def testFindOneMatchingSignificant(self):
"""
One matching and significant subject must be found if the
significanceFraction is sufficiently low.
"""
sequence = 'AFRRRFRRRFASAASA'
subject = AARead('subject', sequence)
query = AARead('query', sequence)
dbParams = DatabaseParameters(landmarks=[AlphaHelix],
trigPoints=[Peaks],
maxDistance=11)
db = Database(dbParams)
db.addSubject(subject)
findParams = FindParameters(significanceFraction=0.0)
result = db.find(query, findParams)
self.assertEqual(
{
'0': [
{
'queryLandmark': Landmark('AlphaHelix', 'A', 1, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 11),
'subjectLandmark': Landmark('AlphaHelix', 'A', 1, 9,
2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 11),
},
],
}, result.matches)
def testFindOneMatchingSignificantWithSubjectIndicesIncludingIt(self):
"""
One matching and significant subject must be found, including when a
non-empty subjectIndices is passed which includes the found index (and
other non-matched subject indices)
"""
sequence = 'AFRRRFRRRFASAASA'
subject = AARead('subject', sequence)
query = AARead('query', sequence)
dbParams = DatabaseParameters(landmarks=[AlphaHelix],
trigPoints=[Peaks],
maxDistance=11)
db = Database(dbParams)
db.addSubject(subject)
findParams = FindParameters(significanceFraction=0.0)
result = db.find(query, findParams, subjectIndices={'0', 'x', 'y'})
self.assertEqual(
{
'0': [
{
'queryLandmark': Landmark('AlphaHelix', 'A', 1, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 11),
'subjectLandmark': Landmark('AlphaHelix', 'A', 1, 9,
2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 11),
},
],
}, result.matches)
def testFindTwoMatchingInSameSubject(self):
"""
Two matching hashes in the subject must be found correctly.
"""
sequence = 'FRRRFRRRFASAASA'
subject = AARead('subject', sequence)
query = AARead('query', sequence)
dbParams = DatabaseParameters(landmarks=[AlphaHelix],
trigPoints=[Peaks])
db = Database(dbParams)
db.addSubject(subject)
result = db.find(query)
self.assertEqual(
{
'0': [{
'queryLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 10),
'subjectLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 10),
}, {
'queryLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 13),
'subjectLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 13),
}]
}, result.matches)
def testFindOneMatchingInsignificant(self):
"""
One matching subject should be found, but is not significant with the
default value of significanceFraction.
"""
subject = AARead('subject', 'AFRRRFRRRFASAASAVVVVVVASAVVVASA')
query = AARead('query', 'FRRRFRRRFASAASAFRRRFRRRFFRRRFRRRFFRRRFRRRF')
dbParams = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks])
db = Database(dbParams)
db.addSubject(subject)
result = db.find(query)
self.assertEqual(
{
'0': [{
'queryLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 10),
'subjectLandmark': Landmark('AlphaHelix', 'A', 1, 9, 2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 11),
}, {
'queryLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 13),
'subjectLandmark': Landmark('AlphaHelix', 'A', 1, 9, 2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 14),
}]
}, result.matches)
self.assertEqual(0, len(list(result.significantSubjects())))
def testFindBug493Minimal(self):
"""
A minimal failing test case for
https://github.com/acorg/light-matter/issues/493
"""
query = SSAARead(
'2HLA:A',
'ALKEDLRSWTAADMAAQTTKHKWEAAHVAEQWRAYLEGTCVEWLRRYLENGKETLQRTDAPK'
'THMTHHAVSDHEATLRCWALSFYPAEITLTWQRDGEDQTQDTELVETRPAGDGTFQKWVAVV',
'EE-TTSS-EEESSHHHHHHHHHHHHTTTHHHHHHHHHTHHHHHHHHHHHHHHHHHT--B--E'
'EEEEEEE-SSSEEEEEEEEEEEBSS-EEEEEEETTEEE-TTEEE---EE-SSS-EEEEEEEE')
subject = SSAARead(
'3D2U:A',
'HVLRYGYTGIFDDTSHMTLTVVGIFDGQHFFTYHVQSSDKASSRANGTISWMANVSAAYPTY'
'PVTHPVVKGGVRNQNDNRAEAFCTSYGFFPGEIQITFIHYGDKVPEDSEPQCNPLLPTLDGT',
'-EEEEEEEEEESSSS-EEEEEEEEETTEEEEEEEEESS-SSS-EEEE-STHHHHHHHHSTTH'
'--B--EEEEEEEEEETTEEEEEEEEEEEBSS--EEEEEEESS---TT---EE---EE-TTS-')
dbParams = DatabaseParameters(landmarks=['PDB ExtendedStrand'],
trigPoints=[],
limitPerLandmark=50,
distanceBase=1.1)
db = Database(dbParams)
_, subjectIndex, _ = db.addSubject(subject)
findParams = FindParameters(significanceFraction=0.01)
result = db.find(query, findParams, storeFullAnalysis=True)
significantBins = result.analysis[subjectIndex]['significantBins']
for binInfo in significantBins:
normalizeBin(binInfo['bin'], len(query))
def testSymmetricFindScoresDifferingSubjectAndQuery(self):
"""
The score of matching a sequence A against a sequence B must
be the same as when matching B against A, including when the number
of hashes in the two differs and the scores are not 1.0.
