added VERY simple test for fields.py

test/test_fields.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python2
+
+import unittest
+import postpic.analyzer as pa
+import postpic.datareader as da
+import numpy as np
+
+class TestFieldAnalyzer(unittest.TestCase):
+
+    def setUp(self):
+        da.chooseCode('dummy')
+        self.dr = da.readDump(10000)
+        self.fa = pa.FieldAnalyzer(self.dr)
+
+    def test_fa(self):
+        emfield = self.fa.energydensityEM()
+        self.assertEqual(emfield.name, 'Energy Density EM-Field')
+
+if __name__ == '__main__':
+    unittest.main()