Added unit tests for module init

Summary: The module initialization process is complex and full of race conditions. This diff adds a set of unit tests that verify that modules setup happens in the correct order, and enforces all the various conditions for main/background init.

Reviewed By: javache

Differential Revision: D2994145

fb-gh-sync-id: 92ea84508cdeeb280ff0fb9e9b2dffa8dbc37e66
shipit-source-id: 92ea84508cdeeb280ff0fb9e9b2dffa8dbc37e66

Examples/UIExplorer/UIExplorer.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		1300627F1B59179B0043FE5A /* RCTGzipTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 1300627E1B59179B0043FE5A /* RCTGzipTests.m */; };
+		13129DD41C85F87C007D611C /* RCTModuleInitNotificationRaceTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 13129DD31C85F87C007D611C /* RCTModuleInitNotificationRaceTests.m */; };
 		1323F1891C04AB9F0091BED0 /* bunny.png in Resources */ = {isa = PBXBuildFile; fileRef = 1323F1851C04AB9F0091BED0 /* bunny.png */; };
 		1323F18A1C04AB9F0091BED0 /* flux@3x.png in Resources */ = {isa = PBXBuildFile; fileRef = 1323F1861C04AB9F0091BED0 /* flux@3x.png */; };
 		1323F18B1C04AB9F0091BED0 /* hawk.png in Resources */ = {isa = PBXBuildFile; fileRef = 1323F1871C04AB9F0091BED0 /* hawk.png */; };
@@ -18,6 +19,7 @@
 		1341802C1AA9178B003F314A /* libRCTNetwork.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 1341802B1AA91779003F314A /* libRCTNetwork.a */; };
 		134454601AAFCABD003F0779 /* libRCTAdSupport.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 1344545A1AAFCAAE003F0779 /* libRCTAdSupport.a */; };
 		134A8A2A1AACED7A00945AAE /* libRCTGeolocation.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 134A8A251AACED6A00945AAE /* libRCTGeolocation.a */; };
+		134CB92A1C85A38800265FA6 /* RCTModuleInitTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 134CB9291C85A38800265FA6 /* RCTModuleInitTests.m */; };
 		138D6A181B53CD440074A87E /* RCTShadowViewTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 138D6A161B53CD440074A87E /* RCTShadowViewTests.m */; };
 		138DEE241B9EDFB6007F4EA5 /* libRCTCameraRoll.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 138DEE091B9EDDDB007F4EA5 /* libRCTCameraRoll.a */; };
 		1393D0381B68CD1300E1B601 /* RCTModuleMethodTests.m in Sources */ = {isa = PBXBuildFile; fileRef = 1393D0371B68CD1300E1B601 /* RCTModuleMethodTests.m */; };
@@ -178,6 +180,7 @@
 /* Begin PBXFileReference section */
 		004D289E1AAF61C70097A701 /* UIExplorerUnitTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = UIExplorerUnitTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		1300627E1B59179B0043FE5A /* RCTGzipTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTGzipTests.m; sourceTree = "<group>"; };
+		13129DD31C85F87C007D611C /* RCTModuleInitNotificationRaceTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTModuleInitNotificationRaceTests.m; sourceTree = "<group>"; };
 		1323F1851C04AB9F0091BED0 /* bunny.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = bunny.png; sourceTree = "<group>"; };
 		1323F1861C04AB9F0091BED0 /* flux@3x.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = "flux@3x.png"; sourceTree = "<group>"; };
 		1323F1871C04AB9F0091BED0 /* hawk.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = hawk.png; sourceTree = "<group>"; };
@@ -188,6 +191,7 @@
 		134180261AA91779003F314A /* RCTNetwork.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = RCTNetwork.xcodeproj; path = ../../Libraries/Network/RCTNetwork.xcodeproj; sourceTree = "<group>"; };
 		134454551AAFCAAE003F0779 /* RCTAdSupport.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = RCTAdSupport.xcodeproj; path = ../../Libraries/AdSupport/RCTAdSupport.xcodeproj; sourceTree = "<group>"; };
 		134A8A201AACED6A00945AAE /* RCTGeolocation.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = RCTGeolocation.xcodeproj; path = ../../Libraries/Geolocation/RCTGeolocation.xcodeproj; sourceTree = "<group>"; };
+		134CB9291C85A38800265FA6 /* RCTModuleInitTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTModuleInitTests.m; sourceTree = "<group>"; };
 		138D6A161B53CD440074A87E /* RCTShadowViewTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTShadowViewTests.m; sourceTree = "<group>"; };
 		138DEE021B9EDDDB007F4EA5 /* RCTCameraRoll.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = RCTCameraRoll.xcodeproj; path = ../../Libraries/CameraRoll/RCTCameraRoll.xcodeproj; sourceTree = "<group>"; };
 		1393D0371B68CD1300E1B601 /* RCTModuleMethodTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCTModuleMethodTests.m; sourceTree = "<group>"; };
@@ -422,6 +426,8 @@
 				144D21231B2204C5006DB32B /* RCTImageUtilTests.m */,
 				13DB03471B5D2ED500C27245 /* RCTJSONTests.m */,
 				13DF61B51B67A45000EDB188 /* RCTMethodArgumentTests.m */,
+				134CB9291C85A38800265FA6 /* RCTModuleInitTests.m */,
+				13129DD31C85F87C007D611C /* RCTModuleInitNotificationRaceTests.m */,
 				1393D0371B68CD1300E1B601 /* RCTModuleMethodTests.m */,
 				138D6A161B53CD440074A87E /* RCTShadowViewTests.m */,
 				1497CFAB1B21F5E400C1F8F2 /* RCTUIManagerTests.m */,
@@ -882,7 +888,9 @@
 				1300627F1B59179B0043FE5A /* RCTGzipTests.m in Sources */,
 				1497CFAF1B21F5E400C1F8F2 /* RCTConvert_NSURLTests.m in Sources */,
 				1497CFAE1B21F5E400C1F8F2 /* RCTJSCExecutorTests.m in Sources */,
+				13129DD41C85F87C007D611C /* RCTModuleInitNotificationRaceTests.m in Sources */,
 				1497CFAD1B21F5E400C1F8F2 /* RCTBridgeTests.m in Sources */,
+				134CB92A1C85A38800265FA6 /* RCTModuleInitTests.m in Sources */,
 				1497CFB11B21F5E400C1F8F2 /* RCTEventDispatcherTests.m in Sources */,
 				1497CFB31B21F5E400C1F8F2 /* RCTUIManagerTests.m in Sources */,
 				13DB03481B5D2ED500C27245 /* RCTJSONTests.m in Sources */,
@@ -1276,4 +1284,4 @@
 /* End XCConfigurationList section */
 	};
 	rootObject = 83CBB9F71A601CBA00E9B192 /* Project object */;
-}
+}

