diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..c822796
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,52 @@
+require: rubocop-rspec
+
+##
+## TEMPORARILY disabled 
+##
+
+
+##
+## LOCAL PREFERENCES
+##
+# Allow bigger test cases ('examples')
+RSpec/ExampleLength:
+  Enabled: true
+  Max: 8
+
+Metrics/BlockLength:
+  Enabled: false
+  Exclude: 
+    - spec/**/*
+
+Metrics/AbcSize:
+  Enabled: false
+
+# Disable errors due to rspec-specific patterns
+RSpec/DescribedClass:
+  Enabled: false
+
+##
+## DISABLE all layout/whitespace-related errors 
+## 
+
+RSpec/FilePath:
+  Enabled: false
+
+Style/IfUnlessModifier:
+  Enabled: false
+
+Style/MultilineIfThen:
+  Enabled: false
+
+# Style/FileName:
+# Enabled: false
+
+# Style/StringLiterals:
+# Enabled: false
+
+Style/FormatString:
+  Enabled: false
+
+Style/Documentation:
+  Enabled: false
+
diff --git a/Gemfile b/Gemfile
index 09700ba..ed0f987 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,6 +5,7 @@ gem 'thor'
 gem 'rly'
 gem 'pry'
 gem 'opal'
-
+gem 'rubocop'
+gem 'rubocop-rspec'
 # Specify your gem's dependencies in mm2ep_depend.gemspec
 gemspec
diff --git a/Rakefile b/Rakefile
index c9f6049..37fe42a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,21 +1,21 @@
 require "bundler/gem_tasks"
 require "rake/testtask"
-# require 'rubocop/rake_task'
+require 'rubocop/rake_task'
 
 # Add additional test suite definitions to the default test task here
-# namespace :spec do
-#   desc 'Runs RuboCop on specified directories'
-#   RuboCop::RakeTask.new(:rubocop) do |task|
-#     # Dirs: app, lib, test
-#     task.patterns = ['exe/**/*.rb', 'lib/**/*.rb', 'spec/**/*_spec.rb']
-#
-#     # Make it easier to disable cops.
-#     task.options << "--display-cop-names"
-#
-#     # Abort on failures (fix your code first)
-#     task.fail_on_error = true
-#   end
-# end
+namespace :spec do
+  desc 'Runs RuboCop on specified directories'
+  RuboCop::RakeTask.new(:rubocop) do |task|
+    # Dirs: app, lib, test
+    task.patterns = ['exe/**/*.rb', 'lib/**/*.rb', 'spec/**/*_spec.rb']
+
+    # Make it easier to disable cops.
+    task.options << "--display-cop-names"
+
+    # Abort on failures (fix your code first)
+    task.fail_on_error = true
+  end
+end
 
 Rake::TestTask.new(:spec) do |t|
   t.libs << "spec"
diff --git a/exe/mm2ep-depend b/exe/mm2ep-depend
index 2d1c964..1a0fa74 100755
--- a/exe/mm2ep-depend
+++ b/exe/mm2ep-depend
@@ -20,9 +20,9 @@ module Mm2ep
         vars.each do |var|
           tab_vars[var.split('=')[0]] = var.split('=')[1]
         end
-        
+        binding.pry
         # Give vars name and value from shell command to parser
-        parser.names(tab_vars)
+        parser.names=tab_vars
 
         token = parser.parse(line.chomp, true)
         pp token
diff --git a/lib/mm2ep_depend.rb b/lib/mm2ep_depend.rb
index 1230d3e..77d76bc 100644
--- a/lib/mm2ep_depend.rb
+++ b/lib/mm2ep_depend.rb
@@ -1,5 +1,4 @@
-require "mm2ep_depend/version"
-
+require 'mm2ep_depend/version'
 
 module Mm2epDepend
   # Your code goes here...
diff --git a/lib/mm2ep_depend/lexer.rb b/lib/mm2ep_depend/lexer.rb
index c54d9a1..91d1e2f 100755
--- a/lib/mm2ep_depend/lexer.rb
+++ b/lib/mm2ep_depend/lexer.rb
@@ -1,7 +1,6 @@
 module Mm2ep
   module Depend
     class Lexer < Rly::Lex
-
       ignore "\t\n "
 
