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diff --git a/xcode/OLMKitTests/OLMKitSASTests.m b/xcode/OLMKitTests/OLMKitSASTests.m
new file mode 100644
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+++ b/xcode/OLMKitTests/OLMKitSASTests.m
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+/*
+ Copyright 2019 New Vector Ltd
+
+ 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 <XCTest/XCTest.h>
+#import <OLMKit/OLMKit.h>
+
+@interface OLMKitSASTests : XCTestCase {
+    OLMSAS *alice;
+    OLMSAS *bob;
+}
+
+@end
+
+@implementation OLMKitSASTests
+
+- (void)setUp {
+    alice = [OLMSAS new];
+    bob = [OLMSAS new];
+}
+
+- (void)tearDown {
+    alice = nil;
+    bob = nil;
+}
+
+- (void)testSASRandomness
+{
+    XCTAssertNotEqualObjects(alice.publicKey, bob.publicKey);
+}
+
+- (void)testSASBytesMatch {
+    [alice setTheirPublicKey:bob.publicKey];
+    [bob setTheirPublicKey:alice.publicKey];
+
+    NSString *sas = @"SAS";
+    NSUInteger length = 5;
+
+    XCTAssertEqualObjects([alice generateBytes:sas length:length],
+                          [bob generateBytes:sas length:length]);
+}
+
+- (void)testMACsMatch {
+    [alice setTheirPublicKey:bob.publicKey];
+    [bob setTheirPublicKey:alice.publicKey];
+
+    NSString *string = @"test";
+    NSString *info = @"MAC";
+
+    NSError *aliceError, *bobError;
+    XCTAssertEqualObjects([alice calculateMac:string info:info error:&aliceError],
+                          [bob calculateMac:string info:info error:&bobError]);
+    XCTAssertNil(aliceError);
+    XCTAssertNil(bobError);
+}
+
+- (void)testMACLongKdfsMatch {
+    [alice setTheirPublicKey:bob.publicKey];
+    [bob setTheirPublicKey:alice.publicKey];
+
+    NSString *string = @"test";
+    NSString *info = @"MAC";
+
+    NSError *aliceError, *bobError;
+    XCTAssertEqualObjects([alice calculateMacLongKdf:string info:info error:&aliceError],
+                          [bob calculateMacLongKdf:string info:info error:&bobError]);
+    XCTAssertNotEqualObjects([alice calculateMacLongKdf:string info:info error:&aliceError],
+                             [bob calculateMac:string info:info error:&bobError]);
+    XCTAssertNil(aliceError);
+    XCTAssertNil(bobError);
+}
+
+
+@end