##############################################################################
# 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)