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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Math.sqrt" do
it "returns a float" do
Math.sqrt(1).should be_kind_of(Float)
end
it "returns the square root of the argument" do
Math.sqrt(1).should == 1.0
Math.sqrt(4.0).should == 2.0
Math.sqrt(15241578780673814.441547445).should be_close(123456789.123457, TOLERANCE)
end
ruby_version_is ""..."1.9" do
it "raises an ArgumentError if the argument cannot be coerced with Float()" do
lambda { Math.sqrt("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.sqrt("test") }.should raise_error(TypeError)
end
it "returns NaN given NaN" do
Math.sqrt(nan_value).nan?.should be_true
end
end
it "raises a TypeError if the argument is nil" do
lambda { Math.sqrt(nil) }.should raise_error(TypeError)
end
it "accepts any argument that can be coerced with Float()" do
Math.sqrt(MathSpecs::Float.new).should be_close(1.0, TOLERANCE)
end
end
describe "Math#sqrt" do
it "is accessible as a private instance method" do
IncludesMath.new.send(:sqrt, 2.23).should be_close(1.49331845230681, TOLERANCE)
end
end
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