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diff --git a/Example/Database/Tests/Helpers/FTupleEventTypeString.m b/Example/Database/Tests/Helpers/FTupleEventTypeString.m
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+++ b/Example/Database/Tests/Helpers/FTupleEventTypeString.m
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+/*
+ * 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 "FTupleEventTypeString.h"
+
+@implementation FTupleEventTypeString
+
+@synthesize firebase;
+@synthesize eventType;
+@synthesize string;
+@synthesize vvcallback;
+@synthesize initialized;
+
+- (id)initWithFirebase:(FIRDatabaseReference *)f withEvent:(FIRDataEventType)evt withString:(NSString *)str;
+{
+    self = [super init];
+    if (self) {
+        self.firebase = f;
+        self.eventType = evt;
+        self.string = str;
+        self.initialized = NO;
+    }
+    return self;
+}
+
+- (NSString *) description {
+    return [NSString stringWithFormat:@"%@ %@ (%zd)", self.firebase, self.string, self.eventType];
+}
+
+- (BOOL) isEqualTo:(FTupleEventTypeString *)other {
+    BOOL stringsEqual = NO;
+    if (self.string == nil && other.string == nil) {
+        stringsEqual = YES;
+    } else if (self.string != nil && other.string != nil) {
+        stringsEqual = [self.string isEqualToString:other.string];
+    }
+    return self.eventType == other.eventType && stringsEqual && [[self.firebase description] isEqualToString:[other.firebase description]];
+}
+
+@end