Add a few tests for lesson start/end times

Author: encukou

test_naucse/fixtures/test_content/courses/normal-course/info.yml

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+title: A plain vanilla course
+
+plan:
+- title: A normal lesson
+  slug: normal-lesson

test_naucse/fixtures/test_content/runs/2000/run-with-times/info.yml

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+title: Test run with scheduled times
+default_time:
+  start: '19:00'
+  end: '21:00'
+
+plan:
+- title: A normal lesson
+  slug: normal-lesson
+  date: 2000-01-01

test_naucse/fixtures/test_content/runs/2000/run-without-times/info.yml

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+title: Test run without scheduled times
+
+plan:
+- title: A normal lesson
+  slug: normal-lesson
+  date: 2000-01-01

test_naucse/test_session_times.py

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+import datetime
+from pathlib import Path
+
+import pytest
+import dateutil
+
+from naucse import models
+
+
+TZINFO = dateutil.tz.gettz('Europe/Prague')
+
+@pytest.fixture
+def model():
+    path = Path(__file__).parent / 'fixtures/test_content'
+    return models.Root(path)
+
+
+def test_run_with_times(model):
+    run = model.runs[2000, 'run-with-times']
+    assert run.default_start_time == datetime.time(19, 00, tzinfo=TZINFO)
+    assert run.default_end_time == datetime.time(21, 00, tzinfo=TZINFO)
+
+    lesson = run.sessions['normal-lesson']
+    assert lesson.date == datetime.date(2000, 1, 1)
+    assert lesson.start_time == datetime.datetime(2000, 1, 1, 19, 00,
+                                                  tzinfo=TZINFO)
+    assert lesson.end_time == datetime.datetime(2000, 1, 1, 21, 00,
+                                                tzinfo=TZINFO)
+
+
+def test_run_without_times(model):
+    run = model.runs[2000, 'run-without-times']
+    assert run.default_start_time is None
+    assert run.default_end_time is None
+
+    lesson = run.sessions['normal-lesson']
+    assert lesson.date == datetime.date(2000, 1, 1)
+    assert lesson.start_time is None
+    assert lesson.end_time is None
+
+
+def test_course(model):
+    course = model.courses['normal-course']
+    assert course.default_start_time is None
+    assert course.default_end_time is None
+
+    lesson = course.sessions['normal-lesson']
+    assert lesson.date is None
+    assert lesson.start_time is None
+    assert lesson.end_time is None