googleapis · Hectorhammett · Jun 24, 2026 · bshaffer · Jun 24, 2026 · Hectorhammett
@@ -10,7 +10,7 @@ jobs:
     gapic-showcase:
         runs-on: ubuntu-latest
         env:
-            GAPIC_SHOWCASE_VERSION: 0.36.2
+            GAPIC_SHOWCASE_VERSION: 0.40.0
             OS: linux
             ARCH: amd64
         name: GAPIC Showcase Conformance Tests
@@ -21,18 +21,25 @@ jobs:
         - name: Setup PHP
           uses: shivammathur/setup-php@v2
           with:
-            php-version: '8.1'
+            php-version: '8.2'
             extensions: grpc
 
-        - name: Install and run GAPIC Showcase
+        - name: Set up Go
+          uses: actions/setup-go@v5
+          with:
+            go-version: '>=1.26'
+
+        - name: Install GAPIC Showcase from Branch
           run: |
-            curl -L https://github.com/googleapis/gapic-showcase/releases/download/v${GAPIC_SHOWCASE_VERSION}/gapic-showcase-${GAPIC_SHOWCASE_VERSION}-${OS}-${ARCH}.tar.gz | tar -zx
-            ./gapic-showcase run &
+            go install github.com/googleapis/gapic-showcase@feat-pqc-tls
+
+        - name: Run the GAPIC showcase server
+          run: |
+            gapic-showcase run --port :7469 --tls --ca-cert-output-file showcase.pem & sleep 5
 
         - name: Install dependencies
           run: |
             composer update --prefer-dist --no-interaction --no-suggest -d Gax/
 
         - name: Run PHPUnit
           run: Gax/vendor/bin/phpunit -c Gax/phpunit-conformance.xml.dist
-
@@ -0,0 +1,100 @@
+<?php
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+declare(strict_types=1);
+
+namespace Google\Generator\Tests\Conformance;
+
+use Google\ApiCore\InsecureCredentialsWrapper;
+use Google\ApiCore\RequestBuilder;
+use Google\ApiCore\Transport\GrpcTransport;
+use Google\ApiCore\Transport\RestTransport;
+use Google\ApiCore\Transport\TransportInterface;
+use Google\Auth\HttpHandler\HttpHandlerFactory;
+use Google\Showcase\V1beta1\Client\EchoClient;
+use Google\Showcase\V1beta1\EchoRequest;
+use Grpc\ChannelCredentials;
+use GuzzleHttp\Client;
+use PHPUnit\Framework\TestCase;
+
+class PqcShowcaseTest extends TestCase
+{
+    private const TLS_GROUP = 'x-showcase-tls-group';
+    private const TLS_VERSION = 'x-showcase-tls-version';
+
+    public function provideTransport(): array
+    {
+        $pemPath = __DIR__ . '/showcase.pem';
+        $host = 'localhost:7469';
+
+        // gRPC Configuration
+        $pemContents = file_get_contents($pemPath);
+        if (!$pemContents) {
+            $this->fail('Could not read showcase.pem');
+        }
+
+        $grpcTransport = GrpcTransport::build($host, [
+            'stubOpts' => [
+                'credentials' => ChannelCredentials::createSsl($pemContents)
+            ]
+        ]);
+
+        // REST Configuration
+        $restConfigPath = __DIR__ . '/src/V1beta1/resources/echo_rest_client_config.php';
+
+        $requestBuilder = new RequestBuilder($host, $restConfigPath);
+        $guzzleClient = new Client([
+            'verify' => $pemPath
+        ]);
+        $httpHandler = HttpHandlerFactory::build($guzzleClient);
+        $restTransport = new RestTransport($requestBuilder, [$httpHandler, 'async']);
+
+        return [[$grpcTransport], [$restTransport]];
+    }
+
+    /** @dataProvider provideTransport */
+    public function testPqc(TransportInterface $transport): void
+    {
+        $expected = 'This is a test';
+        $expectedGroup = 'X25519MLKEM768';
+        $expectedVersion = 'TLS 1.3';
+        $responseHeaders = null;
+        $metadataCallback = function (array $metadata) use (&$responseHeaders) {
+            $responseHeaders = $metadata;
+        };
+
+        $echoClient = new EchoClient([
+            'credentials' => new InsecureCredentialsWrapper(),
+            'transport' => $transport
+        ]);
+
+        $echoRequest = new EchoRequest();
+        $echoRequest->setContent($expected);
+        $response = $echoClient->echo($echoRequest, [
+            'metadataCallback' => $metadataCallback
+        ]);
+
+        $this->assertEquals($expected, $response->getContent());
+        $this->assertNotNull($responseHeaders);
+
+        /** @var array<string, array<int, string>> $responseHeaders */
+        $responseHeaders = array_change_key_case($responseHeaders, CASE_LOWER);
+
+        $this->assertEquals($expectedVersion, $responseHeaders[self::TLS_VERSION][0]);
+        $this->assertEquals($expectedGroup, $responseHeaders[self::TLS_GROUP][0]);
+    }
+}