From 8761aebd5e28a1e0c3dcedff09b41fec92737ebb Mon Sep 17 00:00:00 2001
From: "Benjamin Scholtysik (Reimold)" <bereimol@microsoft.com>
Date: Wed, 18 Oct 2017 13:31:27 -0700
Subject: [PATCH] Add unit test to check thread safety.

---
 Support/HockeySDKTests/BITChannelTests.m | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Support/HockeySDKTests/BITChannelTests.m b/Support/HockeySDKTests/BITChannelTests.m
index 955da6f7fa..fc437dea82 100644
--- a/Support/HockeySDKTests/BITChannelTests.m
+++ b/Support/HockeySDKTests/BITChannelTests.m
@@ -120,4 +120,24 @@
   XCTAssertEqual(strcmp(BITTelemetryEventBuffer,""), 0);
 }
 
+- (void) testBITEventBufferThreadSafety {
+  int count = 1000;
+  XCTestExpectation *expectation1 = [[XCTestExpectation alloc] initWithDescription:@"append"];
+  XCTestExpectation *expectation2 = [[XCTestExpectation alloc] initWithDescription:@"reset"];
+  dispatch_async(dispatch_queue_create("queue1", DISPATCH_QUEUE_SERIAL), ^{
+    for(int i = 0; i < count; i++) {
+      bit_appendStringToEventBuffer([NSString stringWithFormat:@"%d", i], &BITTelemetryEventBuffer);
+    }
+    [expectation1 fulfill];
+  });
+  dispatch_async(dispatch_queue_create("queue2", DISPATCH_QUEUE_SERIAL), ^{
+    for(int i = 0; i < count; i++) {
+      bit_resetEventBuffer(&BITTelemetryEventBuffer);
+    }
+    [expectation2 fulfill];
+  });
+  [self waitForExpectations:@[expectation1, expectation2] timeout: 10];
+  XCTAssertTrue(true);
+}
+
 @end