require_relative '../../spec_helper' require_relative 'fixtures/classes' describe "Math.exp" do it "returns a float" do Math.exp(1.0).should be_kind_of(Float) end it "returns the base-e exponential of the argument" do Math.exp(0.0).should == 1.0 Math.exp(-0.0).should == 1.0 Math.exp(-1.8).should be_close(0.165298888221587, TOLERANCE) Math.exp(1.25).should be_close(3.49034295746184, TOLERANCE) end it "raises a TypeError if the argument cannot be coerced with Float()" do lambda { Math.exp("test") }.should raise_error(TypeError) end it "returns NaN given NaN" do Math.exp(nan_value).nan?.should be_true end it "raises a TypeError if the argument is nil" do lambda { Math.exp(nil) }.should raise_error(TypeError) end it "accepts any argument that can be coerced with Float()" do Math.exp(MathSpecs::Float.new).should be_close(Math::E, TOLERANCE) end end describe "Math#exp" do it "is accessible as a private instance method" do IncludesMath.new.send(:exp, 23.1415).should be_close(11226018484.0012, TOLERANCE) end end