Revert "media_encoder: fixed unitTest"

This reverts commit 5d8d6252.

Reason for revert: <INSERT REASONING HERE>

Change-Id: I6bf7ed70695901cc9e115ea93155be720c71ee29

test/unitTest/media/test_media_encoder.cpp

@@ -50,6 +50,7 @@ private:
     std::unique_ptr<MediaEncoder> encoder_;
     std::unique_ptr<MediaIOHandle> ioHandle_;
     std::vector<std::string> files_;
+    std::string cacheDir_;
 };
 
 CPPUNIT_TEST_SUITE_NAMED_REGISTRATION(MediaEncoderTest, MediaEncoderTest::name());
@@ -60,7 +61,8 @@ MediaEncoderTest::setUp()
     DRing::init(DRing::InitFlag(DRing::DRING_FLAG_DEBUG | DRing::DRING_FLAG_CONSOLE_LOG));
     libav_utils::ring_avcodec_init();
     encoder_.reset(new MediaEncoder);
-    files_.push_back("test.mkv");
+    cacheDir_ = fileutils::get_cache_dir() + DIR_SEPARATOR_CH;
+    files_.push_back(cacheDir_ + "test.mkv");
 }
 
 void
@@ -68,7 +70,7 @@ MediaEncoderTest::tearDown()
 {
     // clean up behind ourselves
     for (const auto& file : files_)
-        fileutils::remove(file);
+        fileutils::remove(cacheDir_ + file);
     DRing::fini();
 }
 
@@ -162,7 +164,8 @@ MediaEncoderTest::testMultiStream()
     );
 
     try {
-        encoder_->openFileOutput("test.mkv", options);
+        encoder_->openFileOutput(cacheDir_ + "test.mkv", options);
+        encoder_->setIOContext(ioHandle_);
         int videoIdx = encoder_->addStream(*vp8Codec.get());
         CPPUNIT_ASSERT(videoIdx >= 0);
         CPPUNIT_ASSERT(encoder_->getStreamCount() == 1);
@@ -170,8 +173,8 @@ MediaEncoderTest::testMultiStream()
         CPPUNIT_ASSERT(audioIdx >= 0);
         CPPUNIT_ASSERT(videoIdx != audioIdx);
         CPPUNIT_ASSERT(encoder_->getStreamCount() == 2);
-        encoder_->setIOContext(ioHandle_);
         encoder_->startIO();
+
         int sentSamples = 0;
         AVFrame* audio = nullptr;
         AVFrame* video = nullptr;