1 files changed, 67 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/scalar_spec.rb b/spec/ruby/library/matrix/scalar_spec.rb
new file mode 100644
index 0000000000..3da8771471
--- /dev/null
+++ b/spec/ruby/library/matrix/scalar_spec.rb
@@ -0,0 +1,67 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'matrix'
+
+describe "Matrix.scalar" do
+
+  before :each do
+    @side = 3
+    @value = 8
+    @a = Matrix.scalar(@side, @value)
+  end
+
+  it "returns a Matrix" do
+    @a.should be_kind_of(Matrix)
+  end
+
+  it "returns a n x n matrix" do
+    @a.row_size.should == @side
+    @a.column_size.should == @side
+  end
+
+  it "initializes diagonal to value" do
+    (0...@a.row_size).each do |i|
+      @a[i, i].should == @value
+    end
+  end
+
+  it "initializes all non-diagonal values to 0" do
+    (0...@a.row_size).each do |i|
+      (0...@a.column_size).each do |j|
+        if i != j
+          @a[i, j].should == 0
+        end
+      end
+    end
+  end
+
+  before :each do
+    @side = 3
+    @value = 8
+    @a = Matrix.scalar(@side, @value)
+  end
+
+  it "returns a Matrix" do
+    @a.should be_kind_of(Matrix)
+  end
+
+  it "returns a square matrix, where the first argument specifies the side of the square" do
+    @a.row_size.should == @side
+    @a.column_size.should == @side
+  end
+
+  it "puts the second argument in all diagonal values" do
+    (0...@a.row_size).each do |i|
+      @a[i, i].should == @value
+    end
+  end
+
+  it "fills all values not on the main diagonal with 0" do
+    (0...@a.row_size).each do |i|
+      (0...@a.column_size).each do |j|
+        if i != j
+          @a[i, j].should == 0
+        end
+      end
+    end
+  end
+end