Examples/UIExplorer/UIExplorerUnitTests/RCTBridgeTests.m

@@ -41,6 +41,8 @@
 
 @implementation TestExecutor
 
+@synthesize valid = _valid;
+
 RCT_EXPORT_MODULE()
 
 - (void)setUp {}
@@ -55,7 +57,7 @@ RCT_EXPORT_MODULE()
 
 - (BOOL)isValid
 {
-  return YES;
+  return _valid;
 }
 
 - (void)flushedQueue:(RCTJavaScriptCallback)onComplete
@@ -98,7 +100,10 @@ RCT_EXPORT_MODULE()
   onComplete(nil);
 }
 
-- (void)invalidate {}
+- (void)invalidate
+{
+  _valid = NO;
+}
 
 @end
 
@@ -132,7 +137,7 @@ RCT_EXPORT_MODULE(TestModule)
   [_bridge invalidate];
   [_bridge setUp];
 
-  _jsExecutor = [_bridge.batchedBridge valueForKey:@"javaScriptExecutor"];
+  _jsExecutor = _bridge.batchedBridge.javaScriptExecutor;
   XCTAssertNotNil(_jsExecutor);
 }
 
@@ -143,6 +148,7 @@ RCT_EXPORT_MODULE(TestModule)
   _testMethodCalled = NO;
 
   [_bridge invalidate];
+  RUN_RUNLOOP_WHILE(_jsExecutor.isValid);
   _bridge = nil;
 }
 

