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
+- (void)testPreferVideoCodecH264;

[daniela-webrtc, 2017/02/13 16:08:22]

nit: We could probably ditch the declaration of test methods. IMO they add
little value to the code, they are not required by the compiler and are tough to
maintain when adding new tests.

[kjellander_webrtc, 2017/02/14 09:04:10]

Fine with me. If they don't provide any value I don't see why we would have
them. 

[kthelgason, 2017/02/14 09:48:46]

Done.

+- (void)testPreferVideoCodecVP8;
+- (void)testNoMLine;
+- (void)testMissingCodec;
+@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