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diff --git a/test/compat_test.lua b/test/compat_test.lua
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+-- test/compat_test.lua
+-- A small test suite for the lua-compat-5.3 layer.
+-- Can be run in two ways:
+-- 1. ./lush test/compat_test.lua (runs all tests)
+-- 2. ./lush test/compat_test.lua test_table_unpack (runs a single test)
+
+local tests = {}
+
+function tests.test_table_unpack()
+  print("--- Running test: table.unpack ---")
+  local my_table = { "a", "b", "c" }
+  -- The compat layer provides table.unpack for Lua 5.1.
+  local x, y, z = table.unpack(my_table)
+  assert(x == "a", "unpack failed for first element")
+  assert(y == "b", "unpack failed for second element")
+  assert(z == "c", "unpack failed for third element")
+  print("...SUCCESS!")
+end
+
+function tests.test_math_log_base()
+  print("--- Running test: math.log with base ---")
+  -- Lua 5.1's math.log only takes one argument. The compat layer adds the base.
+  local result = math.log(100, 10)
+  -- Use a small epsilon for floating point comparison
+  assert(math.abs(result - 2) < 1e-9, "math.log(100, 10) should be 2")
+  print("...SUCCESS!")
+end
+
+function tests.test_string_rep_separator()
+    print("--- Running test: string.rep with separator ---")
+    -- Lua 5.1's string.rep doesn't have the separator argument.
+    local result = string.rep("a", 3, "-")
+    assert(result == "a-a-a", "string.rep with separator failed, got: " .. tostring(result))
+    print("...SUCCESS!")
+end
+
+
+-- NOTE: The lush C host provides arguments in a global table named 'args', not 'arg'.
+local test_to_run = args and args[1]
+
+if test_to_run and tests[test_to_run] then
+  -- If a valid test name is provided, run only that test.
+  local success, err = pcall(tests[test_to_run])
+  if not success then
+    print("...FAILURE: " .. err)
+  end
+elseif test_to_run then
+  -- If an invalid name is provided, show an error.
+  print("ERROR: Test function '" .. test_to_run .. "' not found.")
+else
+  -- If no specific test is requested, run all of them.
+  print("--- Running all compatibility tests ---")
+  for name, func in pairs(tests) do
+    local success, err = pcall(func)
+    if not success then
+      print("...FAILURE on test '" .. name .. "': " .. err)
+    end
+  end
+  print("--- All tests complete ---")
+end