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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Math.acosh" do
it "returns a float" do
Math.acosh(1.0).should be_kind_of(Float)
end
it "returns the principle value of the inverse hyperbolic cosine of the argument" do
Math.acosh(14.2).should be_close(3.345146999647, TOLERANCE)
Math.acosh(1.0).should be_close(0.0, TOLERANCE)
end
conflicts_with :Complex do
it "raises Errno::EDOM if the passed argument is less than -1.0 or greater than 1.0" do
lambda { Math.acosh(1.0 - TOLERANCE) }.should raise_error(Errno::EDOM)
lambda { Math.acosh(0) }.should raise_error(Errno::EDOM)
lambda { Math.acosh(-1.0) }.should raise_error(Errno::EDOM)
end
end
it "raises a TypeError if the argument cannot be coerced with Float()" do
lambda { Math.acosh("test") }.should raise_error(TypeError)
end
it "returns NaN given NaN" do
Math.acosh(nan_value).nan?.should be_true
end
it "raises a TypeError if the argument is nil" do
lambda { Math.acosh(nil) }.should raise_error(TypeError)
end
it "accepts any argument that can be coerced with Float()" do
Math.acosh(MathSpecs::Float.new).should == 0.0
end
end
describe "Math#acosh" do
it "is accessible as a private instance method" do
IncludesMath.new.send(:acosh, 1.0).should be_close(0.0, TOLERANCE)
end
end
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