require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)

describe "Math.sinh" do
  it "returns a float" do
    Math.sinh(1.2).should be_kind_of(Float)
  end

  it "returns the hyperbolic sin of the argument" do
    Math.sinh(0.0).should == 0.0
    Math.sinh(-0.0).should == 0.0
    Math.sinh(1.5).should be_close(2.12927945509482, TOLERANCE)
    Math.sinh(-2.8).should be_close(-8.19191835423591, TOLERANCE)
  end

  it "raises a TypeError if the argument cannot be coerced with Float()" do
    lambda { Math.sinh("test") }.should raise_error(TypeError)
  end

  it "returns NaN given NaN" do
    Math.sinh(nan_value).nan?.should be_true
  end

  it "raises a TypeError if the argument is nil" do
    lambda { Math.sinh(nil) }.should raise_error(TypeError)
  end

  it "accepts any argument that can be coerced with Float()" do
    Math.sinh(MathSpecs::Float.new).should be_close(1.1752011936438, TOLERANCE)
  end
end

describe "Math#sinh" do
  it "is accessible as a private instance method" do
    IncludesMath.new.send(:sinh, 1.99).should be_close(3.58941916843202, TOLERANCE)
  end
end