(1)) + (Rational(-1) ** Rational(0)).should eql(Rational(1)) + (Rational(-3, 4) ** Rational(0)).should eql(Rational(1)) + (Rational(bignum_value) ** Rational(0)).should eql(Rational(1)) + (Rational(-bignum_value) ** Rational(0)).should eql(Rational(1)) + end + + it "returns self raised to the argument as a Rational if the exponent's denominator is 1" do + (Rational(3, 4) ** Rational(1, 1)).should eql(Rational(3, 4)) + (Rational(3, 4) ** Rational(2, 1)).should eql(Rational(9, 16)) + (Rational(3, 4) ** Rational(-1, 1)).should eql(Rational(4, 3)) + (Rational(3, 4) ** Rational(-2, 1)).should eql(Rational(16, 9)) + end + + it "returns self raised to the argument as a Float if the exponent's denominator is not 1" do + (Rational(3, 4) ** Rational(4, 3)).should be_close(0.681420222312052, TOLERANCE) + (Rational(3, 4) ** Rational(-4, 3)).should be_close(1.46752322173095, TOLERANCE) + (Rational(3, 4) ** Rational(4, -3)).should be_close(1.46752322173095, TOLERANCE) + end + + it "returns a complex number when self is negative and the passed argument is not 0" do + (Rational(-3, 4) ** Rational(-4, 3)).should be_close(Complex(-0.7337616108654732, 1.2709123906625817), TOLERANCE) + end + end + end + + describe "when passed Integer" do + it "returns the Rational value of self raised to the passed argument" do + (Rational(3, 4) ** 4).should == Rational(81, 256) + (Rational(3, 4) ** -4).should == Rational(256, 81) + (Rational(-3, 4) ** -4).should == Rational(256, 81) + (Rational(3, -4) ** -4).should == Rational(256, 81) + + (Rational(bignum_value, 4) ** 4).should == Rational(452312848583266388373324160190187140051835877600158453279131187530910662656, 1) + (Rational(3, bignum_value) ** -4).should == Rational(115792089237316195423570985008687907853269984665640564039457584007913129639936, 81) + (Rational(-bignum_value, 4) ** -4).should == Rational(1, 452312848583266388373324160190187140051835877600158453279131187530910662656) + (Rational(3, -bignum_value) ** -4).should == Rational(115792089237316195423570985008687907853269984665640564039457584007913129639936, 81) + end + + # Guard against the Mathn library + guard -> { !defined?(Math.rsqrt) } do + it "returns Rational(1, 1) when the passed argument is 0" do + (Rational(3, 4) ** 0).should eql(Rational(1, 1)) + (Rational(-3, 4) ** 0).should eql(Rational(1, 1)) + (Rational(3, -4) ** 0).should eql(Rational(1, 1)) + + (Rational(bignum_value, 4) ** 0).should eql(Rational(1, 1)) + (Rational(3, -bignum_value) ** 0).should eql(Rational(1, 1)) + end + end + end + + describe "when passed Bignum" do + # #5713 + it "returns Rational(0) when self is Rational(0) and the exponent is positive" do + (Rational(0) ** bignum_value).should eql(Rational(0)) + end + + it "raises ZeroDivisionError when self is Rational(0) and the exponent is negative" do + -> { Rational(0) ** -bignum_value }.should raise_error(ZeroDivisionError) + end + + it "returns Rational(1) when self is Rational(1)" do + (Rational(1) ** bignum_value).should eql(Rational(1)) + (Rational(1) ** -bignum_value).should eql(Rational(1)) + end + + it "returns Rational(1) when self is Rational(-1) and the exponent is positive and even" do + (Rational(-1) ** bignum_value(0)).should eql(Rational(1)) + (Rational(-1) ** bignum_value(2)).should eql(Rational(1)) + end + + it "returns Rational(-1) when self is Rational(-1) and the exponent is positive and odd" do + (Rational(-1) ** bignum_value(1)).should eql(Rational(-1)) + (Rational(-1) ** bignum_value(3)).should eql(Rational(-1)) + end + + ruby_version_is ""..."3.4" do + it "returns positive Infinity when self is > 1" do + -> { + (Rational(2) ** bignum_value).infinite?.should == 1 + }.should complain(/warning: in a\*\*b, b may be too big/) + -> { + (Rational(fixnum_max) ** bignum_value).infinite?.should == 1 + }.should complain(/warning: in a\*\*b, b may be too big/) + end + + it "returns 0.0 when self is > 1 and the exponent is negative" do + -> { + (Rational(2) ** -bignum_value).should eql(0.0) + }.should complain(/warning: in a\*\*b, b may be too big/) + -> { + (Rational(fixnum_max) ** -bignum_value).should eql(0.0) + }.should complain(/warning: in a\*\*b, b may be too big/) + end + end + + ruby_version_is "3.4" do + it "raises an ArgumentError when self is > 1" do + -> { + (Rational(2) ** bignum_value) + }.should raise_error(ArgumentError) + -> { + (Rational(fixnum_max) ** bignum_value) + }.should raise_error(ArgumentError) + end + + it "raises