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401b64c4e8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
43 lines
1.5 KiB
Ruby
43 lines
1.5 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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# erfc is the complementary error function
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describe "Math.erfc" do
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it "returns a float" do
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Math.erf(1).should be_kind_of(Float)
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end
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it "returns the complementary error function of the argument" do
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Math.erfc(0).should be_close(1.0, TOLERANCE)
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Math.erfc(1).should be_close(0.157299207050285, TOLERANCE)
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Math.erfc(-1).should be_close(1.84270079294971, TOLERANCE)
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Math.erfc(0.5).should be_close(0.479500122186953, TOLERANCE)
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Math.erfc(-0.5).should be_close(1.52049987781305, TOLERANCE)
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Math.erfc(10000).should be_close(0.0, TOLERANCE)
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Math.erfc(-10000).should be_close(2.0, TOLERANCE)
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Math.erfc(0.00000000000001).should be_close(0.999999999999989, TOLERANCE)
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Math.erfc(-0.00000000000001).should be_close(1.00000000000001, 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.erfc("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.erfc(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.erfc(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.erfc(MathSpecs::Float.new).should be_close(0.157299207050285, TOLERANCE)
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end
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end
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describe "Math#erfc" do
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it "is accessible as a private instance method" do
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IncludesMath.new.send(:erf, 3.1415).should be_close(0.999991118444483, TOLERANCE)
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end
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end
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