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42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
from unittest import mock
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from django.db import DEFAULT_DB_ALIAS, DatabaseError, connection
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from django.db.models.sql import Query
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from django.db.models.sql.compiler import SQLCompiler
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from django.test import TestCase
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from .models import Item
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class SQLCompilerTest(TestCase):
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def test_repr(self):
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query = Query(Item)
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compiler = query.get_compiler(DEFAULT_DB_ALIAS, connection)
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self.assertEqual(
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repr(compiler),
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f"<SQLCompiler model=Item connection="
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f"<DatabaseWrapper vendor={connection.vendor!r} alias='default'> "
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f"using='default'>",
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)
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def test_execute_sql_suppresses_cursor_closing_failure_on_exception(self):
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query = Query(Item)
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compiler = SQLCompiler(query, connection, None)
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cursor = mock.MagicMock()
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# When execution fails, the cursor may have been closed.
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# Django's attempt to close it again will fail, and needs catching.
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execute_err = DatabaseError("execute failed")
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cursor.execute.side_effect = execute_err
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cursor.close.side_effect = DatabaseError("close failed")
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with mock.patch.object(connection, "cursor", return_value=cursor):
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with self.assertRaises(DatabaseError) as ctx:
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compiler.execute_sql("SELECT 1", [])
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# There is no irrelevant context from trying to close a closed cursor.
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exc = ctx.exception
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self.assertIs(exc, execute_err)
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self.assertIsNone(exc.__cause__)
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self.assertTrue(exc.__suppress_context__)
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