an ArgumentError when self is > 1 and the exponent is negative" do + -> { + (Rational(2) ** -bignum_value) + }.should raise_error(ArgumentError) + -> { + (Rational(fixnum_max) ** -bignum_value) + }.should raise_error(ArgumentError) + end + + it "raises an ArgumentError when self is < -1" do + -> { + (Rational(-2) ** bignum_value) + }.should raise_error(ArgumentError) + -> { + (Rational(fixnum_min) ** bignum_value) + }.should raise_error(ArgumentError) + end + + it "raises an ArgumentError when self is < -1 and the exponent is negative" do + -> { + (Rational(-2) ** -bignum_value) + }.should raise_error(ArgumentError) + -> { + (Rational(fixnum_min) ** -bignum_value) + }.should raise_error(ArgumentError) + end + end + + # Fails on linux due to pow() bugs in glibc: http://sources.redhat.com/bugzilla/show_bug.cgi?id=3866 + platform_is_not :linux do + ruby_version_is ""..."3.4" do + it "returns positive Infinity when self < -1" do + -> { + (Rational(-2) ** bignum_value).infinite?.should == 1 + }.should complain(/warning: in a\*\*b, b may be too big/) + -> { + (Rational(-2) ** (bignum_value + 1)).infinite?.should == 1 + }.should complain(/warning: in a\*\*b, b may be too big/) + -> { + (Rational(fixnum_min) ** bignum_value).infinite?.should == 1 + }.should complain(/warning: in a\*\*b, b may be too big/) + end + + it "returns 0.0 when self is < -1 and the exponent is negative" do + -> { + (Rational(-2) ** -bignum_value).should eql(0.0) + }.should complain(/warning: in a\*\*b, b may be too big/) + -> { + (Rational(fixnum_min) ** -bignum_value).should eql(0.0) + }.should complain(/warning: in a\*\*b, b may be too big/) + end + end + end + end + + describe "when passed Float" do + it "returns self converted to Float and raised to the passed argument" do + (Rational(3, 1) ** 3.0).should eql(27.0) + (Rational(3, 1) ** 1.5).should be_close(5.19615242270663, TOLERANCE) + (Rational(3, 1) ** -1.5).should be_close(0.192450089729875, TOLERANCE) + end + + it "returns a complex number if self is negative and the passed argument is not 0" do + (Rational(-3, 2) ** 1.5).should be_close(Complex(0.0, -1.8371173070873836), TOLERANCE) + (Rational(3, -2) ** 1.5).should be_close(Complex(0.0, -1.8371173070873836), TOLERANCE) + (Rational(3, -2) ** -1.5).should be_close(Complex(0.0, 0.5443310539518174), TOLERANCE) + end + + it "returns Complex(1.0) when the passed argument is 0.0" do + (Rational(3, 4) ** 0.0).should == Complex(1.0) + (Rational(-3, 4) ** 0.0).should == Complex(1.0) + (Rational(-3, 4) ** 0.0).should == Complex(1.0) + end + end + + it "calls #coerce on the passed argument with self" do + rational = Rational(3, 4) + obj = mock("Object") + obj.should_receive(:coerce).with(rational).and_return([1, 2]) + + rational ** obj + end + + it "calls #** on the coerced Rational with the coerced Object" do + rational = Rational(3, 4) + + coerced_rational = mock("Coerced Rational") + coerced_rational.should_receive(:**).and_return(:result) + + coerced_obj = mock("Coerced Object") + + obj = mock("Object") + obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj]) + + (rational ** obj).should == :result + end + + it "raises ZeroDivisionError for Rational(0, 1) passed a negative Integer" do + [-1, -4, -9999].each do |exponent| + -> { Rational(0, 1) ** exponent }.should raise_error(ZeroDivisionError, "divided by 0") + end + end + + it "raises ZeroDivisionError for Rational(0, 1) passed a negative Rational with denominator 1" do + [Rational(-1, 1), Rational(-3, 1)].each do |exponent| + -> { Rational(0, 1) ** exponent }.should raise_error(ZeroDivisionError, "divided by 0") + end + end + + # #7513 + it "raises ZeroDivisionError for Rational(0, 1) passed a negative Rational" do + -> { Rational(0, 1) ** Rational(-3, 2) }.should raise_error(ZeroDivisionError, "divided by 0") + end + + it "returns Infinity for Rational(0, 1) passed a negative Float" do + [-1.0, -3.0, -3.14].each do |exponent| + (Rational(0, 1) ** exponent).infinite?.should == 1 + end + end +end diff --git a/spec/ruby/core/rational/fdiv_spec.rb b/spec/ruby/core/rational/fdiv_spec.rb new file mode 100644 index 0000000000..118d93dbe7 --- /dev/null +++ b/spec/ruby/core/rational/fdiv_spec.rb @@ -0,0 +1,5 @@ +require_relative "../../spec_helper" + +describe "Rational#fdiv" do + it "needs to be reviewed for spec completeness" +end diff --git a/spec/ruby/core/rational/fixtures/rational.rb b/spec/ruby/core/rational/fixtures/rational.rb new file mode 