Respond on exceptions thrown when on main thread

Summary: Changes FlipperPerformBlockOnMainThread to take a responder, and respond with an error if an exception is caught.

Reviewed By: passy

Differential Revision: D14066982

fbshipit-source-id: 70135bf58171684bcd013c66d9deec366aed36f5

iOS/FlipperKitTests/FlipperUtilTests.mm

@@ -0,0 +1,62 @@
+/*
+ *  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/FlipperPlugin.h>
+#import <FlipperKit/FlipperClient.h>
+#import <FlipperKit/FlipperClient+Testing.h>
+#import <FlipperKit/FlipperConnection.h>
+#import <FlipperKitTestUtils/BlockBasedSonarPlugin.h>
+#import <FlipperKitTestUtils/FlipperResponderMock.h>
+#import <FlipperTestLib/FlipperConnectionManagerMock.h>
+#import <FlipperTestLib/FlipperPluginMock.h>
+#import <folly/json.h>
+#import <vector>
+
+#import "FlipperPlugin.h"
+
+@interface FlipperUtilTests : XCTestCase
+
+@end
+
+@implementation FlipperUtilTests {
+    FlipperResponderMock *responder;
+}
+
+
+- (void)setUp {
+    responder = [FlipperResponderMock new];
+}
+
+- (void)testPerformOnMainThreadSuccess {
+    FlipperPerformBlockOnMainThread(^{}, responder);
+    NSAssert([responder.successes count] == 0, @"No successes are output");
+    NSAssert([responder.errors count] == 0, @"No errors are output");
+}
+
+- (void)testPerformOnMainThreadStdException {
+    FlipperPerformBlockOnMainThread(^{
+        throw new std::exception();
+    }, responder);
+    NSAssert([responder.successes count] == 0, @"No successes are output");
+    NSAssert([responder.errors count] == 1, @"1 error is output");
+}
+
+- (void)testPerformOnMainThreadNSException {
+    FlipperPerformBlockOnMainThread(^{
+        NSArray *a = [NSArray init];
+        [a objectAtIndex:1];
+    }, responder);
+    NSAssert([responder.successes count] == 0, @"No successes are output");
+    NSAssert([responder.errors count] == 1, @"1 error is output");
+}
+
+@end
+#endif