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401b64c4e8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
39 lines
1.2 KiB
Ruby
39 lines
1.2 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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describe "Math.tanh" do
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it "returns a float" do
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Math.tanh(0.5).should be_kind_of(Float)
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end
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it "returns the hyperbolic tangent of the argument" do
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Math.tanh(0.0).should == 0.0
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Math.tanh(-0.0).should == -0.0
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Math.tanh(infinity_value).should == 1.0
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Math.tanh(-infinity_value).should == -1.0
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Math.tanh(2.5).should be_close(0.98661429815143, TOLERANCE)
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Math.tanh(-4.892).should be_close(-0.999887314427707, 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.tanh("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.tanh(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.tanh(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.tanh(MathSpecs::Float.new).should be_close(0.761594155955765, TOLERANCE)
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end
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end
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describe "Math#tanh" do
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it "is accessible as a private instance method" do
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IncludesMath.new.send(:tanh, 5.21).should be_close(0.99994034202065, TOLERANCE)
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end
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end
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