chore: Add unauthenticated API integration test

IntegrationTests/Package.swift

@@ -107,6 +107,8 @@ func addIntegrationTestTarget(_ name: String) {
         additionalDependencies = ["AWSCloudFront"]
     case "AWSSTS":
         additionalDependencies = ["AWSIAM", "AWSCognitoIdentity"]
+    case "AWSCognitoIdentity":
+        additionalDependencies = ["AWSSTS"]
     default:
         break
     }
@@ -145,6 +147,7 @@ let servicesWithIntegrationTests: [String] = [
     "AWSSQS",
     "AWSSTS",
     "AWSTranscribeStreaming",
+    "AWSCognitoIdentity",
 ]
 
 func addIntegrationTests() {

IntegrationTests/Services/AWSCognitoIdentityIntegrationTests/UnauthenticatedAPITests.swift

@@ -0,0 +1,52 @@
+//
+// Copyright Amazon.com Inc. or its affiliates.
+// All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+import XCTest
+import AWSSTS
+import AWSCognitoIdentity
+import AWSClientRuntime
+
+/// Tests unauthenciated API using AWSCognitoIdentity::getId
+class UnauthenticatedAPITests: XCTestCase {
+    private let region = "us-east-1"
+    private var stsClient: STSClient!
+    private var cognitoIdentityClient: CognitoIdentityClient!
+
+    private var accountID: String!
+    private var identityPoolID: String!
+    private let identityPoolName = "idpool" + UUID().uuidString.split(separator: "-").first!.lowercased()
+
+    override func setUp() async throws {
+        // Set up clients
+        stsClient = try STSClient(region: region)
+        cognitoIdentityClient = try CognitoIdentityClient(region: region)
+
+        // Create identity pool & save its ID
+        identityPoolID = try await cognitoIdentityClient.createIdentityPool(input: CreateIdentityPoolInput(
+            allowUnauthenticatedIdentities: true,
+            identityPoolName: identityPoolName
+        )).identityPoolId
+
+        // Get and save account ID that has the identity pool
+        accountID = try await stsClient.getCallerIdentity(input: GetCallerIdentityInput()).account
+    }
+
+    override func tearDown() async throws {
+        // Delete identity pool
+        _ = try await cognitoIdentityClient.deleteIdentityPool(input: DeleteIdentityPoolInput(
+            identityPoolId: identityPoolID
+        ))
+    }
+
+    func testUnauthenticatedAPI() async throws {
+        let id = try await cognitoIdentityClient.getId(
+            input: GetIdInput(accountId: accountID, identityPoolId: identityPoolID)
+        ).identityId ?? ""
+        // Assert that successful response was returned with a nonempty ID.
+        XCTAssertTrue(id.count > 0)
+    }
+}