       # token :SPACE, /\s+/
@@ -9,7 +8,7 @@ module Mm2ep
       token :R_PAR, /\)/
       token :NUMBER, /[0-9]+(\.[0-9]+)?/
       token :STRING, /"([^"]*)"/ do |s|
-        s.value.gsub!(/"(.*)"/,'\1')
+        s.value.gsub!(/"(.*)"/, '\1')
         s
       end
 
@@ -26,7 +25,6 @@ module Mm2ep
         t.lexer.pos += 1
         nil
       end
-
     end # class
   end # module
 end # module
diff --git a/lib/mm2ep_depend/parser.rb b/lib/mm2ep_depend/parser.rb
index b0bbebe..ca28d5c 100755
--- a/lib/mm2ep_depend/parser.rb
+++ b/lib/mm2ep_depend/parser.rb
@@ -18,12 +18,9 @@ module Mm2ep
     end
 
     class VarValue < TreeValue
-      def initialize str, value
+      def initialize(str, value)
         @name = str
-        @value = case value
-                 when /true/i then true
-                 when /false/i then false
-                 end
+        @value = value
       end
 
       def compute
@@ -36,8 +33,8 @@ module Mm2ep
     end
 
     class NumberValue < TreeValue
-      def initialize str
-        @value = str.to_i
+      def initialize(str)
+        @value = str
       end
 
       def compute
@@ -50,7 +47,7 @@ module Mm2ep
     end
 
     class StringValue < TreeValue
-      def initialize str
+      def initialize(str)
         @value = str
       end
 
@@ -64,12 +61,8 @@ module Mm2ep
     end
 
     class BoolValue < TreeValue
-      def initialize str
-        @value = case str
-                 when /true/i then true
-                 when /false/i then false
-                 end
-
+      def initialize(str)
+        @value = str
       end
 
       def compute
@@ -82,69 +75,69 @@ module Mm2ep
     end
 
     class AndOp < TreeExpr
-      def initialize expr1, expr2
-          @expr1 = expr1
-          @expr2 = expr2
+      def initialize(expr1, expr2)
+        @expr1 = expr1
+        @expr2 = expr2
       end
 
       def compute
-        return @expr1.compute && @expr2.compute
+        @expr1.compute && @expr2.compute
       end
 
       def to_s
-        "( #{@expr1.to_s} ) AND ( #{@expr2.to_s} )"
+        "( #{@expr1} ) AND ( #{@expr2} )"
       end
     end
 
     class OrOp
-      def initialize expr1, expr2
-          @expr1 = expr1
-          @expr2 = expr2
+      def initialize(expr1, expr2)
+        @expr1 = expr1
+        @expr2 = expr2
       end
 
       def compute
-        return @expr1.compute || @expr2.compute
+        @expr1.compute || @expr2.compute
       end
 
       def to_s
-        "( #{@expr1.to_s} ) OR ( #{@expr2.to_s} )"
+        "( #{@expr1} ) OR ( #{@expr2} )"
       end
     end
 
     class NotOp
-      def initialize expr
+      def initialize(expr)
         @expr = expr
       end
 
       def compute
-        return ! @expr.compute
+        !@expr.compute
       end
 
       def to_s
-        "NOT ( #{@expr.to_s} )"
+        "NOT ( #{@expr} )"
       end
     end
 
     class EqOp
-      def initialize lval, rval
+      def initialize(lval, rval)
         @lval = lval
         @rval = rval
       end
 
       def compute
-        return @lval.value == @rval.value
+        @lval.value.eql? @rval.value
       end
 
       def to_s
-        "#{@lval.to_s} = #{@rval.to_s}"
+        "#{@lval} = #{@rval}"
       end
     end
 
     class Parser < Rly::Yacc
-
-      def names tab
-        @names = tab
-      end
+      attr_writer :names
+      # def names(tab)
+      #   @names = tab
+      # end
 
       precedence :left, :OR_OP
       precedence :left, :AND_OP
@@ -163,11 +156,11 @@ module Mm2ep
         )
       end
 
-      rule 'bool_expr : F_BOOL'do |ex, l|
+      rule 'bool_expr : F_BOOL' do |ex, l|
         ex.value = l.value
       end
 
-      rule 'bool_expr : T_BOOL'do |ex, l|
+      rule 'bool_expr : T_BOOL' do |ex, l|
         ex.value = l.value
       end
 
@@ -175,23 +168,23 @@ module Mm2ep
         ex.value = BoolValue.new(l.value.to_s)
       end
 
