feat(lua): add vim.iconv (#18286)

Co-authored-by: Justin M. Keyes <justinkz@gmail.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/test/functional/lua/vim_spec.lua b/test/functional/lua/vim_spec.lua
index 2b249b7a69..f2fb661b70 100644
--- a/test/functional/lua/vim_spec.lua
+++ b/test/functional/lua/vim_spec.lua
@@ -2721,6 +2721,39 @@ describe('lua stdlib', function()
       ]]
     end)
   end)
+
+  describe('vim.iconv', function()
+    it('can convert strings', function()
+      eq('hello', exec_lua[[
+        return vim.iconv('hello', 'latin1', 'utf-8')
+      ]])
+    end)
+
+    it('can validate arguments', function()
+      eq({false, 'Expected at least 3 arguments'}, exec_lua[[
+        return {pcall(vim.iconv, 'hello')}
+      ]])
+
+      eq({false, 'bad argument #3 to \'?\' (expected string)'}, exec_lua[[
+        return {pcall(vim.iconv, 'hello', 'utf-8', true)}
+      ]])
+    end)
+
+    it('can handle bad encodings', function()
+      eq(NIL, exec_lua[[
+        return vim.iconv('hello', 'foo', 'bar')
+      ]])
+    end)
+
+    it('can handle strings with NUL bytes', function()
+      eq(7, exec_lua[[
+        local a = string.char(97, 98, 99, 0, 100, 101, 102) -- abc\0def
+        return string.len(vim.iconv(a, 'latin1', 'utf-8'))
+      ]])
+    end)
+
+  end)
+
 end)
 
 describe('lua: builtin modules', function()