1 files changed, 52 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/zero_spec.rb b/spec/ruby/library/matrix/zero_spec.rb
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+++ b/spec/ruby/library/matrix/zero_spec.rb
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+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require 'matrix'
+
+describe "Matrix.zero" do
+  it "returns an object of type Matrix" do
+    Matrix.zero(3).should.is_a?(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.instance_of?(MatrixSub)
+    end
+  end
+end
+
+describe "Matrix.zero?" do
+  it "returns true for empty matrices" do
+    Matrix.empty.should.zero?
+    Matrix.empty(3,0).should.zero?
+    Matrix.empty(0,3).should.zero?
+  end
+
+  it "returns true for matrices with zero entries" do
+    Matrix.zero(2,3).should.zero?
+  end
+
+  it "returns false for matrices with non zero entries" do
+    Matrix[[1]].should_not.zero?
+  end
+end