Add typing & tests for Layer

tests/TestLayer.py

@@ -0,0 +1,39 @@
+from cura.Layer import Layer
+from unittest.mock import MagicMock
+
+
+def test_lineMeshVertexCount():
+    layer = Layer(1)
+    layer_polygon = MagicMock()
+    layer_polygon.lineMeshVertexCount = MagicMock(return_value = 9001)
+    layer.polygons.append(layer_polygon)
+    assert layer.lineMeshVertexCount() == 9001
+
+
+def test_lineMeshElementCount():
+    layer = Layer(1)
+    layer_polygon = MagicMock()
+    layer_polygon.lineMeshElementCount = MagicMock(return_value = 9001)
+    layer.polygons.append(layer_polygon)
+    assert layer.lineMeshElementCount() == 9001
+
+
+def test_getAndSet():
+    layer = Layer(0)
+
+    layer.setThickness(12)
+    assert layer.thickness == 12
+
+    layer.setHeight(0.1)
+    assert layer.height == 0.1
+
+
+def test_elementCount():
+    layer = Layer(1)
+    layer_polygon = MagicMock()
+    layer_polygon.lineMeshElementCount = MagicMock(return_value=9002)
+    layer_polygon.lineMeshVertexCount = MagicMock(return_value=9001)
+    layer_polygon.elementCount = 12
+    layer.polygons.append(layer_polygon)
+    assert layer.build(0, 0, [], [], [], [], [] ,[] , []) == (9001, 9002)
+    assert layer.elementCount == 12