Trace loggging: Check for g_event_logger is not null before calling it.

webrtc/sdk/objc/Framework/UnitTests/RTCPeerConnectionTest.mm

Index: webrtc/sdk/objc/Framework/UnitTests/RTCPeerConnectionTest.mm
diff --git a/webrtc/sdk/objc/Framework/UnitTests/RTCPeerConnectionTest.mm b/webrtc/sdk/objc/Framework/UnitTests/RTCPeerConnectionTest.mm
index 1797feabce077143a3a7615e8da534c3f2bedc24..9b7ac97a0bd6743a2f32e7e767ed24a581f300e7 100644
--- a/webrtc/sdk/objc/Framework/UnitTests/RTCPeerConnectionTest.mm
+++ b/webrtc/sdk/objc/Framework/UnitTests/RTCPeerConnectionTest.mm
@@ -21,9 +21,11 @@
 #import "WebRTC/RTCPeerConnectionFactory.h"
 #import "WebRTC/RTCIceServer.h"
 #import "WebRTC/RTCMediaConstraints.h"
+#import "WebRTC/RTCTracing.h"
 
 @interface RTCPeerConnectionTest : NSObject
 - (void)testConfigurationGetter;
+- (void)tracingTestNoInitialization;

[tkchin_webrtc, 2017/06/27 22:56:40]

This shouldn't belong in RTCPeerConnectionTest.
Write a new UT class/file for RTCTracing instead.

 @end
 
 @implementation RTCPeerConnectionTest
@@ -81,6 +83,21 @@
   EXPECT_EQ(config.shouldPruneTurnPorts, newConfig.shouldPruneTurnPorts);
 }
 
+- (NSString *)documentsFilePathForFileName:(NSString *)fileName {
+  NSParameterAssert(fileName.length);
+  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
+  NSString *documentsDirPath = paths.firstObject;
+  NSString *filePath =
+  [documentsDirPath stringByAppendingPathComponent:fileName];
+  return filePath;
+}
+
+- (void)tracingTestNoInitialization {
+  NSString *filePath = [self documentsFilePathForFileName:@"webrtc-trace.txt"];
+  EXPECT_EQ(NO, RTCStartInternalCapture(filePath));
+  RTCStopInternalCapture();
+}
+
 @end
 
 TEST(RTCPeerConnectionTest, ConfigurationGetterTest) {
@@ -90,4 +107,10 @@ TEST(RTCPeerConnectionTest, ConfigurationGetterTest) {
   }
 }
 
+TEST(RTCPeerConnectionTest, TracingTestNoInitialization) {
+  @autoreleasepool {
+    RTCPeerConnectionTest *test = [[RTCPeerConnectionTest alloc] init];
+    [test tracingTestNoInitialization];
+  }
+}