Add test target to SampleApp

Examples/SampleApp/SampleAppTests/SampleAppTests.m

@@ -0,0 +1,68 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import <UIKit/UIKit.h>
+#import <XCTest/XCTest.h>
+
+#import "RCTAssert.h"
+#import "RCTRedBox.h"
+#import "RCTRootView.h"
+
+#define TIMEOUT_SECONDS 240
+#define TEXT_TO_LOOK_FOR @"Welcome to React Native!"
+
+@interface SampleAppTests : XCTestCase
+
+@end
+
+@implementation SampleAppTests
+
+
+- (BOOL)findSubviewInView:(UIView *)view matching:(BOOL(^)(UIView *view))test
+{
+  if (test(view)) {
+    return YES;
+  }
+  for (UIView *subview in [view subviews]) {
+    if ([self findSubviewInView:subview matching:test]) {
+      return YES;
+    }
+  }
+  return NO;
+}
+
+- (void)testRendersWelcomeScreen {
+  UIViewController *vc = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
+  NSDate *date = [NSDate dateWithTimeIntervalSinceNow:TIMEOUT_SECONDS];
+  BOOL foundElement = NO;
+  NSString *redboxError = nil;
+
+  while ([date timeIntervalSinceNow] > 0 && !foundElement && !redboxError) {
+    [[NSRunLoop mainRunLoop] runMode:NSDefaultRunLoopMode beforeDate:date];
+    [[NSRunLoop mainRunLoop] runMode:NSRunLoopCommonModes beforeDate:date];
+
+    redboxError = [[RCTRedBox sharedInstance] currentErrorMessage];
+
+    foundElement = [self findSubviewInView:vc.view matching:^BOOL(UIView *view) {
+      if ([view respondsToSelector:@selector(attributedText)]) {
+        NSString *text = [(id)view attributedText].string;
+        if ([text isEqualToString:TEXT_TO_LOOK_FOR]) {
+          return YES;
+        }
+      }
+      return NO;
+    }];
+  }
+
+  XCTAssertNil(redboxError, @"RedBox error: %@", redboxError);
+  XCTAssertTrue(foundElement, @"Cound't find element with text '%@' in %d seconds", TEXT_TO_LOOK_FOR, TIMEOUT_SECONDS);
+}
+
+
+@end