### Question:
Lz4CompressUtils { public static byte[] compress(final byte[] src) { if (src == null) { throw new IllegalArgumentException("src must not be null."); } LZ4Compressor compressor = factory.fastCompressor(); return compressor.compress(src); }  static byte[] compress(final byte[] src); static byte[] decompressSafe(final byte[] src, int maxDecompressedSize); static byte[] decompressFast(byte[] src, int srcOffset, int exactDecompressedSize); static byte[] decompressFast(final byte[] src, int exactDecompressedSize);  }### Answer:
@Test public void compress_without_src() throws Exception { expectedException.expect(IllegalArgumentException.class); Lz4CompressUtils.compress(null); }