add unique id ending function and get full id function

and write ascii data file function

tests/test_data.py

@@ -1,6 +1,6 @@
 """Test of data module.
 
-:Date: 2019-06-12
+:Date: 2019-07-29
 
 .. module:: test_data
   :platform: *nix, Windows
@@ -13,19 +13,44 @@ import unittest
 import os
 import sys
 sys.path.insert(0, os.path.abspath('../src'))
-from data import data_read
+from data import read, unique_ending, get_id
 
 
-class TestFit(unittest.TestCase):
+class TestData(unittest.TestCase):
+  file_name = "test_fit.dat"
+  ids = [
+    '2f7a762d-98e2-4f4a-ac0d-188b8625fb64',
+    'ec54948d-76d4-4717-81cd-db7a15f750cf',
+    '837c5378-9e6e-4bd0-b6a7-460d02fb62a3',
+    'efa51a89-4dc5-4e96-8c8c-4f0c6461dafa',
+    'c04e5303-4ba0-4ff5-acd8-197680b27bda',
+    '2994791a-b2e1-47f5-bdbc-3050cf249808',
+    'fc12b455-a574-4361-a8cc-1a430e18dfa8',
+    '560b34bb-74e7-463e-94da-be3f5e393f13',
+    'ba2bdca8-fd2c-48a9-b9b0-3734f33ebe94',
+  ]
 
   def test_read(self):
     """test read function"""
-    file_name = "test_fit.dat"
-    x, y = data_read(file_name, 3, 2)
+    x, y = read(self.file_name, 3, 2)
 
     self.assertEqual(len(x), 1027)
     self.assertEqual(len(y), 1027)
 
+  def test_unique_ending(self):
+    """test unique_ending function"""
+    self.assertEqual(
+      unique_ending(self.ids),
+      ['64', 'cf', 'a3', 'fa', 'da', '08', 'a8', '13', '94']
+    )
+
+  def test_get_id(self):
+    """test get_id function"""
+    self.assertEqual(
+      get_id(self.ids, 'a3'),
+      '837c5378-9e6e-4bd0-b6a7-460d02fb62a3'
+    )
+
 
 if __name__ == '__main__':
   unittest.main()