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Diffstat (limited to 'spec/ruby/core/math/acosh_spec.rb')
-rw-r--r-- | spec/ruby/core/math/acosh_spec.rb | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/spec/ruby/core/math/acosh_spec.rb b/spec/ruby/core/math/acosh_spec.rb new file mode 100644 index 0000000000..272bfaf6a9 --- /dev/null +++ b/spec/ruby/core/math/acosh_spec.rb @@ -0,0 +1,43 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Math.acosh" do + it "returns a float" do + Math.acosh(1.0).should be_kind_of(Float) + end + + it "returns the principle value of the inverse hyperbolic cosine of the argument" do + Math.acosh(14.2).should be_close(3.345146999647, TOLERANCE) + Math.acosh(1.0).should be_close(0.0, TOLERANCE) + end + + conflicts_with :Complex do + it "raises Errno::EDOM if the passed argument is less than -1.0 or greater than 1.0" do + lambda { Math.acosh(1.0 - TOLERANCE) }.should raise_error(Errno::EDOM) + lambda { Math.acosh(0) }.should raise_error(Errno::EDOM) + lambda { Math.acosh(-1.0) }.should raise_error(Errno::EDOM) + end + end + + it "raises a TypeError if the argument cannot be coerced with Float()" do + lambda { Math.acosh("test") }.should raise_error(TypeError) + end + + it "returns NaN given NaN" do + Math.acosh(nan_value).nan?.should be_true + end + + it "raises a TypeError if the argument is nil" do + lambda { Math.acosh(nil) }.should raise_error(TypeError) + end + + it "accepts any argument that can be coerced with Float()" do + Math.acosh(MathSpecs::Float.new).should == 0.0 + end +end + +describe "Math#acosh" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:acosh, 1.0).should be_close(0.0, TOLERANCE) + end +end |