My final solution to the SudokuValidator problem.

.rspec

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+--color
+--drb
+--format documentation

Gemfile

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+source 'https://rubygems.org'
+ruby '2.0.0'
+
+gem "rspec", "~> 2.14.1"
+gem 'guard-spork'
+gem 'terminal-notifier-guard'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    celluloid (0.15.2)
+      timers (~> 1.1.0)
+    childprocess (0.3.9)
+      ffi (~> 1.0, >= 1.0.11)
+    coderay (1.1.0)
+    diff-lcs (1.2.5)
+    ffi (1.9.3)
+    formatador (0.2.4)
+    guard (2.2.5)
+      formatador (>= 0.2.4)
+      listen (~> 2.1)
+      lumberjack (~> 1.0)
+      pry (>= 0.9.12)
+      thor (>= 0.18.1)
+    guard-spork (1.5.0)
+      childprocess (>= 0.2.3)
+      guard (>= 1.1)
+      spork (>= 0.8.4)
+    listen (2.4.0)
+      celluloid (>= 0.15.2)
+      rb-fsevent (>= 0.9.3)
+      rb-inotify (>= 0.9)
+    lumberjack (1.0.4)
+    method_source (0.8.2)
+    pry (0.9.12.4)
+      coderay (~> 1.0)
+      method_source (~> 0.8)
+      slop (~> 3.4)
+    rb-fsevent (0.9.3)
+    rb-inotify (0.9.3)
+      ffi (>= 0.5.0)
+    rspec (2.14.1)
+      rspec-core (~> 2.14.0)
+      rspec-expectations (~> 2.14.0)
+      rspec-mocks (~> 2.14.0)
+    rspec-core (2.14.7)
+    rspec-expectations (2.14.4)
+      diff-lcs (>= 1.1.3, < 2.0)
+    rspec-mocks (2.14.4)
+    slop (3.4.7)
+    spork (1.0.0rc4)
+    terminal-notifier-guard (1.5.3)
+    thor (0.18.1)
+    timers (1.1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  guard-spork
+  rspec (~> 2.14.1)
+  terminal-notifier-guard

Guardfile

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+# A sample Guardfile
+# More info at https://github.com/guard/guard#readme
+
+guard 'spork', :cucumber_env => { 'RAILS_ENV' => 'test' }, :rspec_env => { 'RAILS_ENV' => 'test' } do
+ watch('Gemfile')
+ watch('lib/sudoku_validator.rb')
+  watch('spec/sudoku_validator_spec.rb')
+  watch('spec/spec_helper.rb') { :rspec }
+
+end
+
+guard 'rspec', all_after_pass: false do
+end
+

examples/one_row.sudoku

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+8 5 9 |6 1 2 |4 3 7 

examples/one_row_invalid.sudoku

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+8 5 9 |6 1 2 |4 3 3

examples/three_row.sudoku

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+8 5 9 |6 1 2 |4 3 7 
+7 2 3 |8 5 4 |1 6 9 
+1 6 4 |3 7 9 |5 2 8 
+------+------+------

examples/three_row_incomplete.sudoku

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+8 5 . |. . 2 |4 . . 
+7 2 3 |8 5 4 |1 6 9 
+1 6 4 |3 7 9 |5 2 8 
+------+------+------

examples/three_row_invalid.sudoku

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+8 5 9 |6 1 2 |4 3 7 
+7 2 3 |8 5 4 |1 6 9 
+1 6 4 |3 7 9 |5 2 2 
+------+------+------

examples/two_row.sudoku

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+8 5 9 |6 1 2 |4 3 7 
+7 2 3 |8 5 4 |1 6 9  

lib/sudoku_parser.rb

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+class SudokuParser
+	def initialize(file)
+		@file = File.new(file, "r")
+	end
+
+	def parse
+		sudoku_array = []
+		counter = 1
+    while (line = @file.gets)
+    	next if line.index('-')
+    	line = remove_bars(line)
+    	sudoku_array << convert_string_to_array(line).collect{|i| i.to_i}
+    end
+    @file.close
+		sudoku_array
+  end
+
+  def remove_bars(line)
+    line.gsub('|', '')   
+  end
+  def convert_string_to_array(string)
+  	string.split(' ')
+  end
+end

