test: add a test to confirm that mp3 file is stored (not compressed)

brut.apktool/apktool-lib/src/test/java/brut/androlib/aapt1/BuildAndDecodeTest.java

@@ -173,6 +173,13 @@ public class BuildAndDecodeTest extends BaseTest {
         assertEquals(0x8888, aaaa.length());
     }
 
+    @Test
+    public void storedMp3FilesAreNotCompressedTest() throws BrutException {
+        ExtFile extFile = new ExtFile(sTmpDir, "testapp.apk");
+        Integer built = extFile.getDirectory().getCompressionLevel("res/raw/rain.mp3");
+        assertEquals(new Integer(0), built);
+    }
+
     @Test
     public void crossTypeTest() throws BrutException {
         compareValuesFiles("values-mcc003/strings.xml");

brut.apktool/apktool-lib/src/test/resources/aapt1/testapp/apktool.yml

@@ -10,6 +10,10 @@ versionInfo:
   versionCode: '1'
   versionName: '1.0'
 compressionType: false
+doNotCompress:
+- arsc
+- png
+- mp3
 unknownFiles:
   hidden.file: '8'
   non\u007Fprintable.file: '8'