diff --git a/lib/software_database.rb b/lib/software_database.rb
index 95e78c7..5912b1f 100644
--- a/lib/software_database.rb
+++ b/lib/software_database.rb
@@ -8,5 +8,4 @@ class SoftwareDatabase < ActiveRecord::Base
   validates_length_of :operating_system, maximum: 20, too_long: _("Software database is too long (maximum is 20 characters)")
 
   validates_presence_of :database_description_id, :version, :operating_system
-
 end
diff --git a/test/unit/software_database_test.rb b/test/unit/software_database_test.rb
new file mode 100644
index 0000000..ad8b915
--- /dev/null
+++ b/test/unit/software_database_test.rb
@@ -0,0 +1,39 @@
+require File.dirname(__FILE__) + '/../../../../test/test_helper'
+
+class SoftwareDatabaseTest < ActiveSupport::TestCase
+  DatabaseDescription.create!(name: "MySQL")
+
+  def setup
+    @software_database = SoftwareDatabase.new(:version => "1.0", :operating_system => "Debian")
+    @software_database.database_description_id = 1
+  end
+
+  should "save if all informations are filled" do
+    assert @software_database.save, "Database should have been saved" 
+  end
+  
+  should "not save if database description id is empty" do
+    @software_database.database_description_id = nil
+    assert !@software_database.save, "Database description must be filled" 
+  end
+
+  should "not save if version is empty" do
+    @software_database.version = nil
+    assert !@software_database.save, "Version must be filled" 
+  end
+
+  should "not save if version has more than 20 characters" do
+    @software_database.version = "a"*21
+    assert !@software_database.save, "Version must have until 20 characters" 
+  end
+
+  should "not save if operating system is empty" do
+    @software_database.operating_system = nil
+    assert !@software_database.save, "Operating system must be filled" 
+  end
+  
+  should "not save if operating system has more than 20 characters" do
+    @software_database.operating_system = "a"*21
+    assert !@software_database.save, "Operating system must have until 20 characters" 
+  end
+end
--
libgit2 0.21.2