diff --git a/based.cabal b/based.cabal
index 1119065..a1a6847 100644
--- a/based.cabal
+++ b/based.cabal
@@ -71,3 +71,13 @@ executable based
     -- base64-bytestring,
   -- hs-source-dirs:
   default-language:    Haskell2010
+
+test-suite based-test
+  type:              exitcode-stdio-1.0
+  hs-source-dirs:    test
+  main-is:           Main.hs
+  build-depends:
+    base,
+    based,
+    HUnit
+  default-language:  Haskell2010
diff --git a/test/Main.hs b/test/Main.hs
new file mode 100644
index 0000000..dd2f75e
--- /dev/null
+++ b/test/Main.hs
@@ -0,0 +1,45 @@
+module Main where
+
+import Test.HUnit
+import Encoding.Base64 (enc64, dec64)
+import System.Exit (exitFailure, exitSuccess)
+
+-- Test cases for enc64 function
+testEnc64 :: Test
+testEnc64 = TestCase $ do
+    assertEqual "for (enc64 \"hello\")," "aGVsbG8=" (enc64 "hello")
+    assertEqual "for (enc64 \"Haskell\")," "SGFza2VsbA==" (enc64 "Haskell")
+    assertEqual "for (enc64 \"\x00\x01\x02\")," "AAEC" (enc64 "\x00\x01\x02")
+    assertEqual "for (enc64 \"😂\")," "8J+Ygg==" (enc64 "😂")
+
+-- Test cases for dec64 function
+testDec64 :: Test
+testDec64 = TestCase $ do
+    assertEqual "for (dec64 \"aGVsbG8=\")," "hello" (dec64 "aGVsbG8=")
+    assertEqual "for (dec64 \"SGFza2VsbA==\")," "Haskell" (dec64 "SGFza2VsbA==")
+    assertEqual "for (dec64 \"AAEC\")," "\x00\x01\x02" (dec64 "AAEC")
+    assertEqual "for (dec64 \"8J+Ygg==\")," "😂" (dec64 "😂")
+
+tests :: Test
+tests = TestList [TestLabel "Test enc64" testEnc64,
+                  TestLabel "Test dec64" testDec64]
+
+-- main :: IO Counts
+-- main = runTestTT tests >>= \counts -> print counts >> runTestTTAndExit tests
+
+-- runAndPrint :: Test -> IO Counts
+-- runAndPrint t = do
+--     counts <- runTestTT t
+--     let label = case t of
+--                   TestLabel l _ -> l
+--                   _             -> "Unnamed test."
+--     putStrLn $ label ++ ": " ++ if errors counts + failures counts == 0 then "[OK]" else "[FAIL]"
+--     return counts
+
+main :: IO ()
+main = do
+    counts <- runTestTT tests
+    print counts
+    if errors counts + failures counts == 0
+        then exitSuccess
+        else exitFailure