def test_get_placeholders_empty_string(self):
# Verify an empty string has no placeholders
content = ''
m = Message(content=content,
schedule='',
start_date='',
start_time='',
title='')
assert len(m.get_placeholders()) == 0
def test_get_placeholders_valid_template_string(self):
# Verify a valid template string has placeholders
# https://docs.python.org/3/library/string.html#template-strings
content = 'Test ${template} string'
m = Message(content=content,
schedule='',
start_date='',
start_time='',
title='')
assert len(m.get_placeholders()) == 1