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test_graph.py
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test_graph.py
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from django.test import TestCase
from django.db.migrations.graph import MigrationGraph, CircularDependencyError
class GraphTests(TestCase):
"""
Tests the digraph structure.
"""
def test_simple_graph(self):
"""
Tests a basic dependency graph:
app_a: 0001 <-- 0002 <--- 0003 <-- 0004
/
app_b: 0001 <-- 0002 <-/
"""
# Build graph
graph = MigrationGraph()
graph.add_node(("app_a", "0001"), None)
graph.add_node(("app_a", "0002"), None)
graph.add_node(("app_a", "0003"), None)
graph.add_node(("app_a", "0004"), None)
graph.add_node(("app_b", "0001"), None)
graph.add_node(("app_b", "0002"), None)
graph.add_dependency("app_a.0004", ("app_a", "0004"), ("app_a", "0003"))
graph.add_dependency("app_a.0003", ("app_a", "0003"), ("app_a", "0002"))
graph.add_dependency("app_a.0002", ("app_a", "0002"), ("app_a", "0001"))
graph.add_dependency("app_a.0003", ("app_a", "0003"), ("app_b", "0002"))
graph.add_dependency("app_b.0002", ("app_b", "0002"), ("app_b", "0001"))
# Test root migration case
self.assertEqual(
graph.forwards_plan(("app_a", "0001")),
[('app_a', '0001')],
)
# Test branch B only
self.assertEqual(
graph.forwards_plan(("app_b", "0002")),
[("app_b", "0001"), ("app_b", "0002")],
)
# Test whole graph
self.assertEqual(
graph.forwards_plan(("app_a", "0004")),
[('app_b', '0001'), ('app_b', '0002'), ('app_a', '0001'), ('app_a', '0002'), ('app_a', '0003'), ('app_a', '0004')],
)
# Test reverse to b:0002
self.assertEqual(
graph.backwards_plan(("app_b", "0002")),
[('app_a', '0004'), ('app_a', '0003'), ('app_b', '0002')],
)
# Test roots and leaves
self.assertEqual(
graph.root_nodes(),
[('app_a', '0001'), ('app_b', '0001')],
)
self.assertEqual(
graph.leaf_nodes(),
[('app_a', '0004'), ('app_b', '0002')],
)
def test_complex_graph(self):
"""
Tests a complex dependency graph:
app_a: 0001 <-- 0002 <--- 0003 <-- 0004
\ \ / /
app_b: 0001 <-\ 0002 <-X /
\ \ /
app_c: \ 0001 <-- 0002 <-
"""
# Build graph
graph = MigrationGraph()
graph.add_node(("app_a", "0001"), None)
graph.add_node(("app_a", "0002"), None)
graph.add_node(("app_a", "0003"), None)
graph.add_node(("app_a", "0004"), None)
graph.add_node(("app_b", "0001"), None)
graph.add_node(("app_b", "0002"), None)
graph.add_node(("app_c", "0001"), None)
graph.add_node(("app_c", "0002"), None)
graph.add_dependency("app_a.0004", ("app_a", "0004"), ("app_a", "0003"))
graph.add_dependency("app_a.0003", ("app_a", "0003"), ("app_a", "0002"))
graph.add_dependency("app_a.0002", ("app_a", "0002"), ("app_a", "0001"))
graph.add_dependency("app_a.0003", ("app_a", "0003"), ("app_b", "0002"))
graph.add_dependency("app_b.0002", ("app_b", "0002"), ("app_b", "0001"))
graph.add_dependency("app_a.0004", ("app_a", "0004"), ("app_c", "0002"))
graph.add_dependency("app_c.0002", ("app_c", "0002"), ("app_c", "0001"))
graph.add_dependency("app_c.0001", ("app_c", "0001"), ("app_b", "0001"))
graph.add_dependency("app_c.0002", ("app_c", "0002"), ("app_a", "0002"))
# Test branch C only
self.assertEqual(
graph.forwards_plan(("app_c", "0002")),
[('app_b', '0001'), ('app_c', '0001'), ('app_a', '0001'), ('app_a', '0002'), ('app_c', '0002')],
)
# Test whole graph
self.assertEqual(
graph.forwards_plan(("app_a", "0004")),
[('app_b', '0001'), ('app_c', '0001'), ('app_a', '0001'), ('app_a', '0002'), ('app_c', '0002'), ('app_b', '0002'), ('app_a', '0003'), ('app_a', '0004')],
)
# Test reverse to b:0001
self.assertEqual(
graph.backwards_plan(("app_b", "0001")),
[('app_a', '0004'), ('app_c', '0002'), ('app_c', '0001'), ('app_a', '0003'), ('app_b', '0002'), ('app_b', '0001')],
)
# Test roots and leaves
self.assertEqual(
graph.root_nodes(),
[('app_a', '0001'), ('app_b', '0001'), ('app_c', '0001')],
)
self.assertEqual(
graph.leaf_nodes(),
[('app_a', '0004'), ('app_b', '0002'), ('app_c', '0002')],
)
def test_circular_graph(self):
"""
Tests a circular dependency graph.
"""
# Build graph
graph = MigrationGraph()
graph.add_node(("app_a", "0001"), None)
graph.add_node(("app_a", "0002"), None)
graph.add_node(("app_a", "0003"), None)
graph.add_node(("app_b", "0001"), None)
graph.add_node(("app_b", "0002"), None)
graph.add_dependency("app_a.0003", ("app_a", "0003"), ("app_a", "0002"))
graph.add_dependency("app_a.0002", ("app_a", "0002"), ("app_a", "0001"))
graph.add_dependency("app_a.0001", ("app_a", "0001"), ("app_b", "0002"))
graph.add_dependency("app_b.0002", ("app_b", "0002"), ("app_b", "0001"))
graph.add_dependency("app_b.0001", ("app_b", "0001"), ("app_a", "0003"))
# Test whole graph
self.assertRaises(
CircularDependencyError,
graph.forwards_plan, ("app_a", "0003"),
)
def test_plan_invalid_node(self):
"""
Tests for forwards/backwards_plan of nonexistent node.
"""
graph = MigrationGraph()
message = "Node ('app_b', '0001') not a valid node"
with self.assertRaisesMessage(ValueError, message):
graph.forwards_plan(("app_b", "0001"))
with self.assertRaisesMessage(ValueError, message):
graph.backwards_plan(("app_b", "0001"))
def test_missing_parent_nodes(self):
"""
Tests for missing parent nodes.
"""
# Build graph
graph = MigrationGraph()
graph.add_node(("app_a", "0001"), None)
graph.add_node(("app_a", "0002"), None)
graph.add_node(("app_a", "0003"), None)
graph.add_node(("app_b", "0001"), None)
graph.add_dependency("app_a.0003", ("app_a", "0003"), ("app_a", "0002"))
graph.add_dependency("app_a.0002", ("app_a", "0002"), ("app_a", "0001"))
with self.assertRaisesMessage(KeyError, "Migration app_a.0001 dependencies references nonexistent parent node ('app_b', '0002')"):
graph.add_dependency("app_a.0001", ("app_a", "0001"), ("app_b", "0002"))
def test_missing_child_nodes(self):
"""
Tests for missing child nodes.
"""
# Build graph
graph = MigrationGraph()
graph.add_node(("app_a", "0001"), None)
with self.assertRaisesMessage(KeyError, "Migration app_a.0002 dependencies references nonexistent child node ('app_a', '0002')"):
graph.add_dependency("app_a.0002", ("app_a", "0002"), ("app_a", "0001"))