-      rule 'expr : expr OR_OP expr' do |ex, l, e, r|
+      rule 'expr : expr OR_OP expr' do |ex, l, _e, r|
         ex.value = OrOp.new(l.value, r.value)
       end
 
-      rule 'expr : expr AND_OP expr' do |ex, l, e, r|
+      rule 'expr : expr AND_OP expr' do |ex, l, _e, r|
         ex.value = AndOp.new(l.value, r.value)
       end
 
-      rule 'expr : L_PAR expr R_PAR' do |ex, l, e, r|
+      rule 'expr : L_PAR expr R_PAR' do |ex, _l, e, _r|
         ex.value = e.value
       end
 
-      rule 'expr : NOT_OP expr %prec UMINUS' do |ex, l, e|
+      rule 'expr : NOT_OP expr %prec UMINUS' do |ex, _l, e|
         ex.value = NotOp.new(e.value)
       end
 
-      rule 'expr : VAR EQ_OP bool_expr' do |ex, v, eq, n|
+      rule 'expr : VAR EQ_OP bool_expr' do |ex, v, _eq, n|
         # binding.pry
         ex.value = EqOp.new(
           VarValue.new(v.value.to_s, @names[v.value]),
@@ -199,20 +192,19 @@ module Mm2ep
         )
       end
 
-      rule 'expr : VAR EQ_OP STRING' do |ex, v, eq, n|
+      rule 'expr : VAR EQ_OP STRING' do |ex, v, _eq, n|
         ex.value = EqOp.new(
           VarValue.new(v.value.to_s, @names[v.value]),
           StringValue.new(n.value)
         )
       end
 
-      rule 'expr : VAR EQ_OP NUMBER' do |ex, v, eq, n|
+      rule 'expr : VAR EQ_OP NUMBER' do |ex, v, _eq, n|
         ex.value = EqOp.new(
           VarValue.new(v.value.to_s, @names[v.value]),
           NumberValue.new(n.value)
         )
       end
-
     end # class
   end # module
 end # module
diff --git a/lib/mm2ep_depend/version.rb b/lib/mm2ep_depend/version.rb
index de3f3e9..1ddecea 100644
--- a/lib/mm2ep_depend/version.rb
+++ b/lib/mm2ep_depend/version.rb
@@ -1,3 +1,3 @@
 module Mm2epDepend
-  VERSION = "0.1.0"
+  VERSION = '0.1.0'.freeze
 end
diff --git a/spec/files/simple_eq_expr_boolexpr.txt b/spec/files/simple_eq_expr_boolexpr.txt
new file mode 100644
index 0000000..78cef52
--- /dev/null
+++ b/spec/files/simple_eq_expr_boolexpr.txt
@@ -0,0 +1 @@
+truc_bidule = true
diff --git a/spec/files/simple_eq_expr_number.txt b/spec/files/simple_eq_expr_number.txt
new file mode 100644
index 0000000..fa02120
--- /dev/null
+++ b/spec/files/simple_eq_expr_number.txt
@@ -0,0 +1 @@
+truc_bidule = 10
diff --git a/spec/files/simple_eq_expr_string.txt b/spec/files/simple_eq_expr_string.txt
new file mode 100644
index 0000000..9822ccf
--- /dev/null
+++ b/spec/files/simple_eq_expr_string.txt
@@ -0,0 +1 @@
+truc_bidule = "test"
diff --git a/spec/files/simple_expr_and_expr.txt b/spec/files/simple_expr_and_expr.txt
new file mode 100644
index 0000000..96c37e2
--- /dev/null
+++ b/spec/files/simple_expr_and_expr.txt
@@ -0,0 +1 @@
+truc_bidule and machin
diff --git a/spec/files/simple_expr_or_expr.txt b/spec/files/simple_expr_or_expr.txt
new file mode 100644
index 0000000..8a8fa22
--- /dev/null
+++ b/spec/files/simple_expr_or_expr.txt
@@ -0,0 +1 @@
+truc_bidule or machin
diff --git a/spec/files/simple_not_expr.txt b/spec/files/simple_not_expr.txt
new file mode 100644
index 0000000..62edc3b
--- /dev/null
+++ b/spec/files/simple_not_expr.txt
@@ -0,0 +1 @@
+NOT true
diff --git a/spec/files/test.txt b/spec/files/test.txt
deleted file mode 100644
index 8c1de09..0000000
--- a/spec/files/test.txt
+++ /dev/null
@@ -1 +0,0 @@
-NOT ( truc_bidule = false )
diff --git a/spec/mm2ep_depend/parser_spec.rb b/spec/mm2ep_depend/parser_spec.rb
index 7306b15..c16e40e 100644
--- a/spec/mm2ep_depend/parser_spec.rb
+++ b/spec/mm2ep_depend/parser_spec.rb
@@ -3,18 +3,139 @@ require 'mm2ep_depend'
 
