test(s3): add sanity test to catch regressions in size shape (#375)

Author: aajtodd

services/s3/common/test/aws/sdk/kotlin/services/s3/model/TestS3Size.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+package aws.sdk.kotlin.services.s3.model
+
+import kotlin.test.Test
+import kotlin.test.assertIs
+
+class TestS3Size {
+    @Test
+    fun testSizeIsLong() {
+        // verify no regressions in `Size` shape reverting to `Integer` (it should be `Long`)
+        // see: https://github.com/awslabs/aws-sdk-kotlin/issues/309
+
+        val obj = Object { size = 100 }
+        val req = PutObjectRequest { contentLength = 100 }
+        assertIs<Long>(obj.size)
+        assertIs<Long>(req.contentLength)
+    }
+}