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Diffstat (limited to 'spec/ruby/core/math/tan_spec.rb')
-rw-r--r-- | spec/ruby/core/math/tan_spec.rb | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/spec/ruby/core/math/tan_spec.rb b/spec/ruby/core/math/tan_spec.rb new file mode 100644 index 0000000000..0318ef8a14 --- /dev/null +++ b/spec/ruby/core/math/tan_spec.rb @@ -0,0 +1,42 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Math.tan" do + it "returns a float" do + Math.tan(1.35).should be_kind_of(Float) + end + + it "returns the tangent of the argument" do + Math.tan(0.0).should == 0.0 + Math.tan(-0.0).should == -0.0 + Math.tan(4.22).should be_close(1.86406937682395, TOLERANCE) + Math.tan(-9.65).should be_close(-0.229109052606441, TOLERANCE) + end + + it "returns NaN if called with +-Infinitty" do + Math.tan(infinity_value).nan?.should == true + Math.tan(-infinity_value).nan?.should == true + end + + it "raises a TypeError if the argument cannot be coerced with Float()" do + lambda { Math.tan("test") }.should raise_error(TypeError) + end + + it "returns NaN given NaN" do + Math.tan(nan_value).nan?.should be_true + end + + it "raises a TypeError if the argument is nil" do + lambda { Math.tan(nil) }.should raise_error(TypeError) + end + + it "accepts any argument that can be coerced with Float()" do + Math.tan(MathSpecs::Float.new).should be_close(1.5574077246549, TOLERANCE) + end +end + +describe "Math#tan" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:tan, 1.0).should be_close(1.5574077246549, TOLERANCE) + end +end |