diff options
Diffstat (limited to 'spec/ruby/core/math/atan2_spec.rb')
-rw-r--r-- | spec/ruby/core/math/atan2_spec.rb | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/math/atan2_spec.rb b/spec/ruby/core/math/atan2_spec.rb new file mode 100644 index 0000000000..ef8f9bb78f --- /dev/null +++ b/spec/ruby/core/math/atan2_spec.rb @@ -0,0 +1,54 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Math.atan2" do + it "returns a float" do + Math.atan2(1.2, 0.5).should be_kind_of(Float) + end + + it "returns the arc tangent of y, x" do + Math.atan2(4.2, 0.3).should be_close(1.49948886200961, TOLERANCE) + Math.atan2(0.0, 1.0).should be_close(0.0, TOLERANCE) + Math.atan2(-9.1, 3.2).should be_close(-1.23265379809025, TOLERANCE) + Math.atan2(7.22, -3.3).should be_close(1.99950888779256, TOLERANCE) + end + + it "raises a TypeError if the argument cannot be coerced with Float()" do + lambda { Math.atan2(1.0, "test") }.should raise_error(TypeError) + lambda { Math.atan2("test", 0.0) }.should raise_error(TypeError) + lambda { Math.atan2("test", "this") }.should raise_error(TypeError) + end + + it "raises a TypeError if the argument is nil" do + lambda { Math.atan2(nil, 1.0) }.should raise_error(TypeError) + lambda { Math.atan2(-1.0, nil) }.should raise_error(TypeError) + lambda { Math.atan2(nil, nil) }.should raise_error(TypeError) + end + + it "accepts any argument that can be coerced with Float()" do + Math.atan2(MathSpecs::Float.new, MathSpecs::Float.new).should be_close(0.785398163397448, TOLERANCE) + end + + it "returns positive zero when passed 0.0, 0.0" do + Math.atan2(0.0, 0.0).should be_positive_zero + end + + it "returns negative zero when passed -0.0, 0.0" do + Math.atan2(-0.0, 0.0).should be_negative_zero + end + + it "returns Pi when passed 0.0, -0.0" do + Math.atan2(0.0, -0.0).should == Math::PI + end + + it "returns -Pi when passed -0.0, -0.0" do + Math.atan2(-0.0, -0.0).should == -Math::PI + end + +end + +describe "Math#atan2" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:atan2, 1.1, 2.2).should be_close(0.463647609000806, TOLERANCE) + end +end |