#!/usr/bin/python

'''Unit tests for cacher_mod'''

import unittest

import dohdbm
import cacher_mod

class test_cacher_mod(unittest.TestCase):
	# pylint: disable=R0904
	# R0904: We're a module inheriting from unittest.TestCase; of course we have lots of public methods
	'''Unit tests for cacher_mod'''

	def test_open_and_close(self):
		'''Test a single file'''
		dummy = self
		cacher = cacher_mod.Cacher(max_entries = 2)
		cacher['a'] = dohdbm.open('a.doh', 'w')
		cacher['a'].close()

	def test_open_value_close(self):
		'''Test a single file with a single value'''
		dummy = self
		cacher = cacher_mod.Cacher(max_entries = 2)
		cacher['a'] = dohdbm.open('a.doh', 'n')
		cacher['a']['key'] = 'value'
		cacher['a'].close()

	def test_2_open_value_close(self):
		'''Test 2 files with values'''
		dummy = self
		cacher = cacher_mod.Cacher(max_entries = 2)
		cacher['a'] = dohdbm.open('a.doh', 'n')
		cacher['b'] = dohdbm.open('b.doh', 'n')
		cacher['a']['key'] = 'value'
		cacher['b']['key2'] = 'value2'
		cacher['a'].close()
		cacher['b'].close()

	def test_3_open_value_close(self):
		'''Test 3 files with values in a cacher that'll only hold 2 - close the remaining two, one at a time'''
		dummy = self
		cacher = cacher_mod.Cacher(max_entries = 2)
		assert len(cacher) == 0, len(cacher)
		cacher['a'] = dohdbm.open('a.doh', 'n')
		assert len(cacher) == 1, len(cacher)
		cacher['b'] = dohdbm.open('b.doh', 'n')
		assert len(cacher) == 2, len(cacher)
		cacher['c'] = dohdbm.open('c.doh', 'n')
		assert len(cacher) == 2, len(cacher)
		try:
			cacher['a']['key'] = 'value'
		except KeyError:
			pass
		else:
			raise AssertionError
		cacher['b']['key2'] = 'value2'
		cacher['c']['key3'] = 'value3'
		cacher['b'].close()
		cacher['c'].close()

	def test_3_open_value_agg_close(self):
		'''Test 3 files with values in a cacher that'll only hold 2 - close en masse'''
		dummy = self
		cacher = cacher_mod.Cacher(max_entries = 2)
		assert len(cacher) == 0, len(cacher)
		cacher['a'] = dohdbm.open('a.doh', 'n')
		assert len(cacher) == 1, len(cacher)
		cacher['b'] = dohdbm.open('b.doh', 'n')
		assert len(cacher) == 2, len(cacher)
		cacher['c'] = dohdbm.open('c.doh', 'n')
		assert len(cacher) == 2, len(cacher)
		try:
			cacher['a']['key'] = 'value'
		except KeyError:
			pass
		else:
			raise AssertionError
		cacher['b']['key2'] = 'value2'
		cacher['c']['key3'] = 'value3'
		cacher.close()

	def test_3_open_part_then_agg_close(self):
		'''3 files, two values, close en masse'''
		dummy = self
		cacher = cacher_mod.Cacher(max_entries = 2)
		assert len(cacher) == 0, len(cacher)
		cacher['a'] = dohdbm.open('a.doh', 'n')
		assert len(cacher) == 1, len(cacher)
		cacher['b'] = dohdbm.open('b.doh', 'n')
		assert len(cacher) == 2, len(cacher)
		cacher['c'] = dohdbm.open('c.doh', 'n')
		assert len(cacher) == 2, len(cacher)
		try:
			cacher['a']['key'] = 'value'
		except KeyError:
			pass
		else:
			raise AssertionError
		cacher['b']['key2'] = 'value2'
		cacher.close()

unittest.main()