Add Range function for Steady State detection

Added a range_value function in utilities/math.py able to compute the range
of a series of y values : [y1, y2, ..., yn].
Implemented a test harness for this range_value function in the tests/utilities
section.
Renamed the math_slope.py and math_range.py test files to add _test.py for
Jenkins.
Cleaned up the code so it is compliant to the pep8 rules.

Renamed the previous 'math' modules (storperf/utilities/math.py
and storperf/test/utilities/math.py) as 'math_slope' to be
coherent with the new notation.

Change-Id: I02ccd2b87f0b72e7a28c416b593aae4d8ad97961
JIRA: STORPERF-57
JIRA: STORPERF-58
Signed-off-by: Tim Rault <tim.rault@cengn.ca>

1 files changed, 67 insertions, 0 deletions

diff --git a/storperf/tests/utilities/math_slope_test.py b/storperf/tests/utilities/math_slope_test.py
new file mode 100644
index 0000000..a34845b
--- /dev/null
+++ b/storperf/tests/utilities/math_slope_test.py
@@ -0,0 +1,67 @@
+##############################################################################
+# Copyright (c) 2016 CENGN and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+import unittest
+from storperf.utilities import math as math
+
+
+class MathSlopeTest(unittest.TestCase):
+
+    def setUp(self):
+        unittest.TestCase.setUp(self)
+        pass
+
+    def test_slope_empty_series(self):
+        expected = 0
+        actual = math.slope([])
+        self.assertEqual(expected, actual)
+
+    def test_slope_integer_series(self):
+        expected = 1.4
+        actual = math.slope([[1, 6], [2, 5], [3, 7], [4, 10]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_decimal_series(self):
+        expected = 1.4
+        actual = math.slope([[1.0, 6.0], [2.0, 5.0], [3.0, 7.0], [4.0, 10.0]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_decimal_integer_mix(self):
+        expected = 1.4
+        actual = math.slope([[1.0, 6], [2, 5.0], [3, 7], [4.0, 10]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_negative_y_series(self):
+        expected = 2
+        actual = math.slope([[1.0, -2], [2, 2], [3, 2]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_negative_x_series(self):
+        expected = 1.4
+        actual = math.slope([[-24, 6.0], [-23, 5], [-22, 7.0], [-21, 10]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_out_of_order_series(self):
+        expected = 1.4
+        actual = math.slope([[2, 5.0], [4, 10], [3.0, 7], [1, 6]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_0_in_y(self):
+        expected = -0.5
+        actual = math.slope([[15.5, 1], [16.5, 0], [17.5, 0]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_0_in_x(self):
+        expected = 1.4
+        actual = math.slope([[0, 6.0], [1, 5], [2, 7], [3, 10]])
+        self.assertEqual(expected, actual)
+
+    def test_slope_0_in_x_and_y(self):
+        expected = 1.5
+        actual = math.slope([[0.0, 0], [1, 1], [2, 3]])
+        self.assertEqual(expected, actual)