100644 index 0000000000..844d7f9820 --- /dev/null +++ b/spec/ruby/core/rational/fixtures/rational.rb @@ -0,0 +1,14 @@ +module RationalSpecs + class SubNumeric < Numeric + def initialize(value) + @value = Rational(value) + end + + def to_r + @value + end + end + + class CoerceError < StandardError + end +end diff --git a/spec/ruby/core/rational/floor_spec.rb b/spec/ruby/core/rational/floor_spec.rb new file mode 100644 index 0000000000..8068aaf119 --- /dev/null +++ b/spec/ruby/core/rational/floor_spec.rb @@ -0,0 +1,45 @@ +require_relative "../../spec_helper" + +describe "Rational#floor" do + before do + @rational = Rational(2200, 7) + end + + describe "with no arguments (precision = 0)" do + it "returns an integer" do + @rational.floor.should be_kind_of(Integer) + end + + it "returns the truncated value toward negative infinity" do + @rational.floor.should == 314 + Rational(1, 2).floor.should == 0 + Rational(-1, 2).floor.should == -1 + end + end + + describe "with a precision < 0" do + it "returns an integer" do + @rational.floor(-2).should be_kind_of(Integer) + @rational.floor(-1).should be_kind_of(Integer) + end + + it "moves the truncation point n decimal places left" do + @rational.floor(-3).should == 0 + @rational.floor(-2).should == 300 + @rational.floor(-1).should == 310 + end + end + + describe "with a precision > 0" do + it "returns a Rational" do + @rational.floor(1).should be_kind_of(Rational) + @rational.floor(2).should be_kind_of(Rational) + end + + it "moves the truncation point n decimal places right" do + @rational.floor(1).should == Rational(1571, 5) + @rational.floor(2).should == Rational(7857, 25) + @rational.floor(3).should == Rational(62857, 200) + end + end +end diff --git a/spec/ruby/core/rational/hash_spec.rb b/spec/ruby/core/rational/hash_spec.rb new file mode 100644 index 0000000000..528638056a --- /dev/null +++ b/spec/ruby/core/rational/hash_spec.rb @@ -0,0 +1,9 @@ +require_relative "../../spec_helper" + +describe "Rational#hash" do + # BUG: Rational(2, 3).hash == Rational(3, 2).hash + it "is static" do + Rational(2, 3).hash.should == Rational(2, 3).hash + Rational(2, 4).hash.should_not == Rational(2, 3).hash + end +end diff --git a/spec/ruby/core/rational/inspect_spec.rb b/spec/ruby/core/rational/inspect_spec.rb new file mode 100644 index 0000000000..edc5cffee9 --- /dev/null +++ b/spec/ruby/core/rational/inspect_spec.rb @@ -0,0 +1,14 @@ +require_relative "../../spec_helper" + +describe "Rational#inspect" do + it "returns a string representation of self" do + Rational(3, 4).inspect.should == "(3/4)" + Rational(-5, 8).inspect.should == "(-5/8)" + Rational(-1, -2).inspect.should == "(1/2)" + + # Guard against the Mathn library + guard -> { !defined?(Math.rsqrt) } do + Rational(bignum_value, 1).inspect.should == "(#{bignum_value}/1)" + end + end +end diff --git a/spec/ruby/core/rational/integer_spec.rb b/spec/ruby/core/rational/integer_spec.rb new file mode 100644 index 0000000000..be7476a9dd --- /dev/null +++ b/spec/ruby/core/rational/integer_spec.rb @@ -0,0 +1,13 @@ +require_relative "../../spec_helper" +describe "Rational#integer?" do + # Guard against the Mathn library + guard -> { !defined?(Math.rsqrt) } do + it "returns false for a rational with a numerator and no denominator" do + Rational(20).integer?.should be_false + end + end + + it "returns false for a rational with a numerator and a denominator" do + Rational(20,3).integer?.should be_false + end +end diff --git a/spec/ruby/core/rational/magnitude_spec.rb b/spec/ruby/core/rational/magnitude_spec.rb new file mode 100644 index 0000000000..f5f667edb1 --- /dev/null +++ b/spec/ruby/core/rational/magnitude_spec.rb @@ -0,0 +1,6 @@ +require_relative "../../spec_helper" +require_relative 'shared/abs' + +describe "Rational#abs" do + it_behaves_like :rational_abs, :magnitude +end diff --git a/spec/ruby/core/rational/marshal_dump_spec.rb b/spec/ruby/core/rational/marshal_dump_spec.rb new file mode 100644 index 0000000000..17a6107cd5 --- /dev/null +++ b/spec/ruby/core/rational/marshal_dump_spec.rb @@ -0,0 +1,11 @@ +require_relative '../../spec_helper' + +describe "Rational#marshal_dump" do + it "is a private method" do + Rational.should have_private_instance_method(:marshal_dump, false) + end + + it "dumps numerator and denominator" do + Rational(1, 2).send(:marshal_dump).should == [1, 2] + end +end diff --git a/spec/ruby/core/rational/minus_spec.rb b/spec/ruby/core/rational/minus_spec.rb