def test_display_name_invalid():
"""Tests valid values of display_name."""
# Arrange
app = App()
# Act/Assert
with pytest.raises(ValueError):
app.display_name = ""
with pytest.raises(ValueError):
app.display_name = None
with pytest.raises(ValueError):
app.display_name = "x" * 76
def test_display_name():
"""Tests get/set of display_name."""
# Arrange
app = App()
# Act
expected = "My Display Name"
app.display_name = expected
actual = app.display_name
# Assert
assert expected == actual
