1 files changed, 57 insertions, 0 deletions
diff --git a/Example/Database/Tests/Helpers/SenTest+FWaiter.m b/Example/Database/Tests/Helpers/SenTest+FWaiter.m
new file mode 100644
index 0000000..4c5c854
--- /dev/null
+++ b/Example/Database/Tests/Helpers/SenTest+FWaiter.m
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "SenTest+FWaiter.h"
+#import "FTestContants.h"
+
+@implementation XCTestCase (FWaiter)
+
+- (NSTimeInterval) waitUntil:(BOOL (^)())predicate {
+    return [self waitUntil:predicate timeout:kFirebaseTestWaitUntilTimeout description:nil];
+}
+
+- (NSTimeInterval) waitUntil:(BOOL (^)())predicate description:(NSString*)desc {
+    return [self waitUntil:predicate timeout:kFirebaseTestWaitUntilTimeout description:desc];
+}
+
+- (NSTimeInterval) waitUntil:(BOOL (^)())predicate timeout:(NSTimeInterval)seconds {
+    return [self waitUntil:predicate timeout:seconds description:nil];
+}
+
+- (NSTimeInterval) waitUntil:(BOOL (^)())predicate timeout:(NSTimeInterval)seconds description:(NSString*)desc {
+    NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate];
+    NSDate *timeoutDate = [NSDate dateWithTimeIntervalSinceNow:seconds];
+    NSTimeInterval timeoutTime = [timeoutDate timeIntervalSinceReferenceDate];
+    NSTimeInterval currentTime;
+    
+    for (currentTime = [NSDate timeIntervalSinceReferenceDate];
+         !predicate() && currentTime < timeoutTime;
+         currentTime = [NSDate timeIntervalSinceReferenceDate]) {
+        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.25]];
+    }
+        
+    NSTimeInterval finish = [NSDate timeIntervalSinceReferenceDate];
+    if (currentTime > timeoutTime) {
+        if (desc != nil) {
+            XCTFail("Timed out on: %@", desc);
+        } else {
+            XCTFail("Timed out");
+        }
+    }
+    return (finish - start);
+}
+
+@end