new file mode 100644 index 0000000000..8aee85f9dd --- /dev/null +++ b/spec/ruby/core/rational/minus_spec.rb @@ -0,0 +1,51 @@ +require_relative '../../spec_helper' +require_relative 'shared/arithmetic_exception_in_coerce' + +describe "Rational#-" do + it_behaves_like :rational_arithmetic_exception_in_coerce, :- + + it "calls #coerce on the passed argument with self" do + rational = Rational(3, 4) + obj = mock("Object") + obj.should_receive(:coerce).with(rational).and_return([1, 2]) + + rational - obj + end + + it "calls #- on the coerced Rational with the coerced Object" do + rational = Rational(3, 4) + + coerced_rational = mock("Coerced Rational") + coerced_rational.should_receive(:-).and_return(:result) + + coerced_obj = mock("Coerced Object") + + obj = mock("Object") + obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj]) + + (rational - obj).should == :result + end +end + +describe "Rational#- passed a Rational" do + it "returns the result of subtracting other from self as a Rational" do + (Rational(3, 4) - Rational(0, 1)).should eql(Rational(3, 4)) + (Rational(3, 4) - Rational(1, 4)).should eql(Rational(1, 2)) + + (Rational(3, 4) - Rational(2, 1)).should eql(Rational(-5, 4)) + end +end + +describe "Rational#- passed a Float" do + it "returns the result of subtracting other from self as a Float" do + (Rational(3, 4) - 0.2).should eql(0.55) + (Rational(3, 4) - 2.5).should eql(-1.75) + end +end + +describe "Rational#- passed an Integer" do + it "returns the result of subtracting other from self as a Rational" do + (Rational(3, 4) - 1).should eql(Rational(-1, 4)) + (Rational(3, 4) - 2).should eql(Rational(-5, 4)) + end +end diff --git a/spec/ruby/core/rational/modulo_spec.rb b/spec/ruby/core/rational/modulo_spec.rb new file mode 100644 index 0000000000..23ed93e118 --- /dev/null +++ b/spec/ruby/core/rational/modulo_spec.rb @@ -0,0 +1,43 @@ +require_relative "../../spec_helper" + +describe "Rational#%" do + it "returns the remainder when this value is divided by other" do + (Rational(2, 3) % Rational(2, 3)).should == Rational(0, 1) + (Rational(4, 3) % Rational(2, 3)).should == Rational(0, 1) + (Rational(2, -3) % Rational(-2, 3)).should == Rational(0, 1) + (Rational(0, -1) % -1).should == Rational(0, 1) + + (Rational(7, 4) % Rational(1, 2)).should == Rational(1, 4) + (Rational(7, 4) % 1).should == Rational(3, 4) + (Rational(7, 4) % Rational(1, 7)).should == Rational(1, 28) + + (Rational(3, 4) % -1).should == Rational(-1, 4) + (Rational(1, -5) % -1).should == Rational(-1, 5) + end + + it "returns a Float value when the argument is Float" do + (Rational(7, 4) % 1.0).should be_kind_of(Float) + (Rational(7, 4) % 1.0).should == 0.75 + (Rational(7, 4) % 0.26).should be_close(0.19, 0.0001) + end + + it "raises ZeroDivisionError on zero denominator" do + -> { + Rational(3, 5) % Rational(0, 1) + }.should raise_error(ZeroDivisionError) + + -> { + Rational(0, 1) % Rational(0, 1) + }.should raise_error(ZeroDivisionError) + + -> { + Rational(3, 5) % 0 + }.should raise_error(ZeroDivisionError) + end + + it "raises a ZeroDivisionError when the argument is 0.0" do + -> { + Rational(3, 5) % 0.0 + }.should raise_error(ZeroDivisionError) + end +end diff --git a/spec/ruby/core/rational/multiply_spec.rb b/spec/ruby/core/rational/multiply_spec.rb new file mode 100644 index 0000000000..87fb4de2b4 --- /dev/null +++ b/spec/ruby/core/rational/multiply_spec.rb @@ -0,0 +1,65 @@ +require_relative "../../spec_helper" +require_relative 'shared/arithmetic_exception_in_coerce' + +describe "Rational#*" do + it "calls #coerce on the passed argument with self" do + rational = Rational(3, 4) + obj = mock("Object") + obj.should_receive(:coerce).with(rational).and_return([1, 2]) + + rational * obj + end + + it "calls #* on the coerced Rational with the coerced Object" do + rational = Rational(3, 4) + + coerced_rational = mock("Coerced Rational") + coerced_rational.should_receive(:*).and_return(:result) + + coerced_obj = mock("Coerced Object") + + obj = mock("Object") + obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj]) + + (rational * obj).should == :result + end + + it_behaves_like :rational_arithmetic_exception_in_coerce, :* +end + +describe "Rational#* passed a Rational" do + it "returns self divided by other as a Rational" do + (Rational(3, 4) * Rational(3, 4)).should eql(Rational(9, 16)) + (Rational(2, 4) * Rational(1, 4)).should eql(Rational(1, 8)) + + (Rational(3, 4) * Rational(0, 