Examples/UIExplorer/UIExplorerUnitTests/RCTModuleInitNotificationRaceTests.m

@@ -0,0 +1,142 @@
+/**
+ * The examples provided by Facebook are for non-commercial testing and
+ * evaluation purposes only.
+ *
+ * Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import <Foundation/Foundation.h>
+#import <XCTest/XCTest.h>
+
+#import "RCTBridge.h"
+#import "RCTBridge+Private.h"
+#import "RCTBridgeModule.h"
+#import "RCTUtils.h"
+#import "RCTUIManager.h"
+#import "RCTViewManager.h"
+
+#define RUN_RUNLOOP_WHILE(CONDITION) \
+{ \
+  NSDate *timeout = [NSDate dateWithTimeIntervalSinceNow:5]; \
+  while ((CONDITION)) { \
+    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1]]; \
+    if ([timeout timeIntervalSinceNow] <= 0) { \
+      XCTFail(@"Runloop timed out before condition was met"); \
+      break; \
+    } \
+  } \
+}
+
+// Must be declared before RCTTestCustomSetBridgeModule in order to trigger the
+// race condition that we are testing for - namely that the
+// RCTDidInitializeModuleNotification for RCTTestViewManager gets sent before
+// setBridge: is called on RCTTestCustomSetBridgeModule
+@interface RCTTestViewManager : RCTViewManager
+@end
+
+@implementation RCTTestViewManager
+
+@synthesize bridge = _bridge;
+@synthesize methodQueue = _methodQueue;
+
+RCT_EXPORT_MODULE()
+
+- (void)setBridge:(RCTBridge *)bridge
+{
+  _bridge = bridge;
+  (void)[_bridge uiManager]; // Needed to trigger a race condition
+}
+
+- (NSArray<NSString *> *)customDirectEventTypes
+{
+  return @[@"foo"];
+}
+
+@end
+
+
+@interface RCTNotificationObserverModule : NSObject <RCTBridgeModule>
+
+@property (nonatomic, assign) BOOL didDetectViewManagerInit;
+
+@end
+
+@implementation RCTNotificationObserverModule
+
+@synthesize bridge = _bridge;
+
+RCT_EXPORT_MODULE()
+
+- (void)setBridge:(RCTBridge *)bridge
+{
+  _bridge = bridge;
+  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didInitViewManager:) name:RCTDidInitializeModuleNotification object:nil];
+}
+
+- (void)didInitViewManager:(NSNotification *)note
+{
+  id<RCTBridgeModule> module = note.userInfo[@"module"];
+  if ([module isKindOfClass:[RCTTestViewManager class]]) {
+    _didDetectViewManagerInit = YES;
+  }
+}
+
+- (void)dealloc
+{
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+@end
+
+
+@interface RCTModuleInitNotificationRaceTests : XCTestCase <RCTBridgeDelegate>
+{
+  RCTBridge *_bridge;
+  RCTNotificationObserverModule *_notificationObserver;
+}
+@end
+
+@implementation RCTModuleInitNotificationRaceTests
+
+- (NSURL *)sourceURLForBridge:(__unused RCTBridge *)bridge
+{
+  return nil;
+}
+
+- (NSArray *)extraModulesForBridge:(__unused RCTBridge *)bridge
+{
+  return @[_notificationObserver];
+}
+
+- (void)setUp
+{
+  [super setUp];
+
+  _notificationObserver = [RCTNotificationObserverModule new];
+  _bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:nil];
+}
+
+- (void)tearDown
+{
+  [super tearDown];
+
+  _notificationObserver = nil;
+  id<RCTJavaScriptExecutor> jsExecutor = _bridge.batchedBridge.javaScriptExecutor;
+  [_bridge invalidate];
+  RUN_RUNLOOP_WHILE(jsExecutor.isValid);
+  _bridge = nil;
+}
+
+- (void)testViewManagerNotInitializedBeforeSetBridgeModule
+{
+  RUN_RUNLOOP_WHILE(!_notificationObserver.didDetectViewManagerInit);
+}
+
+@end

