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diff --git a/Firestore/Example/Tests/Remote/FSTDatastoreTests.mm b/Firestore/Example/Tests/Remote/FSTDatastoreTests.mm
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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 "Firestore/Source/Remote/FSTDatastore.h"
+
+#import <FirebaseFirestore/FIRFirestoreErrors.h>
+#import <GRPCClient/GRPCCall.h>
+#import <XCTest/XCTest.h>
+
+@interface FSTDatastoreTests : XCTestCase
+@end
+
+@implementation FSTDatastoreTests
+
+- (void)testIsPermanentWriteError {
+  // From GRPCCall -cancel
+  NSError *error = [NSError errorWithDomain:FIRFirestoreErrorDomain
+                                       code:FIRFirestoreErrorCodeCancelled
+                                   userInfo:@{NSLocalizedDescriptionKey : @"Canceled by app"}];
+  XCTAssertFalse([FSTDatastore isPermanentWriteError:error]);
+
+  // From GRPCCall -startNextRead
+  error =
+      [NSError errorWithDomain:FIRFirestoreErrorDomain
+                          code:FIRFirestoreErrorCodeResourceExhausted
+                      userInfo:@{
+                        NSLocalizedDescriptionKey :
+                            @"Client does not have enough memory to hold the server response."
+                      }];
+  XCTAssertFalse([FSTDatastore isPermanentWriteError:error]);
+
+  // From GRPCCall -startWithWriteable
+  error = [NSError errorWithDomain:FIRFirestoreErrorDomain
+                              code:FIRFirestoreErrorCodeUnavailable
+                          userInfo:@{NSLocalizedDescriptionKey : @"Connectivity lost."}];
+  XCTAssertFalse([FSTDatastore isPermanentWriteError:error]);
+
+  // User info doesn't matter:
+  error = [NSError errorWithDomain:FIRFirestoreErrorDomain
+                              code:FIRFirestoreErrorCodeUnavailable
+                          userInfo:nil];
+  XCTAssertFalse([FSTDatastore isPermanentWriteError:error]);
+}
+
+@end