Visual Studio 2015 Unit Test Inconsistency

I am receiving inconsistent unit test results after moving to VS2015 after being on VS2013. On VS2013, the unit tests were consistently passing. In VS2015, the unit tests fail if all are run at once or it is an automated Jenkins build. If the unit tests are individually run or all the failed tests are run at once, they pass.

This may be an EF6 issue. The error message I receive when all tests are run is...

Test Name: GetQuoteService_NoExceptions Test FullName: MEA.SmartApp.Business.Factories.APV.UnitTests.QuoteFactoryTest.GetQuoteService_NoExceptions Test Source: C:\MetLife_Sourcecode\Common\DEV2\MEA.Smartapp.Common\Unit Tests\MEA.SmartApp.Business.Factories.APV.UnitTests\QuoteFactoryTest.cs : line 15 Test Outcome: Failed Test Duration: 0:00:00.00737

Result StackTrace:
at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName) at System.Data.Entity.Internal.AppConfig.<.ctor>b__2(ProviderElement e) at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext() at System.Collections.Generic.List1..ctor(IEnumerable1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source) at System.Data.Entity.Internal.AppConfig.<.ctor>b__1() at System.Lazy1.CreateValue() at System.Lazy1.LazyInitValue() at System.Lazy1.get_Value() at System.Data.Entity.Internal.AppConfig.get_DbProviderServices() at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.RegisterDbProviderServices() at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetServiceFactory(Type type, String name) at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.<>c__DisplayClass1.<GetService>b__0(Tuple2 t) at System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory) at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetService(Type type, Object key) at System.Data.Entity.Infrastructure.DependencyResolution.DbDependencyResolverExtensions.GetServiceAsServices(IDbDependencyResolver resolver, Type type, Object key) at System.Data.Entity.Infrastructure.DependencyResolution.AppConfigDependencyResolver.GetServices(Type type, Object key) at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.<>c__DisplayClass6.b__5(IDbDependencyResolver r) at System.Linq.Enumerable.d__12.MoveNext() at System.Linq.Enumerable.<ConcatIterator>d__11.MoveNext() at System.Linq.Enumerable.d__11.MoveNext() at System.Data.Entity.Utilities.IEnumerableExtensions.Each[T](IEnumerable1 ts, Action1 action) at System.Data.Entity.Infrastructure.DependencyResolution.InternalConfiguration.Lock() at System.Data.Entity.Infrastructure.DependencyResolution.DbConfigurationManager.<.ctor>b__1() at System.Lazy1.CreateValue() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Lazy`1.get_Value() at System.Data.Entity.Infrastructure.DependencyResolution.DbConfigurationManager.GetConfiguration() at System.Data.Entity.DbContext.InitializeLazyInternalContext(IInternalConnection internalConnection, DbCompiledModel model) at System.Data.Entity.DbContext..ctor(String nameOrConnectionString) at MEA.SmartApp.Contexts.APV.AVMDB..ctor() in C:\MetLife_Sourcecode\Common\DEV2\MEA.Smartapp.Common\DataAccessLayer\MEA.SmartApp.Contexts.APV\AVMDB.Context.cs:line 19 at MEA.SmartApp.Business.Factories.APV.QuoteFactory.GetAvmBusinessService() in C:\MetLife_Sourcecode\Common\DEV2\MEA.Smartapp.Common\BusinessLogicLayer\MEA.SmartApp.Business.Factories.APV\QuoteFactory.cs:line 65 at MEA.SmartApp.Business.Factories.APV.QuoteFactory.GetQuoteService(APVTransactionCode transactionCode) in C:\MetLife_Sourcecode\Common\DEV2\MEA.Smartapp.Common\BusinessLogicLayer\MEA.SmartApp.Business.Factories.APV\QuoteFactory.cs:line 46 at MEA.SmartApp.Business.Factories.APV.UnitTests.QuoteFactoryTest.GetQuoteService_NoExceptions() in C:\MetLife_Sourcecode\Common\DEV2\MEA.Smartapp.Common\Unit Tests\MEA.SmartApp.Business.Factories.APV.UnitTests\QuoteFactoryTest.cs:line 18 Result Message: Test method MEA.SmartApp.Business.Factories.APV.UnitTests.QuoteFactoryTest.GetQuoteService_NoExceptions threw exception: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://ift.tt/19X4Ntk for more information.

*I realize this isnt a true unit test since it is trying to connect to a DB, so if you have any suggestions of how to fix that, let me know.