Create unit tests for pilot class.

DCS Liberation does not have much unit tests. Pilot class is not very
exiting but it was a good place to start.

tests/test_pilot.py

@@ -0,0 +1,64 @@
+import pytest
+
+from faker import Faker
+from game.squadrons.pilot import Pilot, PilotStatus
+
+
+@pytest.fixture(scope="function")
+def pilot() -> Pilot:
+    return Pilot("John Doe")
+
+
+def test_pilot_creation() -> None:
+    new_pilot = Pilot("John Doe")
+    assert new_pilot.name == "John Doe"
+    assert new_pilot.status == PilotStatus.Active
+
+
+def test_pilot_active(pilot: Pilot) -> None:
+    assert pilot.status == PilotStatus.Active
+
+
+def test_pilot_alive(pilot: Pilot) -> None:
+    assert pilot.alive == True
+
+
+def test_pilot_on_leave(pilot: Pilot) -> None:
+    pilot.send_on_leave()
+    assert pilot.status == PilotStatus.OnLeave
+    assert pilot.on_leave == True
+    pilot.return_from_leave()
+    assert pilot.status == PilotStatus.Active
+    assert pilot.on_leave == False
+
+
+def test_pilot_on_leave_twice(pilot: Pilot) -> None:
+    pilot.send_on_leave()
+    assert pilot.status == PilotStatus.OnLeave
+    with pytest.raises(RuntimeError):
+        pilot.send_on_leave()
+
+
+def test_pilot_not_on_leave(pilot: Pilot) -> None:
+    with pytest.raises(RuntimeError):
+        pilot.return_from_leave()
+
+
+def test_pilot_dead(pilot: Pilot) -> None:
+    pilot.kill()
+    assert pilot.status == PilotStatus.Dead
+
+
+def test_pilot_record(pilot: Pilot) -> None:
+    pilot.record.missions_flown == 0
+
+
+def test_missions_flown(pilot: Pilot) -> None:
+    pilot.record.missions_flown = 1
+    assert pilot.record.missions_flown == 1
+
+
+def test_random_pilot_name() -> None:
+    faker = Faker()
+    random_pilot = Pilot.random(faker)
+    assert random_pilot.name