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test.py
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test.py
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import unittest
from spc import *
class TestSuite(unittest.TestCase):
def setUp(self):
self.People = Table("People", [ \
("John","1995","musucian"),\
("Steward","1996","poker player"),\
("Jessie","1996","cashier")])
self.Groups = Table("Groups", [ \
("P3","John"), \
("P5","Steward"), \
("P3","Jessie"), \
("P5","Other Dude"), \
("P5","Dudette")])
def testPrintProj(self):
query = PI([1,2], self.People)
self.assertEqual(str(query), "π1,2(People)")
def testPrintCartesian(self):
query = Cartesian(self.People, self.People)
self.assertEqual(str(query), "People x People")
def testPrintCartesianCombined(self):
query = Cartesian(self.People, PI([1,2], self.People))
self.assertEqual(str(query), "People x π1,2(People)")
def testTrivialSigma1(self):
query = Sigma(1,"John", self.People)
result = query.execute()
self.assertEqual(len(result.content), 1)
def testTrivialSigma2(self):
query = Sigma("John","John", self.People)
result = query.execute()
self.assertEqual(len(result.content), 3)
def testTrivialProj(self):
query = PI([1,2], self.People)
result = query.execute()
self.assertEqual(result.content, set([ \
("John","1995"),\
("Steward","1996"),\
("Jessie","1996")]))
def testBooleanProj(self):
query = PI([0], self.People)
result = query.execute()
self.assertEqual(result.content, set([()]))
def testTrivialCartesian(self):
query = Cartesian(self.People, self.People)
self.assertEqual(len(query.execute().content), 9)
def testComplexQuery(self):
query = PI([1],Sigma("P3",4,Sigma(1,5,Cartesian(self.People, self.Groups))))
result = query.execute()
self.assertEqual(query.execute().content, set([("John",),("Jessie",)]))
def testParsingProj(self):
query = "π2,3(People)"
self.assertEqual(query,str(ParsedQuery(query, [self.People, self.Groups])))
def testParsingSigma(self):
query = "σ2=3(People)"
self.assertEqual(query,str(ParsedQuery(query, [self.People, self.Groups])))
def testParsingCartesian(self):
query = "People x Groups x Groups"
self.assertEqual(query,str(ParsedQuery(query, [self.People, self.Groups])))
def testParsingNested(self):
query = "σ2=3(π2,3(People x People))"
self.assertEqual(query,str(ParsedQuery(query, [self.People, self.Groups])))
def testComplexParsedQuery(self):
query = 'π1(σ"P3"=4(σ1=5(People x Groups)))'
self.assertEqual(query,str(ParsedQuery(query, [self.People, self.Groups])))
def testComplexParsedQueryEvaluated(self):
query = 'π1(σ"P3"=4(σ1=5(People x Groups)))'
parsedQuery = ParsedQuery(query, [self.People, self.Groups])
self.assertEqual(parsedQuery.execute().content, set([("John",),("Jessie",)]))
def testReadDatabaseFile(self):
db = DatabaseFile("example.txt")
self.assertEqual(len(db), 4)
def testCaseComplete(self):
db = DatabaseFile("example.txt")
query = ParsedQuery('π1(σ5="Hamburg"(σ1=4(People x Living)))', db)
self.assertEqual((query.execute().content), set([('Alfred',), ('TomRiddle01',)]))
def testUnion(self):
db = DatabaseFile("example.txt")
query = "People ∪ OtherPeople"
parsedQuery = ParsedQuery(query, db)
result = parsedQuery.execute()
# two people are the same in both tables, thus 4+4-2
self.assertEqual(6, len(result.content))
def testComplement(self):
db = DatabaseFile("example.txt")
query = "People \ OtherPeople"
parsedQuery = ParsedQuery(query, db)
result = parsedQuery.execute()
# two people are the same in both tables, thus 4-2
self.assertEqual(2, len(result.content))