 describe Mm2ep::Depend::Parser do
 
-  it 'has to evaluate expression and give right answer' do
-    line = File.read(testfile('test2.txt')).gsub(/\n/,'')
+  it 'has to apply not on expr' do
+    line = File.read(testfile('simple_not_expr.txt')).delete("\n")
     parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
-    parser.names({'truc_bidule' => 'true',
-                  'machin' => 'true',
-                  'truc' => 'false'
-                  })
     token = parser.parse(line.chomp)
     assert_equal(false, token.compute)
   end
 
-  # it 'has to be true' do
-  #
-  # end
+  it 'has to evaluate eq with bool expr and return true' do
+    line = File.read(testfile('simple_eq_expr_boolexpr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'true'}
+    token = parser.parse(line.chomp)
+    assert_equal(true, token.compute)
+  end
+
+  it 'has to evaluate eq with bool expr and return false' do
+    line = File.read(testfile('simple_eq_expr_boolexpr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'false'}
+    token = parser.parse(line.chomp)
+    assert_equal(false, token.compute)
+  end
+
+  it 'has to evaluate eq with number and return true' do
+    line = File.read(testfile('simple_eq_expr_number.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => '10'}
+    token = parser.parse(line.chomp)
+    assert_equal(true, token.compute)
+  end
+
+  it 'has to evaluate eq with number and return false' do
+    line = File.read(testfile('simple_eq_expr_number.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => '11'}
+    token = parser.parse(line.chomp)
+    assert_equal(false, token.compute)
+  end
+
+  it 'has to evaluate eq with string and return true' do
+    line = File.read(testfile('simple_eq_expr_string.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'test'}
+    token = parser.parse(line.chomp)
+    assert_equal(true, token.compute)
+  end
+
+  it 'has to evaluate eq with string and return false' do
+    line = File.read(testfile('simple_eq_expr_string.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'tes'}
+    token = parser.parse(line.chomp)
+    assert_equal(false, token.compute)
+  end
+
+  it 'has to evaluate true OR true and return true' do
+    line = File.read(testfile('simple_or_expr_string.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'true',
+                  'machin' => 'true'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(true, token.compute)
+  end
+
+  it 'has to evaluate true OR false and return true' do
+    line = File.read(testfile('simple_expr_or_expr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'true',
+                  'machin' => 'false'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(true, token.compute)
+  end
+
+  it 'has to evaluate false OR true and return true' do
+    line = File.read(testfile('simple_expr_or_expr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'false',
+                  'machin' => 'true'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(true, token.compute)
+  end
+
+  it 'has to evaluate false OR false and return false' do
+    line = File.read(testfile('simple_expr_or_expr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'false',
+                  'machin' => 'false'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(false, token.compute)
+  end
+
+  it 'has to evaluate true AND true and return true' do
+    line = File.read(testfile('simple_expr_and_expr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'true',
+                  'machin' => 'true'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(true, token.compute)
+  end
+
+  it 'has to evaluate true AND false and return false' do
+    line = File.read(testfile('simple_expr_and_expr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'true',
+                  'machin' => 'false'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(false, token.compute)
+  end
+
+  it 'has to evaluate false AND true and return false' do
+    line = File.read(testfile('simple_expr_and_expr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'false',
+                  'machin' => 'true'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(false, token.compute)
+  end
+
+  it 'has to evaluate false AND false and return false' do
+    line = File.read(testfile('simple_expr_and_expr.txt')).delete("\n")
+    parser = Mm2ep::Depend::Parser.new(Mm2ep::Depend::Lexer.new)
+    parser.names={'truc_bidule' => 'false',
+                  'machin' => 'false'
+                 }
+    token = parser.parse(line.chomp)
+    assert_equal(false, token.compute)
+  end
+
 end