1)).should eql(Rational(0, 4)) + end +end + +describe "Rational#* passed a Float" do + it "returns self divided by other as a Float" do + (Rational(3, 4) * 0.75).should eql(0.5625) + (Rational(3, 4) * 0.25).should eql(0.1875) + (Rational(3, 4) * 0.3).should be_close(0.225, TOLERANCE) + + (Rational(-3, 4) * 0.3).should be_close(-0.225, TOLERANCE) + (Rational(3, -4) * 0.3).should be_close(-0.225, TOLERANCE) + (Rational(3, 4) * -0.3).should be_close(-0.225, TOLERANCE) + + (Rational(3, 4) * 0.0).should eql(0.0) + (Rational(-3, -4) * 0.0).should eql(0.0) + + (Rational(-3, 4) * 0.0).should eql(0.0) + (Rational(3, -4) * 0.0).should eql(0.0) + end +end + +describe "Rational#* passed an Integer" do + it "returns self divided by other as a Rational" do + (Rational(3, 4) * 2).should eql(Rational(3, 2)) + (Rational(2, 4) * 2).should eql(Rational(1, 1)) + (Rational(6, 7) * -2).should eql(Rational(-12, 7)) + + (Rational(3, 4) * 0).should eql(Rational(0, 4)) + end +end diff --git a/spec/ruby/core/rational/numerator_spec.rb b/spec/ruby/core/rational/numerator_spec.rb new file mode 100644 index 0000000000..2b9fe2ff5c --- /dev/null +++ b/spec/ruby/core/rational/numerator_spec.rb @@ -0,0 +1,10 @@ +require_relative "../../spec_helper" + +describe "Rational#numerator" do + it "returns the numerator" do + Rational(3, 4).numerator.should equal(3) + Rational(3, -4).numerator.should equal(-3) + + Rational(bignum_value, 1).numerator.should == bignum_value + end +end diff --git a/spec/ruby/core/rational/plus_spec.rb b/spec/ruby/core/rational/plus_spec.rb new file mode 100644 index 0000000000..01df5f6719 --- /dev/null +++ b/spec/ruby/core/rational/plus_spec.rb @@ -0,0 +1,50 @@ +require_relative "../../spec_helper" +require_relative 'shared/arithmetic_exception_in_coerce' + +describe "Rational#+" do + it "calls #coerce on the passed argument with self" do + rational = Rational(3, 4) + obj = mock("Object") + obj.should_receive(:coerce).with(rational).and_return([1, 2]) + + rational + obj + end + + it "calls #+ on the coerced Rational with the coerced Object" do + rational = Rational(3, 4) + + coerced_rational = mock("Coerced Rational") + coerced_rational.should_receive(:+).and_return(:result) + + coerced_obj = mock("Coerced Object") + + obj = mock("Object") + obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj]) + + (rational + obj).should == :result + end + + it_behaves_like :rational_arithmetic_exception_in_coerce, :+ +end + +describe "Rational#+ with a Rational" do + it "returns the result of subtracting other from self as a Rational" do + (Rational(3, 4) + Rational(0, 1)).should eql(Rational(3, 4)) + (Rational(3, 4) + Rational(1, 4)).should eql(Rational(1, 1)) + + (Rational(3, 4) + Rational(2, 1)).should eql(Rational(11, 4)) + end +end +describe "Rational#+ with a Float" do + it "returns the result of subtracting other from self as a Float" do + (Rational(3, 4) + 0.2).should eql(0.95) + (Rational(3, 4) + 2.5).should eql(3.25) + end +end + +describe "Rational#+ with an Integer" do + it "returns the result of subtracting other from self as a Rational" do + (Rational(3, 4) + 1).should eql(Rational(7, 4)) + (Rational(3, 4) + 2).should eql(Rational(11, 4)) + end +end diff --git a/spec/ruby/core/rational/quo_spec.rb b/spec/ruby/core/rational/quo_spec.rb new file mode 100644 index 0000000000..907898ad34 --- /dev/null +++ b/spec/ruby/core/rational/quo_spec.rb @@ -0,0 +1,25 @@ +require_relative "../../spec_helper" + +describe "Rational#quo" do + it "calls #coerce on the passed argument with self" do + rational = Rational(3, 4) + obj = mock("Object") + obj.should_receive(:coerce).with(rational).and_return([1, 2]) + + rational.quo(obj) + end + + it "calls #/ on the coerced Rational with the coerced Object" do + rational = Rational(3, 4) + + coerced_rational = mock("Coerced Rational") + coerced_rational.should_receive(:/).and_return(:result) + + coerced_obj = mock("Coerced Object") + + obj = mock("Object") + obj.should_receive(:coerce).and_return([coerced_rational, coerced_obj]) + + rational.quo(obj).should == :result + end +end diff --git a/spec/ruby/core/rational/rational_spec.rb b/spec/ruby/core/rational/rational_spec.rb new file mode 100644 index 0000000000..482deab38d --- /dev/null +++ b/spec/ruby/core/rational/rational_spec.rb @@ -0,0 +1,11 @@ +require_relative '../../spec_helper' + +describe "Rational" do + it "includes Comparable" do + Rational.include?