add test for placement_controller

Author: levibyte

tests/placement_controller_test.py

@@ -0,0 +1,77 @@
+import pytest
+
+from libs.placement_controller import PlacementController
+from libs.node import Node, Color
+
+
+@pytest.fixture
+def placement_data():
+    """ creates simple placement data
+    Placement bellow:
+    
+      A    D  
+       \  /   
+      B-\/-E   
+        /\   
+       /  \   
+      C    F
+    
+    Total there are 3 intersection within this placement.
+    """
+
+    layers = []
+    layer1 = []
+    layer2 = []
+    
+    dummy_color = Color(0,0,0)
+    A = Node("A",dummy_color)
+    B = Node("B",dummy_color)
+    C = Node("C",dummy_color)
+    D = Node("D",dummy_color)
+    E = Node("E",dummy_color)
+    F = Node("F",dummy_color)
+    
+    A.add_connection(F)
+    B.add_connection(E)
+    C.add_connection(D)
+    
+
+    layer1.append(A)
+    layer1.append(B)
+    layer1.append(C)
+    
+    layer2.append(D)
+    layer2.append(E)
+    layer2.append(F)
+    
+    
+    layers.append(layer1)
+    layers.append(layer2)
+    
+    return layers
+    
+def test_count_intersections_raw(placement_data):
+    pc = PlacementController();
+    pc.set_data(placement_data)
+    assert 3 == pc.calc_intersections()
+    
+def test_count_intersections_on_swap_colmns(placement_data):
+    pc = PlacementController();
+    placement_data[0],placement_data[1] = placement_data[1],placement_data[0]
+    pc.set_data(placement_data)
+    assert 0 == pc.calc_intersections()
+    
+def test_count_intersections_on_swap_inside_first_column(placement_data):
+    pc = PlacementController();
+    placement_data[0][0],placement_data[0][2] = placement_data[0][2],placement_data[0][0]
+    pc.set_data(placement_data)
+    assert 0 == pc.calc_intersections()
+
+def test_count_intersections_on_swap_inside_second_column(placement_data):
+    pc = PlacementController();
+    placement_data[1][0],placement_data[1][1] = placement_data[1][1],placement_data[1][0]
+    pc.set_data(placement_data)
+    assert 2 == pc.calc_intersections()
+
+    
+