Psr transport network exception test (#1635)

* add test for NetworkException in PsrTransport

* remove unneeded exception expectation

Author: brettmc

tests/Unit/SDK/Common/Export/Http/PsrTransportTest.php

@@ -11,13 +11,15 @@
 use function gzdecode;
 use function gzencode;
 use InvalidArgumentException;
+use Nyholm\Psr7\Request;
 use Nyholm\Psr7\Response;
 use OpenTelemetry\SDK\Common\Export\Http\PsrTransport;
 use OpenTelemetry\SDK\Common\Export\Http\PsrTransportFactory;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Client\ClientInterface;
+use Psr\Http\Client\NetworkExceptionInterface;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 
@@ -152,6 +154,28 @@ public function test_send_number_of_retries(): void
         $response->await();
     }
 
+    public function test_send_retry_network_exception_returns_error(): void
+    {
+        $e = new class('network error') extends \Exception implements NetworkExceptionInterface {
+            public function getRequest(): RequestInterface
+            {
+                return new Request('GET', 'http://localhost');
+            }
+        };
+        $this->client->expects($this->exactly(4))->method('sendRequest')->willThrowException($e);
+        $transport = $this->factory->create('http://localhost', 'text/plain', [], null, 10., 100, 3);
+
+        $response = $transport->send('');
+
+        try {
+            $response->await();
+        } catch (Exception $e) {
+            $this->assertStringContainsString('retry limit', $e->getMessage());
+            $this->assertNotNull($e->getPrevious());
+            $this->assertSame('network error', $e->getPrevious()->getMessage());
+        }
+    }
+
     public function test_send_exception_returns_error(): void
     {
         $this->client->expects($this->once())->method('sendRequest')->willThrowException(new Exception());