Add unittest

Add unittest
[   39s] + ./miniz_oxide
[   39s]
[   39s] running 22 tests
[   39s] test deflate::core::test::compress_output ... ok
[   39s] test deflate::core::test::u16_to_slice ... ok
[   39s] test deflate::core::test::u16_from_slice ... ok
[   39s] test deflate::core::test::compress_fast ... ok
[   39s] test deflate::core::zlib::test::test_header ... ok
[   39s] test deflate::core::zlib::test::zlib ... ok
[   39s] test deflate::stream::test::test_state ... ok
[   39s] test deflate::test::compress_huff_only ... ok
[   39s] test deflate::test::compress_raw ... ok
[   39s] test deflate::test::compress_small ... ok
[   39s] test deflate::test::short ... ok
[   39s] test inflate::core::test::bogus_input ... ok
[   39s] test inflate::core::test::empty_output_buffer_non_wrapping ... ok
[   39s] test inflate::core::test::fixed_table_lookup ... ok
[   39s] test inflate::core::test::empty_output_buffer_wrapping ... ok
[   39s] test inflate::core::test::decompress_zlib ... ok
[   39s] test inflate::core::test::raw_block ... ok
[   39s] test inflate::stream::test::test_state ... ok
[   39s] test inflate::test::decompress_vec ... ok
[   39s] test inflate::test::decompress_vec_with_high_limit ... ok
[   39s] test inflate::test::fail_to_decompress_with_limit ... ok
[   39s] test inflate::test::test_decompress_slice_iter_to_slice ... ok
[   39s]
[   39s] test result: ok. 22 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s