"""
subject = AARead('subject', 'AFRRRFRRRFASAASAFRRRFRRRF')
query = AARead('query', 'FRRRFRRRFASAVVVVVV')
dbParams1 = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks])
db = Database(dbParams1)
_, index, _ = db.addSubject(subject)
hashCount1 = db.getSubjectByIndex(index).hashCount
findParams = FindParameters(significanceFraction=0.0)
result = db.find(query, findParams)
score1 = result.analysis['0']['bestBinScore']
dbParams2 = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks])
db = Database(dbParams2)
_, index, _ = db.addSubject(query)
hashCount2 = db.getSubjectByIndex(index).hashCount
result = db.find(subject, findParams)
score2 = result.analysis['0']['bestBinScore']
self.assertNotEqual(hashCount1, hashCount2)
self.assertEqual(score1, score2)
self.assertNotEqual(1.0, score1)
def testSymmetricFindScoresSameSubjectAndQuery(self):
"""
The score of matching a sequence A against a sequence B must
be the same as when matching B against A, and that score must
be 1.0 when the subject and the query are identical.
"""
sequence = 'AFRRRFRRRFASAASAFRRRFRRRF'
subject = AARead('subject', sequence)
query = AARead('query', sequence)
dbParams = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks])
db = Database(dbParams)
db.addSubject(subject)
findParams = FindParameters(significanceFraction=0.0)
result = db.find(query, findParams)
score1 = result.analysis['0']['bestBinScore']
dbParams = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks])
db = Database(dbParams)
db.addSubject(query)
result = db.find(subject, findParams)
score2 = result.analysis['0']['bestBinScore']
self.assertEqual(score1, score2)
self.assertEqual(1.0, score1)
def testInitialDatabaseHasNoSubjectInfo(self):
"""
The database must not have any stored subject information if no
subjects have been added.
"""
dbParams = DatabaseParameters()
db = Database(dbParams)
self.assertEqual([], list(db.getSubjects()))
def testInitialStatistics(self):
"""
The database statistics must be initially correct.
"""
dbParams = DatabaseParameters()
db = Database(dbParams)
self.assertEqual(0, db.subjectCount())
self.assertEqual(0, db.totalResidues())
self.assertEqual(0, db.totalCoveredResidues())
def testGetSubjectHashCount(self):
"""
If a subject is added, getSubjectByIndex must return a Subject
instance that has the correct hash count.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
subject = AARead('id', 'FRRRFRRRFAFRRRFRRRF')
_, index, _ = db.addSubject(subject)
self.assertEqual(1, db.getSubjectByIndex(index).hashCount)
def testGetSubjectBySubject(self):
"""
If a subject is added, getIndexBySubject must be able to return it
given an identical subject to look up.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
_, index, _ = db.addSubject(AARead('id', 'FRRRFRRRF'))
self.assertEqual(
index, db.getIndexBySubject(Subject(AARead('id', 'FRRRFRRRF'))))
def testAddSameSubjectReturnsSameIndex(self):
"""
If an identical subject is added multiple times, the same subject
index must be returned.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
self.assertEqual(
db.addSubject(AARead('id', 'FRRRFRRRF'))[1],
db.addSubject(AARead('id', 'FRRRFRRRF'))[1])
def testAddNewBackend(self):
"""
When a new backend is added, the returned parameters must be those of
the database.
