diff --git a/tests/testthat/test-lzstringr.R b/tests/testthat/test-lzstringr.R
index 8160222..3062920 100644
--- a/tests/testthat/test-lzstringr.R
+++ b/tests/testthat/test-lzstringr.R
@@ -131,10 +131,50 @@ test_that("Compress and Decompress for different encodings", {
   latin1_str <- rawToChar(as.raw(0xFF))
   Encoding(latin1_str) <- "latin1"
   compare_compress_decompress(latin1_str)
+
+  japanese_text <- "こんにちは"  # Hello in Japanese
+  encoded_text <- iconv(japanese_text, from = "UTF-8", to = "Shift-JIS")
+  decoded_text <- iconv(encoded_text, from = "Shift-JIS", to = "UTF-8")
+  compressed <- compressToBase64(decoded_text)
+  decompressed <- decompressFromBase64(compressed)
+  expect_equal(decompressed, japanese_text)
+})
+
+test_that("Compression handles special characters and symbols", {
+  text <- "𐐷𐑌 – Mathematical symbols: ∑ ∫, Emoji: 😊, Arabic: العربية, Hebrew: עברית"
+  expect_no_error(compressToBase64(text))
+  compare_compress_decompress(text)
+  text <- "漢字 – Kanji, Cyrillic: Цирилица, Thai: ภาษาไทย"
+  expect_no_error(compressToBase64(text))
+  compare_compress_decompress(text)
+})
+
+test_that("Decompression handles malformed input gracefully", {
+  malformed_base64 <- "This isn't base64 at all!"
+  # Decompression should handle this without crashing
+  expect_no_error(decompressFromBase64(malformed_base64))
+  expect_equal(decompressFromBase64(malformed_base64), "")
 })
 
+
 ## Test cases for specific operating systems ----
-test_that("Compress and Decompress for specific operating systems", {
+test_that("Compression handles OS-specific encodings", {
   skip()
+  input_windows <- iconv("This is a test – with a dash", from = "UTF-8", to = "Windows-1252")
+  input_mac <- iconv("This is a test – with a dash", from = "UTF-8", to = "macintosh")
+  compressToBase64(input_windows)
+  compare_compress_decompress(input_windows)
+  compare_compress_decompress(input_mac)
 })
 
+# Test cases for to and from URI component encoding ----
+test_that("Compress and Decompress for URI encoding", {
+  text <- "[{\"name\":\"app.py\",\"content\":\"from shiny.express import input, render, ui\\n\\nui.input_slider(\\\"n\\\", \\\"N\\\", 0, 100, 20)\\n\\n\\n@render.text\\ndef txt():\\n    return f\\\"n*2 is {input.n() * 2}\\\"\\n\"}]"
+  hash <- "NobwRAdghgtgpmAXGKAHVA6VBPMAaMAYwHsIAXOcpMAMwCdiYACAZwAsBLCbDOAD1R04LFkw4xUxOmTERUAVzJ4mQiABM4dZfI4AdCPp0YuCsgH0WAGw4a6ACl2RHyxwDlnTAAzKAjJ+9MAEyeAJT64RAAAqq2GBR8ZPoaNExkCXYhiPpMOSpwZPJ0EEw0jhAAVIFioiAmihgQGUzlQQC+jvpgrQC6QA"
+
+  compressed <- compressToEncodedURIComponent(text)
+  expect_equal(compressed, hash)
+
+  decompressed <- decompressFromEncodedURIComponent(compressed)
+  expect_equal(decompressed, text)
+})