updated chapter 4 and appendix-A files

appendix-A/test_schedule1.py

@@ -0,0 +1,37 @@
+import shelve
+import pytest
+
+import schedule1 as schedule
+
+
+@pytest.yield_fixture
+def db():
+    with shelve.open(schedule.DB_NAME) as the_db:
+        if schedule.CONFERENCE not in the_db:
+            schedule.load_db(the_db)
+        yield the_db
+
+
+def test_record_class():
+    rec = schedule.Record(spam=99, eggs=12)
+    assert rec.spam == 99
+    assert rec.eggs == 12
+
+
+def test_conference_record(db):
+    assert schedule.CONFERENCE in db
+
+
+def test_speaker_record(db):
+    speaker = db['speaker.3471']
+    assert speaker.name == 'Anna Martelli Ravenscroft'
+
+
+def test_event_record(db):
+    event = db['event.33950']
+    assert event.name == 'There *Will* Be Bugs'
+
+
+def test_event_venue(db):
+    event = db['event.33950']
+    assert event.venue_serial == 1449