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name database-testing description Database schema validation, data integrity testing, migration testing, transaction isolation, and query performance. Use when testing data persistence, ensuring referential integrity, or validating database migrations. category specialized-testing priority high tokenEstimate 900 agents ["qe-test-data-architect","qe-test-executor","qe-performance-tester"] implementation_status optimized optimization_version 1 last_optimized 2025-12-02T00:00:00.000Z dependencies [] quick_reference_card true tags ["database","schema","migration","transactions","integrity","sql","performance"]
Database Testing
<default_to_action>
When testing database operations:
VALIDATE schema (tables, columns, constraints exist as expected)
TEST data integrity (unique, foreign key, check constraints)
VERIFY migrations (forward works, rollback works, data preserved)
CHECK transaction isolation (ACID properties, concurrent access)
MEASURE query performance (indexes used, execution time)
Quick DB Testing Checklist:
Schema matches specification
Unique constraints prevent duplicates
Foreign keys prevent orphaned records
Migrations are reversible
Transactions roll back on error
Critical Success Factors:
Database bugs cause data loss/corruption (catastrophic)
Test migrations in staging before production
Transaction tests catch concurrency bugs
</default_to_action>
Quick Reference Card
When to Use
New table/schema creation
Migration development
Data integrity validation
Query performance optimization
Database Test Types
Type Focus When Schema Structure correct Table creation Integrity Constraints work Data operations Migration Up/down work Schema changes Transaction ACID properties Concurrent access Performance Query speed Optimization
ACID Properties
Property Test Focus Atomicity All or nothing (rollback on error) Consistency Constraints always valid Isolation Concurrent transactions don't interfere Durability Committed data persists
Schema Testing
test ('users table has correct schema' , async () => {
const schema = await db.raw (`
SELECT column_name, data_type, is_nullable
FROM information_schema.columns
WHERE table_name = 'users'
` );
expect (schema).toContainEqual ({
column_name : 'id' ,
data_type : 'integer' ,
is_nullable : 'NO'
});
expect (schema).toContainEqual ({
column_name : 'email' ,
data_type : 'character varying' ,
is_nullable : 'NO'
});
});
Data Integrity Testing test ('email must be unique' , async () => {
await db.users .create ({ email : 'test@example.com' });
await expect (
db.users .create ({ email : 'test@example.com' })
).rejects .toThrow ('unique constraint violation' );
});
test ('foreign key prevents orphaned records' , async () => {
const user = await db.users .create ({ email : 'test@example.com' });
await db.orders .create ({ userId : user.id , total : 100 });
await expect (
db.users .delete ({ id : user.id })
).rejects .toThrow ('foreign key constraint' );
});
Migration Testing test ('migration is reversible' , async () => {
await migrate ('add-users-table' );
const tables = await db.raw (`SELECT table_name FROM information_schema.tables` );
expect (tables.map (t =>table_name )).toContain ('users' );
await rollback ('add-users-table' );
const tablesAfter = await db.raw (`SELECT table_name FROM information_schema.tables` );
expect (tablesAfter.map (t =>table_name )).not .toContain ('users' );
});
test ('migration preserves existing data' , async () => {
await db.users .create ({ email : 'test@example.com' });
await migrate ('add-age-column' );
const user = await db.users .findOne ({ email : 'test@example.com' });
expect (user).toBeDefined ();
expect (user.age ).toBeNull ();
});
Transaction Testing test ('transaction rolls back on error' , async () => {
const initialCount = await db.users .count ();
try {
await db.transaction (async (trx) => {
await trx ('users' ).insert ({ email : 'user1@example.com' });
await trx ('users' ).insert ({ email : 'user2@example.com' });
throw new Error ('Rollback test' );
});
} catch (error) { }
expect (await db.users .count ()).toBe (initialCount);
});
test ('concurrent transactions isolated' , async () => {
const user = await db.users .create ({ balance : 100 });
await Promise .all ([
db.transaction (async (trx) => {
const current = await trx ('users' ).where ({ id : user.id }).first ();
await trx ('users' ).update ({ balance : current.balance - 50 });
}),
db.transaction (async (trx) => {
const current = await trx ('users' ).where ({ id : user.id }).first ();
await trx ('users' ).update ({ balance : current.balance - 50 });
})
]);
const final = await db.users .findOne ({ id : user.id });
expect (final.balance ).toBe (0 );
});
Agent-Driven Database Testing
await Task ("Generate Test Data" , {
schema : 'ecommerce' ,
tables : ['users' , 'products' , 'orders' ],
count : { users : 1000 , products : 500 , orders : 5000 },
preserveReferentialIntegrity : true
}, "qe-test-data-architect" );
await Task ("Migration Test" , {
migration : 'add-payment-status-column' ,
tests : ['forward' , 'rollback' , 'data-preservation' ],
environment : 'staging'
}, "qe-test-executor" );
Agent Coordination Hints
Memory Namespace aqe/database-testing/
├── schema-snapshots/* - Current schema state
├── migrations/* - Migration test results
├── integrity/* - Constraint validation
└── performance/* - Query benchmarks
Fleet Coordination const dbFleet = await FleetManager .coordinate ({
strategy : 'database-testing' ,
agents : [
'qe-test-data-architect' ,
'qe-test-executor' ,
'qe-performance-tester'
],
topology : 'sequential'
});
Related Skills
Remember Database bugs are catastrophic. Data loss is unrecoverable. Corruption spreads silently. Performance issues compound.
Test migrations before production: Forward works, rollback works, data preserved, performance acceptable. Never deploy untested migrations.
With Agents: qe-test-data-architect generates realistic test data with referential integrity. qe-test-executor validates migrations automatically in CI/CD.
