Adds the first test (for humantime)

tests/test_utils.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+from tableprint import humantime
+import pytest
+
+
+def test_humantime():
+
+    # test numeric input
+    assert humantime(1e6) == u'1 weeks, 4 days, 13 hours, 46 min., 40 s'
+    assert humantime(2e5) == u'2 days, 7 hours, 33 min., 20 s'
+    assert humantime(5e3) == u'1 hours, 23 min., 20 s'
+    assert humantime(60) == u'1 min., 0 s'
+    assert humantime(1) == u'1 s'
+    assert humantime(0) == u'0 s'
+    assert humantime(0.1) == u'100 ms'
+    assert humantime(0.005) == u'5 ms'
+    assert humantime(1e-5) == u'10 μs'
+    assert humantime(5.25e-4) == u'525 μs'
+    assert humantime(5e-7) == u'500 ns'
+    assert humantime(1e-12) == u'0.001 ns'
+
+    # test non-numeric input
+    for val in ('abc', [], {'x': 5}):
+
+        with pytest.raises(ValueError) as context:
+            humantime(val)
+
+        assert 'Input must be numeric' in str(context.value)