(Comparable).should == true + end + + it "does not respond to new" do + -> { Rational.new(1) }.should raise_error(NoMethodError) + end +end diff --git a/spec/ruby/core/rational/rationalize_spec.rb b/spec/ruby/core/rational/rationalize_spec.rb new file mode 100644 index 0000000000..3db027d446 --- /dev/null +++ b/spec/ruby/core/rational/rationalize_spec.rb @@ -0,0 +1,36 @@ +require_relative '../../spec_helper' + +describe "Rational#rationalize" do + it "returns self with no argument" do + Rational(12,3).rationalize.should == Rational(12,3) + Rational(-45,7).rationalize.should == Rational(-45,7) + end + + # FIXME: These specs need reviewing by somebody familiar with the + # algorithm used by #rationalize + it "simplifies self to the degree specified by a Rational argument" do + r = Rational(5404319552844595,18014398509481984) + r.rationalize(Rational(1,10)).should == Rational(1,3) + r.rationalize(Rational(-1,10)).should == Rational(1,3) + + r = Rational(-5404319552844595,18014398509481984) + r.rationalize(Rational(1,10)).should == Rational(-1,3) + r.rationalize(Rational(-1,10)).should == Rational(-1,3) + + end + + it "simplifies self to the degree specified by a Float argument" do + r = Rational(5404319552844595,18014398509481984) + r.rationalize(0.05).should == Rational(1,3) + r.rationalize(0.001).should == Rational(3, 10) + + r = Rational(-5404319552844595,18014398509481984) + r.rationalize(0.05).should == Rational(-1,3) + r.rationalize(0.001).should == Rational(-3,10) + end + + it "raises ArgumentError when passed more than one argument" do + -> { Rational(1,1).rationalize(0.1, 0.1) }.should raise_error(ArgumentError) + -> { Rational(1,1).rationalize(0.1, 0.1, 2) }.should raise_error(ArgumentError) + end +end diff --git a/spec/ruby/core/rational/remainder_spec.rb b/spec/ruby/core/rational/remainder_spec.rb new file mode 100644 index 0000000000..86ba4674e6 --- /dev/null +++ b/spec/ruby/core/rational/remainder_spec.rb @@ -0,0 +1,5 @@ +require_relative "../../spec_helper" + +describe "Rational#remainder" do + it "needs to be reviewed for spec completeness" +end diff --git a/spec/ruby/core/rational/round_spec.rb b/spec/ruby/core/rational/round_spec.rb new file mode 100644 index 0000000000..ac3dcafe7b --- /dev/null +++ b/spec/ruby/core/rational/round_spec.rb @@ -0,0 +1,106 @@ +require_relative '../../spec_helper' + +describe "Rational#round" do + before do + @rational = Rational(2200, 7) + end + + describe "with no arguments (precision = 0)" do + it "returns an integer" do + @rational.round.should be_kind_of(Integer) + Rational(0, 1).round(0).should be_kind_of(Integer) + Rational(124, 1).round(0).should be_kind_of(Integer) + end + + it "returns the truncated value toward the nearest integer" do + @rational.round.should == 314 + Rational(0, 1).round(0).should == 0 + Rational(2, 1).round(0).should == 2 + end + + it "returns the rounded value toward the nearest integer" do + Rational(1, 2).round.should == 1 + Rational(-1, 2).round.should == -1 + Rational(3, 2).round.should == 2 + Rational(-3, 2).round.should == -2 + Rational(5, 2).round.should == 3 + Rational(-5, 2).round.should == -3 + end + end + + describe "with a precision < 0" do + it "returns an integer" do + @rational.round(-2).should be_kind_of(Integer) + @rational.round(-1).should be_kind_of(Integer) + Rational(0, 1).round(-1).should be_kind_of(Integer) + Rational(2, 1).round(-1).should be_kind_of(Integer) + end + + it "moves the truncation point n decimal places left" do + @rational.round(-3).should == 0 + @rational.round(-2).should == 300 + @rational.round(-1).should == 310 + end + end + + describe "with a precision > 0" do + it "returns a Rational" do + @rational.round(1).should be_kind_of(Rational) + @rational.round(2).should be_kind_of(Rational) + # Guard against the Mathn library + guard -> { !defined?