from unittest.case import TestCase
from tudelft.utilities.tools.dictkeys import Keys
from collections.abc import Set


class dictKeysTest(TestCase):
    def testSimple(self):
        d={'a':1,'b':2}
        keys=Keys(d)
        self.assertTrue(isinstance(keys,Set))
        self.assertEquals(2, len(keys))
        self.assertTrue('a' in keys)
        self.assertFalse('d' in keys)
        #self.assertFalse(d in keys)
        
        self.assertEquals(None, keys.pop('d'))
        self.assertEquals(1, keys.pop('a'))
        self.assertEquals(1, len(d))
        
        
    def testFrozen(self):
        d={'a':1,'b':2}
        keys=Keys(d)
        print(frozenset(keys))
        self.assertEqual(2, len(frozenset(keys)))
        
    def test_difference_update(self):
        d={'a':1,'b':2,'c':3}
        keys=Keys(d)
        keys.difference_update(set(['a','b']))
        self.assertEquals(set(['c']), keys)
        
    def test_issuperset(self):
        self.assertTrue(Keys({0:'a',1:'b',2:'c'}).issuperset(Keys({1:'x'})))
        self.assertTrue(Keys({0:'a',1:'b',2:'c'}).issuperset(Keys({0:'w',1:'x'})))
        self.assertFalse(Keys({0:'a',1:'b',2:'c'}).issuperset(Keys({2:'x',3:'y'})))
        self.assertTrue(Keys({0:'a',1:'b',2:'c'}).issuperset(Keys({})))
        
    def test_equals(self):
        d1={'a':1,'b':2}
        keys1=Keys(d1)
        d2={'a':1,'b':2}
        keys2=Keys(d2)
        self.assertTrue(keys2<=keys1)
        self.assertTrue(keys1<=keys2)
        self.assertTrue(keys1==keys2)
        
        d3={'a':1}
        keys3=Keys(d3)
        self.assertTrue(keys3<=keys1)
        self.assertFalse(keys1<=keys3)
        self.assertFalse(keys3==keys1)