"""
dbParams1 = DatabaseParameters(landmarks=[AlphaHelix],
trigPoints=[Peaks])
db = Database(dbParams1)
name, checksum, dbParams2 = db.addBackend()
self.assertIs(dbParams1, dbParams2)
def testGetSubjectByIndex(self):
"""
If a subject is added, getSubjectByIndex must be able to return it
given its string index.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
subject = AARead('id', 'FRRRFRRRF')
_, index, _ = db.addSubject(subject)
self.assertEqual(Subject(AARead('id', 'FRRRFRRRF')),
db.getSubjectByIndex(index))
def testReconnectSameNameBackend(self):
"""
If a backend tries to connect but re-uses an existing backend name,
a BackendException must be raised.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix])
db = Database(dbParams)
name, checksum, dbParams = db.addBackend()
error = "^Backend %r is already connected\.$" % name
six.assertRaisesRegex(self, BackendException, error, db.addBackend,
name)
def testAddSameSubjectReturnsCorrectPreExisting(self):
"""
If an identical subject is added multiple times, the expected
pre-existing values must be returned.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
self.assertEqual([False, True], [
db.addSubject(AARead('id', 'FRRRFRRRF'))[0],
db.addSubject(AARead('id', 'FRRRFRRRF'))[0]
])
def testFindWithOneUnreconnectedBackend(self):
"""
If a database has one unreconnected backend, calling find() must raise
BackendException with the expected error message.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix])
db = Database(dbParams)
db.disconnectedBackends['dummy'] = None
query = AARead('id', 'AAA')
error = "^Backend 'dummy' has not reconnected\.$"
six.assertRaisesRegex(self, BackendException, error, db.find, query)
def testChecksumEmptyDatabase(self):
"""
The database checksum must be the same as the checksum for its
parameters plus the default backend name when no subjects have
been added to the database.
"""
dbParams = DatabaseParameters()
expected = Checksum(dbParams.checksum).update([
Backend.DEFAULT_NAME,
])
db = Database(dbParams)
self.assertEqual(expected.value, db.checksum())
def testFindNoMatching(self):
"""
A non-matching key must not be found.
"""
subject = AARead('subject', 'FRRRFRRRFASAASA')
query = AARead('query', 'FRRR')
dbParams = DatabaseParameters(landmarks=[AlphaHelix],
trigPoints=[Peaks])
db = Database(dbParams)
db.addSubject(subject)
result = db.find(query)
self.assertEqual({}, result.matches)
def testOneReadTwoLandmarksGetSubjects(self):
"""
If one subject with two landmarks (and hence one hash) is added, an
entry is appended to the database subject info.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
db.addSubject(AARead('id', 'FRRRFRRRFAFRRRFRRRF'))
subject = list(db.getSubjects())[0]
read = AARead('id', 'FRRRFRRRFAFRRRFRRRF')
self.assertEqual(Subject(read, 1), subject)
self.assertEqual(1, subject.hashCount)
def testAddSubjects(self):
"""
How long does it take to add SUBJECT_COUNT subjects to a database.
"""
read = AARead('id', self.FEATURE_SEQUENCE * self.FEATURE_COUNT)
dbParams = DatabaseParameters(landmarks=self.LANDMARKS,
trigPoints=self.TRIG_POINTS)
database = Database(dbParams=dbParams)
startTime = time.time()
for _ in range(self.SUBJECT_COUNT):
database.addSubject(read)
elapsed = time.time() - startTime
self.details = elapsed
def testAddSubjectReturnsIndexAndPreExisting(self):
"""
If one subject is added, addSubject must return the index ('0') of the
added subject and a Boolean to indicate whether the subject was already
in the database.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
preExisting, subjectIndex, hashCount = db.addSubject(
AARead('id', 'FRRRFRRRF'))
self.assertFalse(preExisting)
self.assertEqual('0', subjectIndex)
self.assertEqual(0, hashCount)
def testOneReadOneLandmarkGetSubjects(self):
"""
If one subject with just one landmark (and hence no hashes) is added,
an entry is appended to the database subject info.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
db.addSubject(AARead('id', 'FRRRFRRRF'))
subjects = list(db.getSubjects())
self.assertEqual(1, len(subjects))
subject = subjects[0]
self.assertEqual(Subject(AARead('id', 'FRRRFRRRF')), subject)
self.assertEqual(0, subject.hashCount)
def testFindNoneMatchingNoTrigPoint(self):
"""
No matches should be found if there is only one landmark and there are
no trig point finders.
"""
sequence = 'AFRRRFRRRFASAASA'
subject = AARead('subject', sequence)
query = AARead('query', sequence)
dbParams = DatabaseParameters(landmarks=[AlphaHelix], trigPoints=[])
db = Database(dbParams)
db.addSubject(subject)
result = db.find(query)
self.assertEqual({}, result.matches)
def testFindMatchAfterSaveRestore(self):
"""
A matching subject found before a save/restore must also be found
following a database save/restore.