lib/sudoku_validator.rb

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+class SudokuValidator
+	def initialize(sudoku = [])
+		@sudoku = sudoku
+		@rows = get_rows
+		@columns = get_columns
+		@grids = get_grids
+	end
+
+	def get_rows
+		@sudoku
+	end
+
+	def get_columns
+    @sudoku.transpose
+	end
+
+	def get_grids
+		a = @sudoku
+		grids = []
+	sub_grid = []
+
+		(0..2).each do |j|
+		(0..2).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+	  end
+
+    grids << sub_grid
+    sub_grid = []
+(0..2).each do |j|
+		(3..5).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+
+    end
+
+ grids << sub_grid
+	  sub_grid = []
+	   (0..2).each do |j|
+			(6..8).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+	   end
+
+	   grids << sub_grid
+	sub_grid = []
+
+		(3..5).each do |j|
+		(0..2).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+	  end
+
+    grids << sub_grid
+    sub_grid = []
+(3..5).each do |j|
+		(3..5).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+
+    end
+
+ grids << sub_grid
+	  sub_grid = []
+	 (3..5).each do |j|
+			(6..8).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+	   end
+
+
+	   	sub_grid = []
+
+		(6..8).each do |j|
+		(0..2).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+	  end
+
+    grids << sub_grid
+    sub_grid = []
+(6..8).each do |j|
+		(3..5).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+
+    end
+
+ grids << sub_grid
+	  sub_grid = []
+	 (6..8).each do |j|
+			(6..8).each do |i|
+	      sub_grid <<  a[j][i]
+	    end
+	   end
+
+grids << sub_grid
+		grids
+	end
+
+  def validate_row(row)
+		row.collect{|i| i.to_i}.sort.join == "123456789"
+	end
+
+	def validate_column(column)
+		column.collect{|i| i.to_i}.sort.join == "123456789"
+  end
+
+  def validate_grid(grid)
+  	grid.collect{|i| i.to_i}.sort.join == "123456789"
+  end
+
+
+	def validate_rows
+		@rows.each do |row|
+			if validate_row(row)
+				next
+			else
+				return false
+			end
+			return true
+		end
+  end
+
+	def validate_columns
+		@columns.each do |column|
+			if validate_column(column)
+				next
+			else
+				return false
+			end
+			return true
+		end
+  end
+
+  def validate_grids
+  		@grids.each do |grid|
+  		if validate_grid(grid)
+				next
+			else
+			  return false
+			end
+			return true
+		end
+  end
+
+	def validate
+		if validate_rows && validate_columns && validate_grids
+			"This sudoku is valid."
+		else
+			"This sudoku is invalid."
+		end
+	end
+end

one_row.sudoku

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+8 5 9 |6 1 2 |4 3 7 

spec/spec_helper.rb

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+require 'rubygems'
+require 'spork'
+
+Spork.prefork do
+  ENV["RAILS_ENV"] ||= 'test'
+  require 'rspec/autorun'
+
+  RSpec.configure do |config|
+  end
+end
+
+Spork.each_run do
+  # This code will be run each time you run your specs.
+
+end

spec/sudoku_parser_spec.rb

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+require 'spec_helper'
+require_relative '../lib/sudoku_parser'
+describe SudokuParser do
+	context "#parse" do
+		it "returns the one row sudoku in an array" do
+			parser = SudokuParser.new('examples/one_row.sudoku')
+			result = parser.parse
+		  result.should eq([[8, 5, 9, 6, 1, 2, 4, 3, 7 ]])
+		end
+
+		it "returns the two sudoku in an array" do
+			parser = SudokuParser.new('examples/two_row.sudoku')
+			result = parser.parse
+		  result.should eq([[8, 5, 9, 6, 1, 2, 4, 3, 7 ],[7 ,2, 3 ,8, 5, 4, 1, 6, 9]])
+		end
+
+		it "returns the three sudoku in an array" do
+			parser = SudokuParser.new('examples/three_row.sudoku')
+			result = parser.parse
+		  result.should eq([[8,5, 9, 6, 1, 2, 4, 3, 7 ],[7 ,2, 3 ,8, 5, 4, 1, 6, 9],[1, 6, 4, 3, 7, 9, 5, 2, 8 ]])
+		end
+
+		it "returns the three incomplete row sudoku in an array by replacing empty values with zero" do
+			parser = SudokuParser.new('examples/three_row_incomplete.sudoku')
+			result = parser.parse
+		  result.should eq([[8, 5, 0, 0, 0, 2, 4, 0, 0], [7, 2, 3, 8, 5, 4, 1, 6, 9], [1, 6, 4, 3, 7, 9, 5, 2, 8]])
+		end
+
+		it "returns the full sudoku in an array" do
+			parser = SudokuParser.new('valid_complete.sudoku')
+			result = parser.parse
+		  result.should eq([[8, 5, 9, 6, 1, 2, 4, 3, 7],
+		   								 [7, 2, 3, 8, 5, 4, 1, 6, 9],
+		   								  [1, 6, 4, 3, 7, 9, 5, 2, 8], 
+		   								   [9, 8, 6, 1, 4, 7, 3, 5, 2], 
+		   								  [3, 7, 5, 2, 6, 8, 9, 1, 4], 
+		   								  [2, 4, 1, 5, 9, 3, 7, 8, 6], 
+		   								  [4, 3, 2, 9, 8, 1, 6, 7, 5], 
+		   								  [6, 1, 7, 4, 2, 5, 8, 9, 3],
+		   								   [5, 9, 8, 7, 3, 6, 2, 4, 1]])
+		end
+
+		it "returns the full incomplete sudoku in an array" do
+			parser = SudokuParser.new('valid_incomplete.sudoku')
+			result = parser.parse
+		  result.should eq([[8, 5, 0, 0, 0, 2, 4, 0, 0],
+		  								 [7, 2, 0, 0, 0, 0, 0, 0, 9],
+		  								  [0, 0, 4, 0, 0, 0, 0, 0, 0], 
+		  								  [0, 0, 0, 1, 0, 7, 0, 0, 2], 
+		  								  [3, 0, 5, 0, 0, 0, 9, 0, 0],
+		  								  [0, 4, 0, 0, 0, 0, 0, 0, 0],
+		  								  [0, 0, 0, 0, 8, 0, 0, 7, 0], 
+		  								  [0, 1, 7, 0, 0, 0, 0, 0, 0], 
+		  								  [0, 0, 0, 0, 3, 6, 0, 4, 0]])
+		end
+	end
+end