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Diffstat (limited to 'spec/ruby/core/math/exp_spec.rb')
-rw-r--r-- | spec/ruby/core/math/exp_spec.rb | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/spec/ruby/core/math/exp_spec.rb b/spec/ruby/core/math/exp_spec.rb new file mode 100644 index 0000000000..a727404462 --- /dev/null +++ b/spec/ruby/core/math/exp_spec.rb @@ -0,0 +1,37 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +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 + lambda { 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 + lambda { 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 |