"""
subject = AARead('subject', 'AFRRRFRRRFASAASAVVVVVVASAVVVASA')
query = AARead('query', 'FRRRFRRRFASAASAFRRRFRRRFFRRRFRRRFFRRRFRRRF')
dbParams = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks])
db1 = Database(dbParams)
db1.addSubject(subject)
result = db1.find(query)
expected = {
'0': [{
'queryLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 10),
'subjectLandmark': Landmark('AlphaHelix', 'A', 1, 9, 2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 11),
}, {
'queryLandmark': Landmark('AlphaHelix', 'A', 0, 9, 2),
'queryTrigPoint': TrigPoint('Peaks', 'P', 13),
'subjectLandmark': Landmark('AlphaHelix', 'A', 1, 9, 2),
'subjectTrigPoint': TrigPoint('Peaks', 'P', 14),
}]
}
self.assertEqual(expected, result.matches)
fp = StringIO()
db1.save(fp)
fp.seek(0)
db2 = Database.restore(fp)
result = db2.find(query)
self.assertEqual(expected, result.matches)
def testFindNoneMatchingTooSmallDistance(self):
"""
No matches should be found if the max distance is too small.
"""
sequence = 'AFRRRFRRRFASAASA'
subject = AARead('subject', sequence)
query = AARead('query', sequence)
dbParams = DatabaseParameters(landmarks=[AlphaHelix],
trigPoints=[Peaks],
maxDistance=1)
db = Database(dbParams)
db.addSubject(subject)
result = db.find(query)
self.assertEqual({}, result.matches)
def testPrint(self):
"""
The print_ function should produce the expected output.
"""
self.maxDiff = None
subject = AARead('subject', 'FRRRFRRRFASAASA')
dbParams = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks, Troughs],
limitPerLandmark=16,
maxDistance=10,
minDistance=0,
distanceBase=1,
randomLandmarkDensity=0.6,
randomTrigPointDensity=0.4,
acAlphaHelixFilename='xxx',
acAlphaHelix310Filename='yyy',
acAlphaHelixCombinedFilename='bbb',
acAlphaHelixPiFilename='zzz',
acExtendedStrandFilename='aaa')
db = Database(dbParams)
db.addSubject(subject)
expected = ('Parameters:\n'
' Landmark finders:\n'
' AlphaHelix\n'
' BetaStrand\n'
' Trig point finders:\n'
' Peaks\n'
' Troughs\n'
' Limit per landmark: 16\n'
' Max distance: 10\n'
' Min distance: 0\n'
' Distance base: 1.000000\n'
' Feature length base: 1.350000\n'
' Random landmark density: 0.600000\n'
' Random trig point density: 0.400000\n'
' AC AlphaHelix filename: xxx\n'
' AC AlphaHelix 3-10 filename: yyy\n'
' AC AlphaHelix Combined filename: bbb\n'
' AC AlphaHelix pi filename: zzz\n'
' AC ExtendedStrand filename: aaa\n'
'Connector class: SimpleConnector\n'
'Subject count: 1\n'
'Hash count: 3\n'
'Total residues: 15\n'
'Coverage: 73.33%\n'
'Checksum: 3162290961\n'
'Connector:')
self.assertEqual(expected, db.print_())
def testFindBug493(self):
"""
Failing test case for https://github.com/acorg/light-matter/issues/493
"""
query = SSAARead(
'2HLA:A',
'GSHSMRYFYTSVSRPGRGEPRFIAVGYVDDTQFVRFDSDAASQRMEPRAPWIEQEGPEYWDR'
'NTRNVKAQSQTDRVDLGTLRGYYNQSEAGSHTIQMMYGCDVGSDGRFLRGYRQDAYDGKDYI'
'ALKEDLRSWTAADMAAQTTKHKWEAAHVAEQWRAYLEGTCVEWLRRYLENGKETLQRTDAPK'
'THMTHHAVSDHEATLRCWALSFYPAEITLTWQRDGEDQTQDTELVETRPAGDGTFQKWVAVV'
'VPSGQEQRYTCHVQHEGLPKPL',
'--EEEEEEEEEE--TTSS--EEEEEEEETTEEEEEEETTSTT-S-EE-SHHHHTS-HHHHHH'
'HHHHHHHHHHHHHHHHHHHHHHTT--TTS--EEEEEEEEEE-TTS-EEEEEEEEEETTEEEE'
'EE-TTSS-EEESSHHHHHHHHHHHHTTTHHHHHHHHHTHHHHHHHHHHHHHHHHHT--B--E'
