Check if Java environment hangs on to File descriptors when using FileOutputStream

gistfile1.java

    public static boolean isFOSHoldingOnToFile() {
        return !canDeleteCreatedFile() || !canRenameCreatedFile();
    }

    public static boolean canDeleteCreatedFile() {
        File temp = null;
        try {
            temp = File.createTempFile("canDeleteCreatedFile", null, Robolectric.application.getCacheDir());
            if(!temp.delete()) {
                return false;
            }
            assertFalse(temp.exists());
            writeFile(temp, "content".getBytes());
            return temp.delete();
        } catch(Exception ex) {
            return false; // if anything above goes wrong we can assume it won't work
        } finally {
            if (temp != null) {
                temp.delete();
                temp.deleteOnExit();
            }
        }
    }

    public static boolean canRenameCreatedFile() {
        File temp1 = null;
        File temp2 = null;
        try {
            temp1 = File.createTempFile("canRenameCreatedFile", null, Robolectric.application.getCacheDir());
            temp2 = File.createTempFile("canRenameCreatedFile", null, Robolectric.application.getCacheDir());
            if(!temp1.delete() || !temp2.delete()) {
                return false;
            }
            assertFalse(temp1.exists());
            assertFalse(temp2.exists());
            writeFile(temp1, "content".getBytes());
            return temp1.renameTo(temp2);
        } catch(Exception ex) {
            return false; // if anything above goes wrong we can assume it won't work
        } finally {
            if (temp1 != null) {
                temp1.delete();
                temp1.deleteOnExit();
            }
            if (temp2 != null) {
                temp2.delete();
                temp2.deleteOnExit();
            }
        }
    }