Verify places managing crates stabilities are in sync

This commit addresses #3082 (comment)

buildSrc/src/main/kotlin/CrateSet.kt

@@ -7,7 +7,7 @@ data class Crate(val name: String, val versionPropertyName: String)
 
 object CrateSet {
     const val STABLE_VERSION_PROP_NAME = "smithy.rs.runtime.crate.stable.version"
-    private const val UNSTABLE_VERSION_PROP_NAME = "smithy.rs.runtime.crate.unstable.version"
+    const val UNSTABLE_VERSION_PROP_NAME = "smithy.rs.runtime.crate.unstable.version"
 
     /*
      * Crates marked as `STABLE_VERSION_PROP_NAME` should have the following package metadata in their `Cargo.toml`
@@ -29,7 +29,7 @@ object CrateSet {
         Crate("aws-types", STABLE_VERSION_PROP_NAME),
     )
 
-    private val SMITHY_RUNTIME_COMMON = listOf(
+    val SMITHY_RUNTIME_COMMON = listOf(
         Crate("aws-smithy-async", STABLE_VERSION_PROP_NAME),
         Crate("aws-smithy-checksums", UNSTABLE_VERSION_PROP_NAME),
         Crate("aws-smithy-client", UNSTABLE_VERSION_PROP_NAME),
@@ -49,7 +49,7 @@ object CrateSet {
 
     val AWS_SDK_SMITHY_RUNTIME = SMITHY_RUNTIME_COMMON
 
-    private val SERVER_SMITHY_RUNTIME = SMITHY_RUNTIME_COMMON + listOf(
+    val SERVER_SMITHY_RUNTIME = SMITHY_RUNTIME_COMMON + listOf(
         Crate("aws-smithy-http-server", UNSTABLE_VERSION_PROP_NAME),
         Crate("aws-smithy-http-server-python", UNSTABLE_VERSION_PROP_NAME),
         Crate("aws-smithy-http-server-typescript", UNSTABLE_VERSION_PROP_NAME),

buildSrc/src/test/kotlin/CrateSetTest.kt

@@ -0,0 +1,72 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import CrateSet.AWS_SDK_RUNTIME
+import CrateSet.SERVER_SMITHY_RUNTIME
+import CrateSet.SMITHY_RUNTIME_COMMON
+import CrateSet.STABLE_VERSION_PROP_NAME
+import CrateSet.UNSTABLE_VERSION_PROP_NAME
+import com.moandjiezana.toml.Toml
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import java.io.File
+import java.util.logging.Logger
+
+class CrateSetTest {
+    private val logger: Logger = Logger.getLogger("CrateSetTest")
+
+    /*
+     * Checks whether `versionPropertyName` for a system under test, i.e. `Crate` in `CrateSet.kt`,
+     * matches what `package.metadata.smithy-rs-release-tooling` says in the `Cargo.toml`
+     * for the corresponding crate.
+     */
+    private fun sutStabilityMatchesManifestStability(versionPropertyName: String, stabilityInManifest: Boolean) {
+        when (stabilityInManifest) {
+            true -> assertEquals(STABLE_VERSION_PROP_NAME, versionPropertyName)
+            false -> assertEquals(UNSTABLE_VERSION_PROP_NAME, versionPropertyName)
+        }
+    }
+
+    /*
+     * Checks whether each element in `crateSet` specifies the correct `versionPropertyName` according to
+     * what `package.metadata.smithy-rs-release-tooling` says in the `Cargo.toml` for the corresponding crate,
+     * located at `relativePathToRustRuntime`.
+     *
+     * If `package.metadata.smithy-rs-release-tooling` does not exist in a `Cargo.toml`, the implementation
+     * will treat that crate as unstable.
+     */
+    private fun crateSetStabilitiesMatchManifestStabilities(crateSet: List<Crate>, relativePathToRustRuntime: String) {
+        crateSet.forEach {
+            val path = "$relativePathToRustRuntime/${it.name}/Cargo.toml"
+            val contents = File(path).readText()
+            val manifest = try {
+                Toml().read(contents)
+            } catch (e: java.lang.IllegalStateException) {
+                // Currently, `aws-sigv4` cannot be read as a `TOML` because of the following error:
+                // Invalid table definition on line 54: [target.'cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))'.dev-dependencies]]
+                logger.info("failed to read ${it.name} as TOML: $e")
+                Toml()
+            }
+            manifest.getTable("package.metadata.smithy-rs-release-tooling")?.entrySet()?.map { entry ->
+                sutStabilityMatchesManifestStability(it.versionPropertyName, entry.value as Boolean)
+            } ?: sutStabilityMatchesManifestStability(it.versionPropertyName, false)
+        }
+    }
+
+    @Test
+    fun `aws runtime stabilities should match those in manifest files`() {
+        crateSetStabilitiesMatchManifestStabilities(AWS_SDK_RUNTIME, "../aws/rust-runtime")
+    }
+
+    @Test
+    fun `common smithy runtime stabilities should match those in manifest files`() {
+        crateSetStabilitiesMatchManifestStabilities(SMITHY_RUNTIME_COMMON, "../rust-runtime")
+    }
+
+    @Test
+    fun `server smithy runtime stabilities should match those in manifest files`() {
+        crateSetStabilitiesMatchManifestStabilities(SERVER_SMITHY_RUNTIME, "../rust-runtime")
+    }
+}