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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Math.frexp" do
it "returns the normalized fraction and exponent" do
frac, exp = Math.frexp(102.83)
frac.should be_close(0.803359375, TOLERANCE)
exp.should == 7
end
ruby_version_is ""..."1.9" do
it "raises an ArgumentError if the argument cannot be coerced with Float()" do
lambda { Math.frexp("test") }.should raise_error(ArgumentError)
end
end
ruby_version_is "1.9" do
it "raises a TypeError if the argument cannot be coerced with Float()" do
lambda { Math.frexp("test") }.should raise_error(TypeError)
end
end
it "returns NaN given NaN" do
frac, exp = Math.frexp(nan_value)
frac.nan?.should be_true
exp.should == 0
end
it "raises a TypeError if the argument is nil" do
lambda { Math.frexp(nil) }.should raise_error(TypeError)
end
it "accepts any argument that can be coerced with Float()" do
frac, exp = Math.frexp(MathSpecs::Float.new)
frac.should be_close(0.5, TOLERANCE)
exp.should == 1
end
end
describe "Math#frexp" do
it "is accessible as a private instance method" do
frac, exp = IncludesMath.new.send(:frexp, 2.1415)
frac.should be_close(0.535375, TOLERANCE)
exp.should == 2
end
end
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