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/matrix/zero_spec.rb

@@ -0,0 +1,52 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require 'matrix'
+
+describe "Matrix.zero" do
+  it "returns an object of type Matrix" do
+    Matrix.zero(3).should be_kind_of(Matrix)
+  end
+
+  it "creates a n x n matrix" do
+    m3 = Matrix.zero(3)
+    m3.row_size.should == 3
+    m3.column_size.should == 3
+
+    m8 = Matrix.zero(8)
+    m8.row_size.should == 8
+    m8.column_size.should == 8
+  end
+
+  it "initializes all cells to 0" do
+    size = 10
+    m = Matrix.zero(size)
+
+    (0...size).each do |i|
+      (0...size).each do |j|
+        m[i, j].should == 0
+      end
+    end
+  end
+
+  describe "for a subclass of Matrix" do
+    it "returns an instance of that subclass" do
+      MatrixSub.zero(3).should be_an_instance_of(MatrixSub)
+    end
+  end
+end
+
+describe "Matrix.zero?" do
+  it "returns true for empty matrices" do
+    Matrix.empty.zero?.should == true
+    Matrix.empty(3,0).zero?.should == true
+    Matrix.empty(0,3).zero?.should == true
+  end
+
+  it "returns true for matrices with zero entries" do
+    Matrix.zero(2,3).zero?.should == true
+  end
+
+  it "returns false for matrices with non zero entries" do
+    Matrix[[1]].zero?.should == false
+  end
+end