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401b64c4e8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
40 lines
1.3 KiB
Ruby
40 lines
1.3 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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# arctangent : (-Inf, Inf) --> (-PI/2, PI/2)
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describe "Math.atan" do
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it "returns a float" do
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Math.atan(1).should be_kind_of(Float)
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end
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it "returns the arctangent of the argument" do
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Math.atan(1).should be_close(Math::PI/4, TOLERANCE)
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Math.atan(0).should be_close(0.0, TOLERANCE)
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Math.atan(-1).should be_close(-Math::PI/4, TOLERANCE)
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Math.atan(0.25).should be_close(0.244978663126864, TOLERANCE)
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Math.atan(0.50).should be_close(0.463647609000806, TOLERANCE)
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Math.atan(0.75).should be_close(0.643501108793284, TOLERANCE)
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end
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it "raises a TypeError if the argument cannot be coerced with Float()" do
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lambda { Math.atan("test") }.should raise_error(TypeError)
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end
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it "returns NaN given NaN" do
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Math.atan(nan_value).nan?.should be_true
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end
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it "raises a TypeError if the argument is nil" do
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lambda { Math.atan(nil) }.should raise_error(TypeError)
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end
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it "accepts any argument that can be coerced with Float()" do
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Math.atan(MathSpecs::Float.new).should be_close(0.785398163397448, TOLERANCE)
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end
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end
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describe "Math#atan" do
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it "is accessible as a private instance method" do
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IncludesMath.new.send(:atan, 3.1415).should be_close(1.2626187313511, TOLERANCE)
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end
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end
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