'EEEEEEE-SSSEEEEEEEEEEEBSS-EEEEEEETTEEE-TTEEE---EE-SSS-EEEEEEEE'
'EETT-GGGEEEEEEETTB-S--')
subject = SSAARead(
'3D2U:A',
'HVLRYGYTGIFDDTSHMTLTVVGIFDGQHFFTYHVQSSDKASSRANGTISWMANVSAAYPTY'
'LDGERAKGDLIFNQTEQNLLELEIALGYRSQSVLTWTHECNTTENGSFVAGYEGFGWDGETL'
'MELKDNLTLWTGPNYEISWLKQQKTYIDGKIKNISEGDTTIQRNYLKGNCTQWSVIYSGFQP'
'PVTHPVVKGGVRNQNDNRAEAFCTSYGFFPGEIQITFIHYGDKVPEDSEPQCNPLLPTLDGT'
'FHQGCYVAIFSNQNYTCRVTHGNWTVEIPISVT',
'-EEEEEEEEEESSSS-EEEEEEEEETTEEEEEEEEESS-SSS-EEEE-STHHHHHHHHSTTH'
'HHHHHHHHHHHHHHHHHHHHHHHHHH--SS--EEEEEEEEEE-TT--EEEEEEEEEETTEEE'
'EEE-TTS---B---TTT-GGGGGHHHHHHHHHT--SHHHHHHHHHHHTHHHHHHHHHHHHS-'
'--B--EEEEEEEEEETTEEEEEEEEEEEBSS--EEEEEEESS---TT---EE---EE-TTS-'
'EEEEEEEEEETTSEEEEEEE-SS-EEEEEEE--')
dbParams = DatabaseParameters(landmarks=[
'PDB AlphaHelix', 'PDB AlphaHelix_3_10', 'PDB AlphaHelix_pi',
'PDB ExtendedStrand', 'AminoAcidsLm'
],
trigPoints=[
'AminoAcids', 'Peaks', 'Troughs',
'IndividualPeaks',
'IndividualTroughs'
],
featureLengthBase=1.01,
maxDistance=10000,
limitPerLandmark=50,
distanceBase=1.1)
db = Database(dbParams)
_, subjectIndex, _ = db.addSubject(subject)
findParams = FindParameters(significanceFraction=0.01)
result = db.find(query, findParams, storeFullAnalysis=True)
significantBins = result.analysis[subjectIndex]['significantBins']
for binInfo in significantBins:
normalizeBin(binInfo['bin'], len(query))
def testSaveRestoreEmpty(self):
"""
When asked to save and then restore an empty database, the correct
database must result.
"""
dbParams = DatabaseParameters(landmarks=[AlphaHelix],
trigPoints=[Peaks])
db = Database(dbParams)
fp = StringIO()
db.save(fp)
fp.seek(0)
result = db.restore(fp)
self.assertEqual(0, result.subjectCount())
self.assertEqual(0, result.totalCoveredResidues())
self.assertEqual(0, result.totalResidues())
self.assertIs(None, dbParams.compare(result.dbParams))
def testPrintNoHashes(self):
"""
The print_ function should report the expected result if no hashes are
found in the subject.
"""
self.maxDiff = None
subject = AARead('subject', '')
dbParams = DatabaseParameters(landmarks=[AlphaHelix, BetaStrand],
trigPoints=[Peaks, Troughs],
limitPerLandmark=16,
maxDistance=10,
minDistance=0,
distanceBase=1)
db = Database(dbParams)
db.addSubject(subject)
expected = (
'Parameters:\n'
' Landmark finders:\n'
' AlphaHelix\n'
' BetaStrand\n'
' Trig point finders:\n'
' Peaks\n'
' Troughs\n'
' Limit per landmark: 16\n'
' Max distance: 10\n'
' Min distance: 0\n'
' Distance base: 1.000000\n'
' Feature length base: 1.350000\n'
' Random landmark density: 0.100000\n'
' Random trig point density: 0.100000\n'
' AC AlphaHelix filename: ac-alpha-helix-substrings-20-0.85\n'
' AC AlphaHelix 3-10 filename: ac-alpha-helix-3-10-substrings-'
'1-0.5\n'
' AC AlphaHelix Combined filename: ac-alpha-helix-combined-'
'substrings-20-0.85\n'
' AC AlphaHelix pi filename: ac-alpha-helix-pi-substrings-1-0.5\n'
' AC ExtendedStrand filename: ac-extended-strand-substrings-'
'10-0.5\n'
'Connector class: SimpleConnector\n'
'Subject count: 1\n'
'Hash count: 0\n'
'Total residues: 0\n'
'Coverage: 0.00%\n'
'Checksum: 3786852290\n'
'Connector:')
self.assertEqual(expected, db.print_())
