Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/mathn/math/fixtures/classes.rb

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+class IncludesMath
+  include Math
+end

spec/ruby/library/mathn/math/rsqrt_spec.rb

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+require File.expand_path('../../../../spec_helper', __FILE__)
+
+ruby_version_is ''...'2.5' do
+  require File.expand_path('../shared/rsqrt', __FILE__)
+
+  describe "Math#rsqrt" do
+    it_behaves_like :mathn_math_rsqrt, :_, IncludesMath.new
+
+    it "is a private instance method" do
+      IncludesMath.should have_private_instance_method(:rsqrt)
+    end
+  end
+
+  describe "Math.rsqrt" do
+    it_behaves_like :mathn_math_rsqrt, :_, Math
+  end
+end

spec/ruby/library/mathn/math/shared/rsqrt.rb

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+require 'mathn'
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+describe :mathn_math_rsqrt, shared: true do
+  it "returns the square root for Rational numbers" do
+    @object.send(:rsqrt, Rational(9, 25)).should == Rational(3, 5)
+    @object.send(:rsqrt, 16/64).should == Rational(1, 2)
+  end
+
+  it "returns the square root for positive numbers" do
+    @object.send(:rsqrt, 1).should == 1
+    @object.send(:rsqrt, 4.0).should == 2.0
+    @object.send(:rsqrt, 12.34).should == Math.sqrt!(12.34)
+  end
+
+  it "raises an Math::DomainError if the argument is a negative number" do
+    lambda { @object.send(:rsqrt, -1) }.should raise_error(Math::DomainError)
+    lambda { @object.send(:rsqrt, -4.0) }.should raise_error(Math::DomainError)
+    lambda { @object.send(:rsqrt, -16/64) }.should raise_error(Math::DomainError)
+  end
+end

spec/ruby/library/mathn/math/shared/sqrt.rb

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+require 'mathn'
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+describe :mathn_math_sqrt, shared: true do
+  it "returns the square root for Rational numbers" do
+    @object.send(:sqrt, Rational(9, 25)).should == Rational(3, 5)
+    @object.send(:sqrt, 16/64).should == Rational(1, 2)
+  end
+
+  it "returns the square root for Complex numbers" do
+    @object.send(:sqrt, Complex(1, 0)).should == 1
+  end
+
+  it "returns the square root for positive numbers" do
+    @object.send(:sqrt, 1).should == 1
+    @object.send(:sqrt, 4.0).should == 2.0
+    @object.send(:sqrt, 12.34).should == Math.sqrt!(12.34)
+  end
+
+  it "returns the square root for negative numbers" do
+    @object.send(:sqrt, -9).should == Complex(0, 3)
+    @object.send(:sqrt, -5.29).should == Complex(0, 2.3)
+    @object.send(:sqrt, -16/64).should == Complex(0, 1/2)
+  end
+end

spec/ruby/library/mathn/math/sqrt_spec.rb

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+require File.expand_path('../../../../spec_helper', __FILE__)
+
+ruby_version_is ''...'2.5' do
+  require File.expand_path('../shared/sqrt', __FILE__)
+
+  describe "Math#rsqrt" do
+    it_behaves_like :mathn_math_sqrt, :_, IncludesMath.new
+
+    it "is a private instance method" do
+      IncludesMath.should have_private_instance_method(:sqrt)
+    end
+  end
+
+  describe "Math.rsqrt" do
+    it_behaves_like :mathn_math_sqrt, :_, Math
+  end
+end