Add iOS client hang test

Summary: Check that it never hangs or crashes during startup

Reviewed By: priteshrnandgaonkar

Differential Revision: D10034630

fbshipit-source-id: b69ce9e6f91a5499a084c4d7328e6934ec92ece4

iOS/SonarKitTests/FlipperClientTests.mm

@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+#import <XCTest/XCTest.h>
+
+#if FB_SONARKIT_ENABLED
+
+#import <FlipperKit/FlipperClient.h>
+
+@interface FlipperClientTests : XCTestCase
+@end
+
+@implementation FlipperClientTests
+
+- (void)testStartingClientDoesntCrashOrHang {
+  FlipperClient *client = [FlipperClient sharedClient];
+  [client start];
+}
+
+@end
+
+#endif