fix issue 730. (#732)

Author: cloudwebrtc

example/lib/pages/connect.dart

@@ -38,7 +38,7 @@ class _ConnectPageState extends State<ConnectPage> {
   bool _busy = false;
   bool _e2ee = false;
   bool _multiCodec = false;
-  String _preferredCodec = 'Preferred Codec';
+  String _preferredCodec = 'VP8';
 
   @override
   void initState() {

lib/src/support/platform.dart

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import 'dart:io';
-
 import 'platform/io.dart' if (dart.library.js_interop) 'platform/web.dart';
 
 // Returns the current platform which works for both web and devices.
@@ -29,12 +27,12 @@ bool lkPlatformIsWebMobile() => lkPlatformIsWebMobileImplementation();
 bool lkPlatformIsDesktop() => [
       PlatformType.macOS,
       PlatformType.windows,
-      PlatformType.linux
+      PlatformType.linux,
     ].contains(lkPlatform());
 
 bool lkPlatformSupportsE2EE() => lkE2EESupportedImplementation();
 
-bool lkPlatformIsTest() => Platform.environment.containsKey('FLUTTER_TEST');
+bool lkPlatformIsTest() => lkPlatformIsTestImplementation();
 
 BrowserType lkBrowser() => lkBrowserImplementation();
 
@@ -47,15 +45,7 @@ bool skipStopForTrackMute() =>
     (lkPlatformIs(PlatformType.web) &&
         [BrowserType.firefox].contains(lkBrowser()));
 
-enum PlatformType {
-  web,
-  windows,
-  linux,
-  macOS,
-  android,
-  fuchsia,
-  iOS,
-}
+enum PlatformType { web, windows, linux, macOS, android, fuchsia, iOS }
 
 enum BrowserType {
   chrome,

lib/src/support/platform/io.dart

@@ -30,6 +30,9 @@ bool lkPlatformIsWebMobileImplementation() {
   return false;
 }
 
+bool lkPlatformIsTestImplementation() =>
+    Platform.environment.containsKey('FLUTTER_TEST');
+
 bool lkE2EESupportedImplementation() {
   return [
     PlatformType.windows,

lib/src/support/platform/web.dart

@@ -32,6 +32,8 @@ bool lkE2EESupportedImplementation() {
   return isInsertableStreamSupported() || isScriptTransformSupported();
 }
 
+bool lkPlatformIsTestImplementation() => false;
+
 bool isScriptTransformSupported() {
   return web.window
       .hasProperty('RTCRtpScriptTransform'.toJS)
@@ -40,8 +42,9 @@ bool isScriptTransformSupported() {
 
 bool isInsertableStreamSupported() {
   return web.window.hasProperty('RTCRtpSender'.toJS).isDefinedAndNotNull &&
-      ((web.window.getProperty('RTCRtpSender'.toJS) as JSObject)
-              .getProperty('prototype'.toJS) as JSObject)
+      ((web.window.getProperty('RTCRtpSender'.toJS) as JSObject).getProperty(
+        'prototype'.toJS,
+      ) as JSObject)
           .getProperty('createEncodedStreams'.toJS)
           .isDefinedAndNotNull;
 }