(Math.rsqrt) } do + Rational(0, 1).round(1).should be_kind_of(Rational) + Rational(2, 1).round(1).should be_kind_of(Rational) + end + end + + it "moves the truncation point n decimal places right" do + @rational.round(1).should == Rational(3143, 10) + @rational.round(2).should == Rational(31429, 100) + @rational.round(3).should == Rational(157143, 500) + Rational(0, 1).round(1).should == Rational(0, 1) + Rational(2, 1).round(1).should == Rational(2, 1) + end + + it "doesn't alter the value if the precision is too great" do + Rational(3, 2).round(10).should == Rational(3, 2).round(20) + end + + # #6605 + it "doesn't fail when rounding to an absurdly large positive precision" do + Rational(3, 2).round(2_097_171).should == Rational(3, 2) + end + end + + describe "with half option" do + it "returns an Integer when precision is not passed" do + Rational(10, 4).round(half: nil).should == 3 + Rational(10, 4).round(half: :up).should == 3 + Rational(10, 4).round(half: :down).should == 2 + Rational(10, 4).round(half: :even).should == 2 + Rational(-10, 4).round(half: nil).should == -3 + Rational(-10, 4).round(half: :up).should == -3 + Rational(-10, 4).round(half: :down).should == -2 + Rational(-10, 4).round(half: :even).should == -2 + end + + it "returns a Rational when the precision is greater than 0" do + Rational(25, 100).round(1, half: nil).should == Rational(3, 10) + Rational(25, 100).round(1, half: :up).should == Rational(3, 10) + Rational(25, 100).round(1, half: :down).should == Rational(1, 5) + Rational(25, 100).round(1, half: :even).should == Rational(1, 5) + Rational(35, 100).round(1, half: nil).should == Rational(2, 5) + Rational(35, 100).round(1, half: :up).should == Rational(2, 5) + Rational(35, 100).round(1, half: :down).should == Rational(3, 10) + Rational(35, 100).round(1, half: :even).should == Rational(2, 5) + Rational(-25, 100).round(1, half: nil).should == Rational(-3, 10) + Rational(-25, 100).round(1, half: :up).should == Rational(-3, 10) + Rational(-25, 100).round(1, half: :down).should == Rational(-1, 5) + Rational(-25, 100).round(1, half: :even).should == Rational(-1, 5) + end + + it "raise for a non-existent round mode" do + -> { Rational(10, 4).round(half: :nonsense) }.should raise_error(ArgumentError, "invalid rounding mode: nonsense") + end + end +end diff --git a/spec/ruby/core/rational/shared/abs.rb b/spec/ruby/core/rational/shared/abs.rb new file mode 100644 index 0000000000..3d64bcc1a0 --- /dev/null +++ b/spec/ruby/core/rational/shared/abs.rb @@ -0,0 +1,11 @@ +require_relative '../../../spec_helper' + +describe :rational_abs, shared: true do + it "returns self's absolute value" do + Rational(3, 4).send(@method).should == Rational(3, 4) + Rational(-3, 4).send(@method).should == Rational(3, 4) + Rational(3, -4).send(@method).should == Rational(3, 4) + + Rational(bignum_value, -bignum_value).send(@method).should == Rational(bignum_value, bignum_value) + end +end diff --git a/spec/ruby/core/rational/shared/arithmetic_exception_in_coerce.rb b/spec/ruby/core/rational/shared/arithmetic_exception_in_coerce.rb new file mode 100644 index 0000000000..f4cf70d147 --- /dev/null +++ b/spec/ruby/core/rational/shared/arithmetic_exception_in_coerce.rb @@ -0,0 +1,11 @@ +require_relative '../fixtures/rational' + +describe :rational_arithmetic_exception_in_coerce, shared: true do + it "does not rescue exception raised in other#coerce" do + b = mock("numeric with failed #coerce") + b.should_receive(:coerce).and_raise(RationalSpecs::CoerceError) + + # e.g. Rational(3, 4) + b + -> { Rational(3, 4).send(@method, b) }.should raise_error(RationalSpecs::CoerceError) + end +end diff --git a/spec/ruby/core/rational/to_f_spec.rb b/spec/ruby/core/rational/to_f_spec.rb new file mode 100644 index 0000000000..d0da49d377 --- /dev/null +++ b/spec/ruby/core/rational/to_f_spec.rb @@ -0,0 +1,16 @@ +require_relative "../../spec_helper" + +describe "Rational#to_f" do + it "returns self converted to a Float" do + Rational(3, 4).to_f.should eql(0.75) + Rational(3, -4).to_f.should eql(-0.75) + Rational(-1, 4).to_f.should eql(-0.25) + Rational(-1, -4).to_f.should eql(0.25) + end + + it "converts to a Float for large numerator and denominator" do + num = 1000000000000000000000000000000000048148248609680896326399448564623182963452541226153892315137780403285956264146010000000000000000000000000000000000048148248609680896326399448564623182963452541226153892315137780403285956264146010000000000000000000000000000000000048148248609680896326399448564623182963452541226153892315137780403285956264146009 + den = 2000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 + Rational(num, den).to_f.should == 500.0 + end +end diff --git a/spec/ruby/core/rational/to_i_spec.rb b/spec/ruby/core/rational/to_i_spec.rb new file mode 100644 index 0000000000..520a380b2a --- /dev/null +++ b/spec/ruby/core/rational/to_i_spec.rb @@ -0,0 +1,12 @@ +require_relative "../../spec_helper" + +describe "Rational#to_i" do + it "converts self to an Integer by truncation" do + Rational(7, 4).to_i.should eql(1) + Rational(11, 4).to_i.should eql(2) + end + + it "converts