1 files changed, 54 insertions, 0 deletions
diff --git a/spec/rubyspec/core/math/atan2_spec.rb b/spec/rubyspec/core/math/atan2_spec.rb
new file mode 100644
index 0000000000..ef8f9bb78f
--- /dev/null
+++ b/spec/rubyspec/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