Rig.TUnit.Databases.NoSql.Dynamo 0.1.0-beta.2

Rig.TUnit.Databases.NoSql.Dynamo

LocalStack-backed Amazon DynamoDB fixture with GsiVerifier for declarative Global-Secondary-Index assertions.

What this package is

The Rig.TUnit DynamoDB provider. DynamoFixture spins a LocalStack container with the DynamoDB feature enabled and exposes an AmazonDynamoDBClient pointing at it. Ships GsiVerifier — a declarative GSI assertion helper that checks name, partition key, sort key, and status against the live table schema, saving reams of boilerplate WAIT FOR GSI ACTIVE polling code.

When to use it

• Integration tests exercising DynamoDB-specific semantics (conditional writes, TransactionWrite, GSI projections).
• Asserting table+GSI definitions match the design spec.
• Not for: DAX (DynamoDB Accelerator) — LocalStack does not emulate.

Prerequisites

• .NET 10 SDK
• Docker Desktop / Colima (LocalStack image ~400 MB)
• AWSSDK.DynamoDBv2 (transitive)

Quick start

using Amazon.DynamoDBv2.Model;
using Rig.TUnit.Databases.NoSql.Dynamo.Fixtures;
using Rig.TUnit.Databases.NoSql.Dynamo.Helpers;

await using var fx = new DynamoFixture();
await fx.InitializeAsync();

await fx.Client.CreateTableAsync(new CreateTableRequest
{
 TableName = "orders",
 KeySchema = [new("Pk", Amazon.DynamoDBv2.KeyType.HASH)],
 AttributeDefinitions = [new("Pk", Amazon.DynamoDBv2.ScalarAttributeType.S)],
 BillingMode = Amazon.DynamoDBv2.BillingMode.PAY_PER_REQUEST,
});

Options

Fixture + helper APIs

• Rig.TUnit.Databases.NoSql.Dynamo.Fixtures.DynamoFixture
• Rig.TUnit.Databases.NoSql.Dynamo.Options.DynamoFixtureOptions
• Rig.TUnit.Databases.NoSql.Dynamo.Builder.DynamoRigBuilder
• Rig.TUnit.Databases.NoSql.Dynamo.Helpers.GsiVerifier
• Rig.TUnit.Databases.NoSql.Dynamo.Helpers.GsiExpectation

Per-test isolation

Per-test table naming via IsolationKey: orders_{IsolationKey:short}. Table create is ~100 ms (LocalStack's DynamoDB emulation is CPU-fast). Teardown deletes the table.

Parallelism + performance

• First-run pull: ~30 s.
• Warm startup: ~10 s.
• Per-test table create + delete: ~150 ms.
• Parallelism: 8+ typical — LocalStack handles concurrent DDL well.

Troubleshooting

• ResourceNotFoundException after CreateTableAsync — LocalStack creates the table asynchronously; WaitForTableActive or GsiVerifier.VerifyAsync polls until TableStatus=ACTIVE. Do not assume immediate readiness.
• Eventually consistent reads surprise tests — LocalStack defaults to strong consistency, but DynamoDB proper does not. Set ConsistentRead=true on your test queries to match the production guarantee.

See .

Provider quirks + edge cases

• LocalStack's DynamoDB emulation is close to production but diverges on: rate limiting (never throttles), per-table encryption metadata, and auto-scaling. Tests asserting these must run against real AWS.
• GSIs can project ALL, KEYS_ONLY, or INCLUDE; GsiExpectation currently validates name + keys, not projection shape (open issue).

Benchmarks

See ; baseline in benchmarks/baseline-005.json.

Related docs

• Family base:

License

MIT. See .