add

codegen-core/src/test/kotlin/software/amazon/smithy/rust/codegen/core/smithy/generators/BuilderGeneratorTest.kt

@@ -18,13 +18,16 @@ import software.amazon.smithy.rust.codegen.core.testutil.TestWorkspace
 import software.amazon.smithy.rust.codegen.core.testutil.compileAndTest
 import software.amazon.smithy.rust.codegen.core.testutil.testSymbolProvider
 import software.amazon.smithy.rust.codegen.core.testutil.unitTest
+import kotlin.io.path.extension
+import kotlin.io.path.readText
 
 internal class BuilderGeneratorTest {
     private val model = StructureGeneratorTest.model
     private val inner = StructureGeneratorTest.inner
     private val struct = StructureGeneratorTest.struct
     private val credentials = StructureGeneratorTest.credentials
     private val secretStructure = StructureGeneratorTest.secretStructure
+    private val errorStruct = StructureGeneratorTest.error
 
     @Test
     fun `generate builders`() {
@@ -137,4 +140,30 @@ internal class BuilderGeneratorTest {
         }
         project.compileAndTest()
     }
+
+    @Test
+    fun `don't add serde to error types`() {
+        val provider = testSymbolProvider(model)
+        val project = TestWorkspace.testProject(provider)
+        project.moduleFor(errorStruct) {
+            rust("##![allow(deprecated)]")
+            StructureGenerator(model, provider, this, errorStruct, emptyList()).render()
+            implBlock(provider.toSymbol(errorStruct)) {
+                BuilderGenerator.renderConvenienceMethod(this, provider, errorStruct)
+            }
+        }
+        project.withModule(provider.moduleForBuilder(errorStruct)) {
+            BuilderGenerator(model, provider, errorStruct, emptyList()).render(this)
+        }
+        project.compileAndTest()
+
+        // checks if there is a serde derive in the code
+        project.generatedFiles().forEach {
+            if (it.extension == "rs") {
+                val file = project.baseDir.resolve(it).toFile().readText()
+                val check = file.contains("derive(serde::Deserialize)") || file.contains("derive(serde::Serialize)")
+                assert(!check)
+            }
+        }
+    }
 }