Start adding some tests

Improve the fixed_version function
Better binary search parameter return values

tests/__init__.py

@@ -0,0 +1 @@
+__author__ = 'david'

tests/utils_test.py

@@ -0,0 +1,23 @@
+import unittest
+
+from zttf.utils import fixed_version, binary_search_parameters
+
+
+class TestUtils(unittest.TestCase):
+    def test_fixed_version(self):
+        cases = [
+            (0x00005000, 0.5),
+            (0x00010000, 1.0),
+            (0x00035000, 3.5),
+            (0x00105000, 10.5)
+        ]
+        for case in cases:
+            self.assertEqual(fixed_version(case[0]), case[1])
+
+    def test_binary_parameters(self):
+        cases = {
+            39: (5, 64, 14),
+            10: (3, 16, 4)
+        }
+        for n, result in cases.items():
+            self.assertEqual(binary_search_parameters(n), result)