Examples/UIExplorer/UIExplorerUnitTests/RCTModuleInitTests.m

@@ -0,0 +1,254 @@
+/**
+ * The examples provided by Facebook are for non-commercial testing and
+ * evaluation purposes only.
+ *
+ * Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import <Foundation/Foundation.h>
+#import <XCTest/XCTest.h>
+
+#import "RCTBridge.h"
+#import "RCTBridge+Private.h"
+#import "RCTBridgeModule.h"
+#import "RCTUtils.h"
+
+#define RUN_RUNLOOP_WHILE(CONDITION) \
+{ \
+  NSDate *timeout = [NSDate dateWithTimeIntervalSinceNow:5]; \
+  while ((CONDITION)) { \
+    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1]]; \
+    if ([timeout timeIntervalSinceNow] <= 0) { \
+      XCTFail(@"Runloop timed out before condition was met"); \
+      break; \
+    } \
+  } \
+}
+
+
+@interface RCTTestInjectedModule : NSObject <RCTBridgeModule>
+@end
+
+@implementation RCTTestInjectedModule
+
+@synthesize bridge = _bridge;
+@synthesize methodQueue = _methodQueue;
+
+RCT_EXPORT_MODULE()
+
+@end
+
+
+@interface RCTTestCustomInitModule : NSObject <RCTBridgeModule>
+
+@property (nonatomic, assign) BOOL initializedOnMainThread;
+
+@end
+
+@implementation RCTTestCustomInitModule
+
+@synthesize bridge = _bridge;
+@synthesize methodQueue = _methodQueue;
+
+RCT_EXPORT_MODULE()
+
+- (id)init
+{
+  if ((self = [super init])) {
+    _initializedOnMainThread = [NSThread isMainThread];
+  }
+  return self;
+}
+
+@end
+
+
+@interface RCTTestCustomSetBridgeModule : NSObject <RCTBridgeModule>
+
+@property (nonatomic, assign) BOOL setBridgeOnMainThread;
+
+@end
+
+@implementation RCTTestCustomSetBridgeModule
+
+@synthesize bridge = _bridge;
+@synthesize methodQueue = _methodQueue;
+
+RCT_EXPORT_MODULE()
+
+- (void)setBridge:(RCTBridge *)bridge
+{
+  _bridge = bridge;
+  _setBridgeOnMainThread = [NSThread isMainThread];
+}
+
+@end
+
+
+@interface RCTTestExportConstantsModule : NSObject <RCTBridgeModule>
+
+@property (nonatomic, assign) BOOL exportedConstants;
+@property (nonatomic, assign) BOOL exportedConstantsOnMainThread;
+
+@end
+
+@implementation RCTTestExportConstantsModule
+
+@synthesize bridge = _bridge;
+@synthesize methodQueue = _methodQueue;
+
+RCT_EXPORT_MODULE()
+
+- (NSDictionary<NSString *, id> *)constantsToExport
+{
+  _exportedConstants = YES;
+  _exportedConstantsOnMainThread = [NSThread isMainThread];
+  return @{ @"foo": @"bar" };
+}
+
+@end
+
+
+@interface RCTLazyInitModule : NSObject <RCTBridgeModule>
+@end
+
+@implementation RCTLazyInitModule
+
+@synthesize bridge = _bridge;
+@synthesize methodQueue = _methodQueue;
+
+RCT_EXPORT_MODULE()
+
+@end
+
+
+@interface RCTModuleInitTests : XCTestCase <RCTBridgeDelegate>
+{
+  RCTBridge *_bridge;
+  BOOL _injectedModuleInitNotificationSent;
+  BOOL _customInitModuleNotificationSent;
+  BOOL _customSetBridgeModuleNotificationSent;
+  BOOL _exportConstantsModuleNotificationSent;
+  BOOL _lazyInitModuleNotificationSent;
+  BOOL _lazyInitModuleNotificationSentOnMainThread;
+  BOOL _viewManagerModuleNotificationSent;
+  RCTTestInjectedModule *_injectedModule;
+}
+@end
+
+@implementation RCTModuleInitTests
+
+- (NSURL *)sourceURLForBridge:(__unused RCTBridge *)bridge
+{
+  return nil;
+}
+
+- (NSArray *)extraModulesForBridge:(__unused RCTBridge *)bridge
+{
+  return @[_injectedModule];
+}
+
+- (void)setUp
+{
+  [super setUp];
+
+  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moduleDidInit:) name:RCTDidInitializeModuleNotification object:nil];
+
+  _injectedModuleInitNotificationSent = NO;
+  _customInitModuleNotificationSent = NO;
+  _customSetBridgeModuleNotificationSent = NO;
+  _exportConstantsModuleNotificationSent = NO;
+  _lazyInitModuleNotificationSent = NO;
+  _viewManagerModuleNotificationSent = NO;
+  _injectedModule = [RCTTestInjectedModule new];
+  _bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:nil];
+}
+
+- (void)tearDown
+{
+  [super tearDown];
+
+  [[NSNotificationCenter defaultCenter] removeObserver:self name:RCTDidInitializeModuleNotification object:nil];
+
+  id<RCTJavaScriptExecutor> jsExecutor = _bridge.batchedBridge.javaScriptExecutor;
+  [_bridge invalidate];
+  RUN_RUNLOOP_WHILE(jsExecutor.isValid);
+  _bridge = nil;
+}
+
+- (void)moduleDidInit:(NSNotification *)note
+{
+  id<RCTBridgeModule> module = note.userInfo[@"module"];
+  if ([module isKindOfClass:[RCTTestInjectedModule class]]) {
+    _injectedModuleInitNotificationSent = YES;
+  } else if ([module isKindOfClass:[RCTTestCustomInitModule class]]) {
+    _customInitModuleNotificationSent = YES;
+  } else if ([module isKindOfClass:[RCTTestCustomSetBridgeModule class]]) {
+    _customSetBridgeModuleNotificationSent = YES;
+  } else if ([module isKindOfClass:[RCTTestExportConstantsModule class]]) {
+    _exportConstantsModuleNotificationSent = YES;
+  } else if ([module isKindOfClass:[RCTLazyInitModule class]]) {
+    _lazyInitModuleNotificationSent = YES;
+    _lazyInitModuleNotificationSentOnMainThread = [NSThread isMainThread];
+  }
+}
+
+- (void)testInjectedModulesInitializedDuringBridgeInit
+{
+  XCTAssertTrue(_injectedModuleInitNotificationSent);
+  XCTAssertEqual(_injectedModule, [_bridge moduleForClass:[RCTTestInjectedModule class]]);
+  XCTAssertEqual(_injectedModule.bridge, _bridge.batchedBridge);
+  XCTAssertNotNil(_injectedModule.methodQueue);
+}
+
+- (void)testCustomInitModuleInitializedAtBridgeStartup
+{
+  RUN_RUNLOOP_WHILE(!_customInitModuleNotificationSent);
+  XCTAssertTrue(_customInitModuleNotificationSent);
+  RCTTestCustomInitModule *module = [_bridge moduleForClass:[RCTTestCustomInitModule class]];
+  XCTAssertTrue(module.initializedOnMainThread);
+}
+
+- (void)testCustomSetBridgeModuleInitializedAtBridgeStartup
+{
+  RUN_RUNLOOP_WHILE(!_customSetBridgeModuleNotificationSent);
+  XCTAssertTrue(_customSetBridgeModuleNotificationSent);
+  RCTTestCustomSetBridgeModule *module = [_bridge moduleForClass:[RCTTestCustomSetBridgeModule class]];
+  XCTAssertTrue(module.setBridgeOnMainThread);
+}
+
+- (void)testExportConstantsModuleInitializedAtBridgeStartup
+{
+  RUN_RUNLOOP_WHILE(!_exportConstantsModuleNotificationSent);
+  XCTAssertTrue(_exportConstantsModuleNotificationSent);
+  RCTTestExportConstantsModule *module = [_bridge moduleForClass:[RCTTestExportConstantsModule class]];
+  RUN_RUNLOOP_WHILE(!module.exportedConstants);
+  XCTAssertTrue(module.exportedConstants);
+  XCTAssertTrue(module.exportedConstantsOnMainThread);
+}
+
+- (void)testLazyInitModuleNotInitializedDuringBridgeInit
+{
+  XCTAssertFalse(_lazyInitModuleNotificationSent);
+
+  __block RCTLazyInitModule *module;
+  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+    module = [_bridge moduleForClass:[RCTLazyInitModule class]];
+  });
+
+  RUN_RUNLOOP_WHILE(!module);
+  XCTAssertTrue(_lazyInitModuleNotificationSent);
+  XCTAssertFalse(_lazyInitModuleNotificationSentOnMainThread);
+  XCTAssertNotNil(module);
+  XCTAssertEqual(module.bridge, _bridge.batchedBridge);
+  XCTAssertNotNil(module.methodQueue);
+}
+
+@end

