fix tags and fix tests

test/unit/tag_test.rb

@@ -4,7 +4,26 @@ class TagTest < Test::Rails::TestCase
   fixtures :tags
 
   # Replace this with your real tests.
-  def test_truth
-    assert true
+  def test_find_or_create_with_single_word
+    tag = Tag.find_or_create_by_name("test")
+    assert !tag.new_record?
+  end
+
+  def test_find_or_create_with_space
+    tag = Tag.find_or_create_by_name("test test")
+    assert !tag.new_record?
+  end
+
+  def test_find_or_create_with_dot
+    tag = Tag.find_or_create_by_name("a.b.c")
+    assert !tag.new_record?
+  end
+
+  def test_find_or_create_with_number_as_string
+    tag = Tag.find_or_create_by_name("12343")
+    assert !tag.new_record?
+
+    tag = Tag.find_or_create_by_name("8.1.2")
+    assert !tag.new_record?
   end
 end