self to an Integer by truncation" do + Rational(-7, 4).to_i.should eql(-1) + end +end diff --git a/spec/ruby/core/rational/to_r_spec.rb b/spec/ruby/core/rational/to_r_spec.rb new file mode 100644 index 0000000000..34f16d7890 --- /dev/null +++ b/spec/ruby/core/rational/to_r_spec.rb @@ -0,0 +1,26 @@ +require_relative "../../spec_helper" + +describe "Rational#to_r" do + it "returns self" do + a = Rational(3, 4) + a.to_r.should equal(a) + + a = Rational(bignum_value, 4) + a.to_r.should equal(a) + end + + it "raises TypeError trying to convert BasicObject" do + obj = BasicObject.new + -> { Rational(obj) }.should raise_error(TypeError) + end + + it "works when a BasicObject has to_r" do + obj = BasicObject.new; def obj.to_r; 1 / 2.to_r end + Rational(obj).should == Rational('1/2') + end + + it "fails when a BasicObject's to_r does not return a Rational" do + obj = BasicObject.new; def obj.to_r; 1 end + -> { Rational(obj) }.should raise_error(TypeError) + end +end diff --git a/spec/ruby/core/rational/to_s_spec.rb b/spec/ruby/core/rational/to_s_spec.rb new file mode 100644 index 0000000000..24e30778e5 --- /dev/null +++ b/spec/ruby/core/rational/to_s_spec.rb @@ -0,0 +1,14 @@ +require_relative "../../spec_helper" + +describe "Rational#to_s" do + it "returns a string representation of self" do + # Guard against the Mathn library + guard -> { !defined?(Math.rsqrt) } do + Rational(1, 1).to_s.should == "1/1" + Rational(2, 1).to_s.should == "2/1" + end + Rational(1, 2).to_s.should == "1/2" + Rational(-1, 3).to_s.should == "-1/3" + Rational(1, -3).to_s.should == "-1/3" + end +end diff --git a/spec/ruby/core/rational/truncate_spec.rb b/spec/ruby/core/rational/truncate_spec.rb new file mode 100644 index 0000000000..728fca34ea --- /dev/null +++ b/spec/ruby/core/rational/truncate_spec.rb @@ -0,0 +1,71 @@ +require_relative "../../spec_helper" + +describe "Rational#truncate" do + before do + @rational = Rational(2200, 7) + end + + describe "with no arguments (precision = 0)" do + it "returns an integer" do + @rational.truncate.should be_kind_of(Integer) + end + + it "returns the truncated value toward 0" do + @rational.truncate.should == 314 + Rational(1, 2).truncate.should == 0 + Rational(-1, 2).truncate.should == 0 + end + end + + describe "with an explicit precision = 0" do + it "returns an integer" do + @rational.truncate(0).should be_kind_of(Integer) + end + + it "returns the truncated value toward 0" do + @rational.truncate(0).should == 314 + Rational(1, 2).truncate(0).should == 0 + Rational(-1, 2).truncate(0).should == 0 + end + end + + describe "with a precision < 0" do + it "returns an integer" do + @rational.truncate(-2).should be_kind_of(Integer) + @rational.truncate(-1).should be_kind_of(Integer) + end + + it "moves the truncation point n decimal places left" do + @rational.truncate(-3).should == 0 + @rational.truncate(-2).should == 300 + @rational.truncate(-1).should == 310 + end + end + + describe "with a precision > 0" do + it "returns a Rational" do + @rational.truncate(1).should be_kind_of(Rational) + @rational.truncate(2).should be_kind_of(Rational) + end + + it "moves the truncation point n decimal places right" do + @rational.truncate(1).should == Rational(1571, 5) + @rational.truncate(2).should == Rational(7857, 25) + @rational.truncate(3).should == Rational(62857, 200) + end + end + + describe "with an invalid value for precision" do + it "raises a TypeError" do + -> { @rational.truncate(nil) }.should raise_error(TypeError, "not an integer") + -> { @rational.truncate(1.0) }.should raise_error(TypeError, "not an integer") + -> { @rational.truncate('') }.should raise_error(TypeError, "not an integer") + end + + it "does not call to_int on the argument" do + object = Object.new + object.should_not_receive(:to_int) + -> { @rational.truncate(object) }.should raise_error(TypeError, "not an integer") + end + end +end diff --git a/spec/ruby/core/rational/zero_spec.rb b/spec/ruby/core/rational/zero_spec.rb new file mode 100644 index 0000000000..af7fb391ac --- /dev/null +++ b/spec/ruby/core/rational/zero_spec.rb @@ -0,0 +1,14 @@ +require_relative "../../spec_helper" +describe "Rational#zero?" do + it "returns true if the numerator is 0" do + Rational(0,26).zero?.should be_true + end + + it "returns true if the numerator is 0.0" do + Rational(0.0,26).zero?.should be_true + end + + it "returns false if the numerator isn't 0" do + Rational(26).zero?.should be_false + end +end |