def test_db_setup_reset(self):
"""Connect to an existing database, but start content from scratch"""
setup_db(dbfile, tables=[DBTableExample], reset=True)
kvtab = DBTableExample(dbfile)
kvtab.add("one", 1)
kvtab.save()
setup_db(dbfile, tables=[DBTableExample], reset=True)
self.assertEqual(kvtab.count_rows(), 0)
def test_db_setup_noreset(self):
"""Connect to an existing database, without resetting content"""
# create a database with a table
setup_db(dbfile, tables=[DBTableExample], reset=True)
kvtab = DBTableExample(dbfile)
kvtab.add("one", 1)
kvtab.save()
setup_db(dbfile, tables=[DBTableExample])
self.assertEqual(kvtab.count_rows(), 1)
class DBTableTests(unittest.TestCase):
"""Test cases for class DBTable."""
def setUp(self):
"""For setup, ensure db does not exist."""
setup_db(dbfile, tables=[DBTableExample])
self.kvtab = DBTableExample(dbfile)
def tearDown(self):
"""At end, ensure test db is deleted."""
remove_if_exists(dbfile)
def test_db_bad_schema_1(self):
"""Catch errors when creating tables with bad schemas."""
class DBTableNoName(DBTable):
"""An example subclass of DBTable that is not valid."""
text_fields = ["key"]
real_fields = ["value"]
with self.assertRaises(Exception) as e:
instance = DBTableNoName(dbfile)
def test_db_bad_schema_2(self):
"""Catch errors when creating tables with bad schemas."""
class DBTableNoFields(DBTable):
"""An example subclass of DBTable that is not valid."""
name = "bad_table"
with self.assertRaises(Exception) as e:
instance = DBTableNoFields(dbfile)
def test_db_bad_dbpath(self):
"""Catch errors when creating tables from bad db paths."""
with self.assertRaises(Exception) as e:
instance = DBTableExample(dbfile + "bad")
def test_table_addone(self):
"""Can add record into table"""
self.kvtab.add("one", 4)
self.kvtab.save(True)
self.assertGreater(self.kvtab.count_rows(), 0,
"should have at least one row after add")
def test_table_empty(self):
"""Can add file"""
self.kvtab.add("one", 4)
self.kvtab.save(True)
self.assertGreater(self.kvtab.count_rows(), 0,
"should have at least one record after save")
self.kvtab.empty()
self.assertEqual(self.kvtab.count_rows(), 0,
"should have nothing after empty")
def test_table_unique(self):
"""Can quickly identify all values in a field"""
self.kvtab.add("one", 4)
self.kvtab.add("two", 4)
self.kvtab.add("two", 5)
self.kvtab.save(True)
self.assertEqual(self.kvtab.count_rows(), 3)
result = self.kvtab.unique("key")
self.assertEqual(set(result), set(["one", "two"]))
def test_table_avoidsave(self):
"""Avoid doing work in save if nothing has been staged"""
self.kvtab.empty()
self.kvtab.add("one", 4)
self.kvtab.save(True)
self.assertEqual(self.kvtab.count_rows(), 1,
"should have nothing after empty")
## next save without add should do nothing
self.kvtab.save(True)
self.assertEqual(self.kvtab.count_rows(), 1,
"should have nothing after empty")
def test_table_addwait(self):
"""Can defer sending data to db in save() command"""
self.kvtab.empty()
self.kvtab.add("one", 4)
self.kvtab.save(False)
self.assertEqual(self.kvtab.count_rows(), 0,
"should have nothing because save is delayed")
self.kvtab.save(True)
self.assertEqual(self.kvtab.count_rows(), 1,
"should have one because save is forced")
def test_table_content(self):
"""Can extract content as a string"""
self.kvtab.empty()
self.kvtab.add("one", 4)
self.kvtab.save(True)
content = self.kvtab.content()
self.assertTrue("one" in content,
"output string should contain inserted row")
def test_table_update(self):
"""can change existing rows"""
self.kvtab.add("A", 4)
self.kvtab.add("B", 5)
self.kvtab.save()
self.kvtab.update(dict(value=10), dict(key="A"))
content = self.kvtab.content()
self.assertTrue("10" in content)
def test_table_update_raises(self):
"""update checks for field names"""
self.kvtab.add("A", 4)
self.kvtab.add("B", 5)
self.kvtab.save()
with self.assertRaises(Exception) as e1:
self.kvtab.update(dict(val=10), dict(key="A"))
with self.assertRaises(Exception) as e2:
self.kvtab.update(dict(value=10), dict(k="A"))
def test_table_delete_raises(self):
"""delete check field names"""
self.kvtab.add("A", 4)
self.kvtab.save()
# this should raise because 'val' is not a column name
with self.assertRaises(Exception) as e0:
self.kvtab.delete("val", ["A"])
def test_table_delete(self):
"""can change existing rows"""
self.kvtab.add("A", 4)
self.kvtab.add("B", 5)
self.kvtab.add("C", 5)
self.kvtab.add("D", 10)
self.kvtab.save()
# delete two rows (one id is irrelevant)
self.kvtab.delete("key", ["A", "C", "ZZZ"])
self.assertEqual(self.kvtab.count_rows(), 2)
# check content of the table
content = self.kvtab.content()
self.assertFalse("A" in content)
self.assertTrue("B" in content)
self.assertFalse("C" in content)
self.assertTrue("D" in content)