React/Base/RCTBatchedBridge.m

@@ -44,6 +44,7 @@ RCT_EXTERN NSArray<Class> *RCTGetModuleClasses(void);
 @interface RCTBatchedBridge : RCTBridge
 
 @property (nonatomic, weak) RCTBridge *parentBridge;
+@property (nonatomic, weak) id<RCTJavaScriptExecutor> javaScriptExecutor;
 
 @end
 
@@ -52,7 +53,6 @@ RCT_EXTERN NSArray<Class> *RCTGetModuleClasses(void);
   BOOL _loading;
   BOOL _valid;
   BOOL _wasBatchActive;
-  __weak id<RCTJavaScriptExecutor> _javaScriptExecutor;
   NSMutableArray<dispatch_block_t> *_pendingCalls;
   NSMutableDictionary<NSString *, RCTModuleData *> *_moduleDataByName;
   NSArray<RCTModuleData *> *_moduleDataByID;

React/Base/RCTBridge+Private.h

@@ -54,6 +54,11 @@
 
 @interface RCTBridge (RCTBatchedBridge)
 
+/**
+ * Used for unit testing, to detect when executor has been invalidated.
+ */
+@property (nonatomic, weak, readonly) id<RCTJavaScriptExecutor> javaScriptExecutor;
+
 /**
  * Used by RCTModuleData to register the module for frame updates after it is
  * lazily initialized.

