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Contents
require File.dirname(File.join(__rhoGetCurrentDir(), __FILE__)) + '/../../spec_helper'
require File.dirname(File.join(__rhoGetCurrentDir(), __FILE__)) + '/fixtures/classes'
# The natural logarithm, having base Math::E
describe "Math.log" do
it "returns a float" do
Math.log(1).class.should == Float
end
it "returns the natural logarithm of the argument" do
Math.log(0.0001).should be_close(-9.21034037197618, TOLERANCE)
Math.log(0.000000000001e-15).should be_close(-62.1697975108392, TOLERANCE)
Math.log(1).should be_close(0.0, TOLERANCE)
Math.log(10).should be_close( 2.30258509299405, TOLERANCE)
Math.log(10e15).should be_close(36.8413614879047, TOLERANCE)
end
conflicts_with :Complex do
it "raises an Errno::EDOM if the argument is less than 0" do
lambda { Math.log(-1e-15) }.should raise_error(Errno::EDOM)
end
end
it "raises an ArgumentError if the argument cannot be coerced with Float()" do
lambda { Math.log("test") }.should raise_error(ArgumentError)
end
it "raises a TypeError if the argument is nil" do
lambda { Math.log(nil) }.should raise_error(TypeError)
end
it "accepts any argument that can be coerced with Float()" do
Math.log(MathSpecs::Float.new).should be_close(0.0, TOLERANCE)
end
end
describe "Math#log" do
it "is accessible as a private instance method" do
IncludesMath.new.send(:log, 5.21).should be_close(1.65057985576528, TOLERANCE)
end
end
Version data entries
19 entries across 19 versions & 1 rubygems