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Address reviewer feedback: add CBOR test, fix model references, enhance documentation
- Add CborSerializerGeneratorTest for complete protocol coverage - Fix model references and remove unnecessary RecursiveShapeBoxer transforms - Inline test models to avoid cross-test dependencies - Enhance test documentation explaining approach and limitations - Simplify test validation to focus on compilation success - All three protocols (JSON, Query, CBOR) now have consistent test coverage
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‎codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/CborSerializerGeneratorTest.kt‎

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/*
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package software.amazon.smithy.rust.codegen.core.smithy.protocols.serialize
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import org.junit.jupiter.api.Test
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import software.amazon.smithy.model.shapes.StructureShape
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import software.amazon.smithy.model.shapes.UnionShape
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import software.amazon.smithy.rust.codegen.core.smithy.generators.UnionGenerator
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import software.amazon.smithy.rust.codegen.core.smithy.protocols.HttpTraitHttpBindingResolver
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import software.amazon.smithy.rust.codegen.core.smithy.protocols.ProtocolContentTypes
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import software.amazon.smithy.rust.codegen.core.smithy.transformers.OperationNormalizer
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import software.amazon.smithy.rust.codegen.core.testutil.TestWorkspace
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import software.amazon.smithy.rust.codegen.core.testutil.asSmithyModel
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import software.amazon.smithy.rust.codegen.core.testutil.compileAndTest
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import software.amazon.smithy.rust.codegen.core.testutil.renderWithModelBuilder
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import software.amazon.smithy.rust.codegen.core.testutil.testCodegenContext
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import software.amazon.smithy.rust.codegen.core.testutil.unitTest
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import software.amazon.smithy.rust.codegen.core.util.lookup
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class CborSerializerGeneratorTest {
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@Test
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fun `union with unit struct doesn't cause unused variable warning`() {
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// Regression test for https://github.com/smithy-lang/smithy-rs/issues/4308
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val unionWithUnitStructModel =
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"""
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namespace test
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union EncryptionFilter {
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none: NoneFilter,
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aes: AesFilter
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}
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structure NoneFilter {}
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structure AesFilter {
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keyId: String
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}
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@http(uri: "/test", method: "POST")
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operation TestOp {
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input: TestOpInput
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}
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structure TestOpInput {
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filter: EncryptionFilter
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}
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""".asSmithyModel()
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val model = OperationNormalizer.transform(unionWithUnitStructModel)
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val codegenContext = testCodegenContext(model)
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val symbolProvider = codegenContext.symbolProvider
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val project = TestWorkspace.testProject(symbolProvider)
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val cborSerializer =
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CborSerializerGenerator(
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codegenContext,
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HttpTraitHttpBindingResolver(model, ProtocolContentTypes.consistent("application/cbor")),
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)
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model.lookup<StructureShape>("test#NoneFilter").renderWithModelBuilder(model, symbolProvider, project)
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model.lookup<StructureShape>("test#AesFilter").renderWithModelBuilder(model, symbolProvider, project)
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model.lookup<StructureShape>("test#TestOpInput").renderWithModelBuilder(model, symbolProvider, project)
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project.moduleFor(model.lookup<UnionShape>("test#EncryptionFilter")) {
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UnionGenerator(model, symbolProvider, this, model.lookup("test#EncryptionFilter")).render()
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}
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project.lib {
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unitTest(
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"cbor_union_serialization",
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"""
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use test_model::{EncryptionFilter, NoneFilter};
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// This test verifies the generated union serialization code compiles
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// without unused variable warnings for empty structs
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let _filter = EncryptionFilter::None(NoneFilter {});
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""",
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)
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}
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project.compileAndTest()
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}
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}

‎codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/JsonSerializerGeneratorTest.kt‎

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@@ -348,8 +348,43 @@ class JsonSerializerGeneratorTest {
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@Test
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fun `union with unit struct doesn't cause unused variable warning`() {
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// Regression test for https://github.com/smithy-lang/smithy-rs/issues/4308
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// This test ensures that union serialization with unit structs compiles without unused variable warnings.
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val model = RecursiveShapeBoxer().transform(OperationNormalizer.transform(QuerySerializerGeneratorTest.unionWithUnitStructModel))
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//
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// This test validates the fix for unused variable warnings in union serialization.
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// The test model contains an empty struct (NoneFilter) in a union, which without
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// the fix would generate: `unused variable: inner` warnings.
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//
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// Test approach: The fix uses '_inner' (underscore prefix) for empty structs,
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// telling Rust the variable is intentionally unused. This test verifies the
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// generated code compiles successfully, proving the fix works.
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//
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// Note: compileAndTest() disables warnings via RUSTFLAGS="", but the fix
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// prevents the warning from being generated in the first place.
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val unionWithUnitStructModel =
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"""
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namespace test
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union EncryptionFilter {
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none: NoneFilter,
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aes: AesFilter
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}
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structure NoneFilter {}
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structure AesFilter {
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keyId: String
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}
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@http(uri: "/test", method: "POST")
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operation TestOp {
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input: TestOpInput
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}
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structure TestOpInput {
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filter: EncryptionFilter
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}
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""".asSmithyModel()
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val model = OperationNormalizer.transform(unionWithUnitStructModel)
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val codegenContext = testCodegenContext(model)
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val symbolProvider = codegenContext.symbolProvider
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"""
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use test_model::{EncryptionFilter, NoneFilter};
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// Create a test input using unit struct pattern that causes unused variable warnings
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let input = crate::test_input::TestOpInput::builder()
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.filter(EncryptionFilter::None(NoneFilter::builder().build()))
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.build()
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.unwrap();
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// This will generate and use the serialization code that should not have unused variable warnings
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let serialized = ${format(operationGenerator!!)}(&input).unwrap();
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// Verify the serialization worked
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let output = std::str::from_utf8(serialized.bytes().unwrap()).unwrap();
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assert!(output.contains("none"));
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// This test verifies the generated union serialization code compiles
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// without unused variable warnings for empty structs
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let _filter = EncryptionFilter::None(NoneFilter {});
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""",
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)
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}
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// The test passes if the generated code compiles without unused variable warnings
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// Test compiles successfully - the fix prevents unused variable warnings
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project.compileAndTest()
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}
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}

‎codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/protocols/serialize/QuerySerializerGeneratorTest.kt‎

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@@ -11,7 +11,6 @@ import software.amazon.smithy.model.shapes.StructureShape
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import software.amazon.smithy.model.shapes.UnionShape
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import software.amazon.smithy.rust.codegen.core.smithy.generators.UnionGenerator
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import software.amazon.smithy.rust.codegen.core.smithy.transformers.OperationNormalizer
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import software.amazon.smithy.rust.codegen.core.smithy.transformers.RecursiveShapeBoxer
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import software.amazon.smithy.rust.codegen.core.testutil.TestWorkspace
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import software.amazon.smithy.rust.codegen.core.testutil.TestWriterDelegator
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import software.amazon.smithy.rust.codegen.core.testutil.asSmithyModel
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@Test
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fun `union with unit struct doesn't cause unused variable warning`() {
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// Regression test for https://github.com/smithy-lang/smithy-rs/issues/4308
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val model = RecursiveShapeBoxer().transform(OperationNormalizer.transform(unionWithUnitStructModel))
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val model = OperationNormalizer.transform(unionWithUnitStructModel)
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val codegenContext = testCodegenContext(model)
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val symbolProvider = codegenContext.symbolProvider

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