Merge branch 'merge' into upstream-master

* merge:
  Add one more name to Contributors.
  adjust whitespace, add multiple value tests
  add Vector2.truncate unit tests
  added tests for scale method
  add test for vector normalize
  Create test_vector2_equality.py
  Updated test using pytest
  Create test_vector2_truncate.py

Closes #13
Closes #14
Closes #15
Closes #16

CONTRIBUTORS.md

@@ -14,10 +14,13 @@ Thank you everyone below for your contributions **(No matter how big or small)!*
 
 | Name | Email | Twitter |
 | ---- | ----- | ------- |
-| [Amber Phair](https://github.com/Maowse) |
-| [Jeronimo Martinez Sanchez](https://github.com/jms) |
-| [AJ Khan](https://github.com/ak9999) |
-| [Rodrigo Prado](https://github.com/royopa) |
-| [Jamie Bliss](https://github.com/astronouth7303) |
-| [Devesh Kailay](https://github.com/deveshd2k) |
-| [Vitaly Khabarov](https://github.com/vitkhab) |
+| [Amber Phair](https://github.com/Maowse) |||
+| [Jeronimo Martinez Sanchez](https://github.com/jms) |||
+| [AJ Khan](https://github.com/ak9999) |||
+| [Rodrigo Prado](https://github.com/royopa) |||
+| [Jamie Bliss](https://github.com/astronouth7303) |||
+| [Devesh Kailay](https://github.com/deveshd2k) |||
+| [Vitaly Khabarov](https://github.com/vitkhab) |||
+| [Ricky Putra](kurokochin) |||
+| [Maybeking](https://github.com/Maybeking) |||
+| [Henry](https://github.com/hphu) |||

tests/test_vector2_equality.py

@@ -0,0 +1,13 @@
+import ppb_vector
+
+def test_equal():
+  test_vector_1 = ppb_vector.Vector2(50, 800)
+  test_vector_2 = ppb_vector.Vector2(50, 800)
+
+  assert test_vector_1 == test_vector_2
+
+def test_not_equal():
+  test_vector_1 = ppb_vector.Vector2(800, 800)
+  test_vector_2 = ppb_vector.Vector2(50, 800)
+
+  assert test_vector_1 != test_vector_2

tests/test_vector2_normalize.py

@@ -0,0 +1,15 @@
+import pytest
+
+import ppb_vector
+
+
+@pytest.mark.parametrize("x, y, expected", [
+    (3, 4, 1),
+    (6, 8, 1),
+    (0, 1, 1),
+    (1, 0, 1),
+    (0, 0, 0)
+])
+def test_normalize(x, y, expected):
+    vector = ppb_vector.Vector2(x, y).normalize()
+    assert vector.length == expected

tests/test_vector2_scale.py

@@ -0,0 +1,27 @@
+import pytest
+from math import hypot
+
+from ppb_vector import Vector2
+
+
+@pytest.fixture()
+def vector():
+    return Vector2(10, 20)
+
+
+def test_calculate_scale(vector):
+    x, y = 10, 20
+    length = hypot(x, y)
+    scale = 4
+    vector_scale_calculated = vector * (scale / length)
+    assert vector.scale(scale) == vector_scale_calculated
+
+
+def test_scale_is_equivalent_to_truncate():
+    """ 
+    Vector2.scale is equivalent to Vector2.truncate 
+    when scalar is less than length
+    """
+    vector_scale = Vector2(3, 4).scale(4)
+    vector_truncate = Vector2(3, 4).truncate(4)
+    assert vector_scale == vector_truncate

tests/test_vector2_truncate.py

@@ -0,0 +1,45 @@
+import pytest
+
+from ppb_vector import Vector2
+
+
+def test_truncate():
+    test_vector = Vector2(700, 500)
+    test_vector_truncated = test_vector.truncate(5)
+    print(test_vector_truncated)
+    assert test_vector_truncated == Vector2(4.068667356033675, 2.906190968595482)
+
+
+def test_truncate_larger_max_length():
+    vector = Vector2(3, 5)
+    truncated = vector.truncate(10)
+    assert vector == truncated
+
+
+def test_truncate_equal_max_length():
+    vector = Vector2(3, 4)
+    truncated = vector.truncate(5)
+    assert vector == truncated
+
+
+def test_truncate_lesser_max_length():
+    vector = Vector2(20, 30)
+    truncated = vector.truncate(10)
+    assert truncated == vector.scale(10)
+
+
+data = [
+    ([Vector2(1, 2), 3], Vector2(1, 2)),
+    ([Vector2(5, 12), 6], Vector2(5, 12).scale(6)),
+    ([Vector2(92, 19), 61], Vector2(92, 19).scale(61)),
+    ([Vector2(22, 5), 41], Vector2(22, 5)),
+    ([Vector2(2212481, 189898), 129039], Vector2(2212481, 189898).scale(129039)),
+    ([Vector2(5, 12), 13], Vector2(5, 12)),
+    ([Vector2(438, 153), 464], Vector2(438, 153)),
+    ([Vector2(155, 155), 155], Vector2(155, 155).scale(155))
+]
+
+
+@pytest.mark.parametrize('test_input, expected', data)
+def test_multiples_values(test_input, expected):
+    assert test_input[0].truncate(test_input[1]) == expected