ruby--ruby/spec/rubyspec/core/float/shared/modulo.rb

describe :float_modulo, shared: true do
  it "returns self modulo other" do
    6543.21.send(@method, 137).should be_close(104.21, TOLERANCE)
    5667.19.send(@method, bignum_value).should be_close(5667.19, TOLERANCE)
    6543.21.send(@method, 137.24).should be_close(92.9299999999996, TOLERANCE)

    -1.0.send(@method, 1).should == 0
  end

  it "returns self when modulus is +Infinity" do
    4.2.send(@method, Float::INFINITY).should == 4.2
  end

  it "returns -Infinity when modulus is -Infinity" do
    4.2.send(@method, -Float::INFINITY).should == -Float::INFINITY
  end

  it "returns NaN when called on NaN or Infinities" do
    Float::NAN.send(@method, 42).should be_nan
    Float::INFINITY.send(@method, 42).should be_nan
    (-Float::INFINITY).send(@method, 42).should be_nan
  end

  it "returns NaN when modulus is NaN" do
    4.2.send(@method, Float::NAN).should be_nan
  end

  it "returns -0.0 when called on -0.0 with a non zero modulus" do
    r = (-0.0).send(@method, 42)
    r.should == 0
    (1/r).should < 0

    r = (-0.0).send(@method, Float::INFINITY)
    r.should == 0
    (1/r).should < 0
  end

  it "raises a ZeroDivisionError if other is zero" do
    lambda { 1.0.send(@method, 0) }.should raise_error(ZeroDivisionError)
    lambda { 1.0.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
  end
end