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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
-> { 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
-> { 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
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