[ReactKit] Create test for OSS ReactKit

Examples/UIExplorer/UIExplorerTests/UIExplorerTests.m

@@ -0,0 +1,50 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#import <UIKit/UIKit.h>
+#import <XCTest/XCTest.h>
+
+@interface UIExplorerTests : XCTestCase
+
+@end
+
+@implementation UIExplorerTests
+
+- (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)testRootViewLoadsAndRenders {
+  UIViewController *vc = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
+
+  NSDate *date = [NSDate dateWithTimeIntervalSinceNow:5];
+  BOOL foundElement = NO;
+
+  while ([date timeIntervalSinceNow] > 0 && !foundElement) {
+    [[NSRunLoop mainRunLoop] runMode:NSDefaultRunLoopMode beforeDate:date];
+    [[NSRunLoop mainRunLoop] runMode:NSRunLoopCommonModes beforeDate:date];
+
+    foundElement = [self findSubviewInView:vc.view matching:^BOOL(UIView *view) {
+      if ([view respondsToSelector:@selector(attributedText)]) {
+        NSString *text = [(id)view attributedText].string;
+        if ([text isEqualToString:@"<View>"]) {
+          return YES;
+        }
+      }
+      return NO;
+    }];
+  }
+
+  XCTAssertTrue(foundElement, @"Cound't find element with '<View>' text in 5 seconds");
+}
+
+
+@end