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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
# arccosine : (-1.0, 1.0) --> (0, PI)
describe "Math.acos" do
before(:each) do
ScratchPad.clear
end
it "returns a float" do
Math.acos(1).should be_kind_of(Float )
end
it "returns the arccosine of the argument" do
Math.acos(1).should be_close(0.0, TOLERANCE)
Math.acos(0).should be_close(1.5707963267949, TOLERANCE)
Math.acos(-1).should be_close(Math::PI,TOLERANCE)
Math.acos(0.25).should be_close(1.31811607165282, TOLERANCE)
Math.acos(0.50).should be_close(1.0471975511966 , TOLERANCE)
Math.acos(0.75).should be_close(0.722734247813416, TOLERANCE)
end
conflicts_with :Complex do
it "raises an Errno::EDOM if the argument is greater than 1.0" do
lambda { Math.acos(1.0001) }.should raise_error(Errno::EDOM)
end
it "raises an Errno::EDOM if the argument is less than -1.0" do
lambda { Math.acos(-1.0001) }.should raise_error(Errno::EDOM)
end
end
ruby_version_is ""..."1.9" do
it "raises an ArgumentError if the string argument cannot be coerced with Float()" do
lambda { Math.acos("test") }.should raise_error(ArgumentError)
end
it "raises Errno::EDOM given NaN" do
lambda { Math.acos(nan_value) }.should raise_error(Errno::EDOM)
end
end
ruby_version_is "1.9" do
it "raises a TypeError if the string argument cannot be coerced with Float()" do
lambda { Math.acos("test") }.should raise_error(TypeError)
end
it "returns NaN given NaN" do
Math.acos(nan_value).nan?.should be_true
end
end
it "raises an TypeError if the argument cannot be coerced with Float()" do
lambda { Math.acos(MathSpecs::UserClass.new) }.should raise_error(TypeError)
end
it "raises a TypeError if the argument is nil" do
lambda { Math.acos(nil) }.should raise_error(TypeError)
end
it "accepts any argument that can be coerced with Float()" do
Math.acos(MathSpecs::Float.new(0.5)).should be_close(Math.acos(0.5), TOLERANCE)
end
ruby_version_is ""..."1.9" do
it "coerces string argument with Float() without calling to_f" do
s = MathSpecs::StringSubClass.new("0.5")
s.should_not_receive(:to_f)
Math.acos(s).should be_close(Math.acos(0.5), TOLERANCE)
end
end
end
describe "Math#acos" do
it "is accessible as a private instance method" do
IncludesMath.new.send(:acos, 0).should be_close(1.5707963267949, TOLERANCE)
end
end
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