Move iOS tests to XCTest from gtest.

webrtc/examples/objc/AppRTCMobile/tests/ARDSDPUtils_xctest.mm

+/*
+ *  Copyright 2017 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import <Foundation/Foundation.h>
+#import <XCTest/XCTest.h>
+
+#import "WebRTC/RTCSessionDescription.h"
+
+#import "ARDSDPUtils.h"
+
+@interface ARDSDPUtilsTest : XCTestCase
+@end
+
+@implementation ARDSDPUtilsTest
+
+- (void)testPreferVideoCodecH264 {
+  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\n"
+                    "a=rtpmap:120 H264/90000\n"
+                    "a=rtpmap:97 H264/90000\n");
+  NSString *expectedSdp = @("m=video 9 RTP/SAVPF 120 97 100 116 117 96\n"
+                            "a=rtpmap:120 H264/90000\n"
+                            "a=rtpmap:97 H264/90000\n");
+  [self preferVideoCodec:@"H264" sdp:sdp expected:expectedSdp];
+}
+
+- (void)testPreferVideoCodecVP8 {
+  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\n"
+                    "a=rtpmap:116 VP8/90000\n");
+  NSString *expectedSdp = @("m=video 9 RTP/SAVPF 116 100 117 96 120 97\n"
+                            "a=rtpmap:116 VP8/90000\n");
+  [self preferVideoCodec:@"VP8" sdp:sdp expected:expectedSdp];
+}
+
+- (void)testNoMLine {
+  NSString *sdp = @("a=rtpmap:116 VP8/90000\n");
+  [self preferVideoCodec:@"VP8" sdp:sdp expected:sdp];
+}
+
+- (void)testMissingCodec {
+  NSString *sdp = @("m=video 9 RTP/SAVPF 100 116 117 96 120 97\n"
+                    "a=rtpmap:116 VP8/90000\n");
+  [self preferVideoCodec:@"foo" sdp:sdp expected:sdp];
+}
+
+#pragma mark - Helpers
+
+- (void)preferVideoCodec:(NSString *)codec
+                     sdp:(NSString *)sdp
+                expected:(NSString *)expectedSdp{
+  RTCSessionDescription* desc =
+    [[RTCSessionDescription alloc] initWithType:RTCSdpTypeOffer sdp:sdp];
+  RTCSessionDescription *outputDesc =
+    [ARDSDPUtils descriptionForDescription:desc
+                       preferredVideoCodec:codec];
+  XCTAssertTrue([outputDesc.description rangeOfString:expectedSdp].location != NSNotFound);
+}
+@end