require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Math.cosh" do it "returns a float" do Math.cosh(1.0).should be_kind_of(Float) end it "returns the hyperbolic cosine of the argument" do Math.cosh(0.0).should == 1.0 Math.cosh(-0.0).should == 1.0 Math.cosh(1.5).should be_close(2.35240961524325, TOLERANCE) Math.cosh(-2.99).should be_close(9.96798496414416, TOLERANCE) end it "raises a TypeError if the argument cannot be coerced with Float()" do lambda { Math.cosh("test") }.should raise_error(TypeError) end it "returns NaN given NaN" do Math.cosh(nan_value).nan?.should be_true end it "raises a TypeError if the argument is nil" do lambda { Math.cosh(nil) }.should raise_error(TypeError) end it "accepts any argument that can be coerced with Float()" do Math.cosh(MathSpecs::Float.new).should be_close(1.54308063481524, TOLERANCE) end end describe "Math#cosh" do it "is accessible as a private instance method" do IncludesMath.new.send(:cos, 3.1415).should be_close(-0.999999995707656, TOLERANCE) end end