React/Base/RCTBridge.m

@@ -68,7 +68,8 @@ void RCTRegisterModule(Class moduleClass)
 NSString *RCTBridgeModuleNameForClass(Class cls)
 {
 #if RCT_DEV
-  RCTAssert([cls conformsToProtocol:@protocol(RCTBridgeModule)], @"Bridge module classes must conform to RCTBridgeModule");
+  RCTAssert([cls conformsToProtocol:@protocol(RCTBridgeModule)],
+            @"Bridge module `%@` does not conform to RCTBridgeModule", cls);
 #endif
 
   NSString *name = [cls moduleName];
@@ -104,34 +105,33 @@ dispatch_queue_t RCTJSThread;
     // Set up JS thread
     RCTJSThread = (id)kCFNull;
 
-#if RCT_DEBUG
+    if (RCT_DEBUG && !RCTRunningInTestEnvironment()) {
 
-    // Set up module classes
+      // Set up module classes
-    static unsigned int classCount;
+      static unsigned int classCount;
-    Class *classes = objc_copyClassList(&classCount);
+      Class *classes = objc_copyClassList(&classCount);
 
-    for (unsigned int i = 0; i < classCount; i++)
+      for (unsigned int i = 0; i < classCount; i++)
-    {
-      Class cls = classes[i];
-      Class superclass = cls;
-      while (superclass)
       {
-        if (class_conformsToProtocol(superclass, @protocol(RCTBridgeModule)))
+        Class cls = classes[i];
+        Class superclass = cls;
+        while (superclass)
         {
-          if (![RCTModuleClasses containsObject:cls]) {
+          if (class_conformsToProtocol(superclass, @protocol(RCTBridgeModule)))
-            RCTLogWarn(@"Class %@ was not exported. Did you forget to use "
+          {
-                       "RCT_EXPORT_MODULE()?", cls);
+            if (![RCTModuleClasses containsObject:cls]) {
+              RCTLogWarn(@"Class %@ was not exported. Did you forget to use "
+                         "RCT_EXPORT_MODULE()?", cls);
+            }
+            break;
           }
-          break;
+          superclass = class_getSuperclass(superclass);
         }
-        superclass = class_getSuperclass(superclass);
       }
+
+      free(classes);
+
     }
-
-    free(classes);
-
-#endif
-
   });
 }
 

React/Base/RCTLog.m

@@ -16,6 +16,7 @@
 #import "RCTBridge+Private.h"
 #import "RCTDefines.h"
 #import "RCTRedBox.h"
+#import "RCTUtils.h"
 
 static NSString *const RCTLogFunctionStack = @"RCTLogFunctionStack";
 
@@ -226,8 +227,10 @@ void _RCTLogNativeInternal(RCTLogLevel level, const char *fileName, int lineNumb
       });
     }
 
-    // Log to JS executor
+    if (!RCTRunningInTestEnvironment()) {
-    [[RCTBridge currentBridge] logMessage:message level:level ? @(RCTLogLevels[level]) : @"info"];
+      // Log to JS executor
+      [[RCTBridge currentBridge] logMessage:message level:level ? @(RCTLogLevels[level]) : @"info"];
+    }
 
 #endif
 

React/Base/RCTModuleData.m

@@ -238,4 +238,9 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init);
   _methodQueue = nil;
 }
 
+- (NSString *)description
+{
+  return [NSString stringWithFormat:@"<%@: %p; name=\"%@\">", [self class], self, self.name];
+}
+
 @end

React/Modules/RCTDevMenu.m

@@ -369,7 +369,7 @@ RCT_EXPORT_MODULE()
   if (!sourceCodeModule.scriptURL) {
     if (!sourceCodeModule) {
       RCTLogWarn(@"RCTSourceCode module not found");
-    } else {
+    } else if (!RCTRunningInTestEnvironment()) {
       RCTLogWarn(@"RCTSourceCode module scriptURL has not been set");
     }
   } else if (!sourceCodeModule.scriptURL.fileURL) {