Start making test for altimeter

tests/instruments/altimeter/test_altimeter.py

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+import pytest
+from unittest import mock
+from PyQt5.QtWidgets import QApplication
+from PyQt5.QtCore import Qt, qRound
+from PyQt5.QtGui import QColor, QBrush, QPen, QFont, QPaintEvent, QFontMetrics
+from pyefis.instruments import altimeter
+import pyefis.hmi as hmi
+from tests.utils import track_calls
+
+
+@pytest.fixture
+def app(qtbot):
+    test_app = QApplication.instance()
+    if test_app is None:
+        test_app = QApplication([])
+    return test_app
+
+
+def test_altimeter(fix,qtbot):
+    widget = altimeter.Altimeter()
+    assert widget.getRatio() == 1
+    qtbot.addWidget(widget)
+    assert widget.item.value == 0