message: fix test - _isNewUser to isNewUser
diff: @@ -73,7 +73,7 @@ export class PropertiesTests extends TestClass {
  instrumentationKey: 'key',
  extensionConfig: {}
  }, this.core, []);
  - this.properties.context.user._isNewUser = false;
  + this.properties.context.user.isNewUser = false;
  // Act
  const item: ITelemetryItem = {name: 'item'};
  this.properties.processTelemetry(item);
  @@ -117,12 +117,12 @@ export class PropertiesTests extends TestClass {
  Assert.ok(setCookieStub.called, 'Cookie generated');
  // Assert
  - Assert.equal(true, this.properties.context.user._isNewUser, 'current user is a new user');
  + Assert.equal(true, this.properties.context.user.isNewUser, 'current user is a new user');
  const item: ITelemetryItem = {name: 'item'};
  this.properties.processTelemetry(item);
  // this.clock.tick(1000);
  Assert.ok(loggingStub.called, 'logInternalMessage is triggered');
  - Assert.equal(false, this.properties.context.user._isNewUser, 'current user is not new user with ai_user cookie set')
  + Assert.equal(false, this.properties.context.user.isNewUser, 'current user is not new user with ai_user cookie set')
  }
  });
  