Coverage for tests/test_chain.py: 24%

39 statements  

« prev     ^ index     » next       coverage.py v6.5.0, created at 2023-01-07 10:05 +0000

1# This file is part of daf_relation. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (http://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

8# 

9# This program is free software: you can redistribute it and/or modify 

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <http://www.gnu.org/licenses/>. 

21 

22from __future__ import annotations 

23 

24import unittest 

25 

26from lsst.daf.relation import BinaryOperationRelation, Chain, ColumnError, EngineError, iteration, tests 

27 

28 

29class ChainTestCase(tests.RelationTestCase): 

30 """Tests for the Chain operation and relations based on it.""" 

31 

32 def setUp(self) -> None: 

33 self.a = tests.ColumnTag("a") 

34 self.b = tests.ColumnTag("b") 

35 self.engine = iteration.Engine(name="preferred") 

36 self.leaf_1 = self.engine.make_leaf( 

37 {self.a, self.b}, 

38 payload=iteration.RowSequence([{self.a: 0, self.b: 5}, {self.a: 1, self.b: 10}]), 

39 name="leaf_1", 

40 ) 

41 self.leaf_2 = self.engine.make_leaf( 

42 {self.a, self.b}, 

43 payload=iteration.RowSequence([{self.a: 2, self.b: 15}, {self.a: 3, self.b: 20}]), 

44 name="leaf_2", 

45 ) 

46 

47 def test_attributes(self) -> None: 

48 """Check that all Relation attributes have the expected values.""" 

49 relation = self.leaf_1.chain(self.leaf_2) 

50 assert isinstance(relation, BinaryOperationRelation) 

51 self.assertEqual(relation.columns, {self.a, self.b}) 

52 self.assertEqual(relation.engine, self.engine) 

53 self.assertEqual(relation.min_rows, 4) 

54 self.assertEqual(relation.max_rows, 4) 

55 self.assertFalse(relation.is_locked) 

56 operation = relation.operation 

57 assert isinstance(operation, Chain) 

58 

59 def test_apply_failures(self) -> None: 

60 """Test failure modes of constructing and applying Chains.""" 

61 new_engine = iteration.Engine(name="other") 

62 leaf_3 = new_engine.make_leaf( 

63 {self.a, self.b}, 

64 payload=iteration.RowSequence([{self.a: 3, self.b: 4}]), 

65 name="leaf_3", 

66 ) 

67 with self.assertRaises(EngineError): 

68 self.leaf_1.chain(leaf_3) 

69 leaf_4 = self.engine.make_leaf( 

70 {self.a}, 

71 payload=iteration.RowSequence([{self.a: 3}]), 

72 name="leaf_4", 

73 ) 

74 with self.assertRaises(ColumnError): 

75 self.leaf_1.chain(leaf_4) 

76 

77 def test_iteration(self) -> None: 

78 """Test Chain execution in the iteration engine.""" 

79 relation = self.leaf_1.chain(self.leaf_2) 

80 self.assertEqual( 

81 list(self.engine.execute(relation)), 

82 list(self.leaf_1.payload) + list(self.leaf_2.payload), 

83 ) 

84 

85 def test_str(self) -> None: 

86 """Test str(Chain) and str(BinaryOperationRelation[Chain]).""" 

87 relation = self.leaf_1.chain(self.leaf_2) 

88 self.assertEqual(str(relation), "leaf_1 ∪ leaf_2") 

89 # Nested operations get parentheses, unless they're chains or leaves. 

90 leaf_3 = self.engine.make_leaf( 

91 {self.a, self.b}, 

92 payload=iteration.RowSequence([{self.a: 3, self.b: 4}]), 

93 name="leaf_3", 

94 ) 

95 self.assertEqual(str(relation.chain(leaf_3)), "leaf_1 ∪ leaf_2 ∪ leaf_3") 

96 self.assertEqual(str(self.leaf_1.join(self.leaf_2).chain(leaf_3)), "(leaf_1 ⋈ leaf_2) ∪ leaf_3") 

97 

98 

99if __name__ == "__main__": 99 ↛ 100line 99 didn't jump to line 100, because the condition on line 99 was never true

100 unittest.main()