Fixed findtestdata selftest on mac

This test relies on being able to set a custom QLibraryInfo::PrefixPath
for the duration of the test.  However, the test code neglected to
account for the following behavior on mac (from "Using qt.conf"
documentation):

  On Mac OS X, the Prefix is relative to the Contents in the application
  bundle.

Change-Id: Ie9b6d5ebfe8af7d7f332e827069b60a830d6c6f2
Reviewed-by: Jason McDonald <jason.mcdonald@nokia.com>

tests/auto/testlib/selftests/findtestdata/findtestdata.cpp

@@ -62,7 +62,11 @@ void FindTestData::initTestCase()
 {
     // verify that our qt.conf is working as expected.
     QString app_path = QCoreApplication::applicationDirPath();
-    QString install_path = app_path + "/tests";
+    QString install_path = app_path
+#ifdef Q_OS_MAC
+        + "/Contents"
+#endif
+        + "/tests";
     QVERIFY(QDir("/").mkpath(install_path));
     QVERIFY(QDir("/").mkpath(install_path + "/findtestdata"));
     QCOMPARE(QLibraryInfo::location(QLibraryInfo::TestsPath), install_path);
@@ -107,7 +111,11 @@ void FindTestData::paths()
     QVERIFY(touch(testfile_path1));
 
     // 2. at the test install path (faked via qt.conf)
-    QString testfile_path2 = app_path + "/tests/findtestdata/" TESTFILE;
+    QString testfile_path2 = app_path
+#ifdef Q_OS_MAC
+        + "/Contents"
+#endif
+        + "/tests/findtestdata/" TESTFILE;
     QVERIFY(touch(testfile_path2));
 
     // 3. at the source path (which we will fake later on)