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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
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
-> { Math.atan2(1.0, "test") }.should raise_error(TypeError)
-> { Math.atan2("test", 0.0) }.should raise_error(TypeError)
-> { Math.atan2("test", "this") }.should raise_error(TypeError)
end
it "raises a TypeError if the argument is nil" do
-> { Math.atan2(nil, 1.0) }.should raise_error(TypeError)
-> { Math.atan2(-1.0, nil) }.should raise_error(TypeError)
-> { 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
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