1 files changed, 57 insertions, 4 deletions
diff --git a/test/functional/lua/fs_spec.lua b/test/functional/lua/fs_spec.lua
index 6bc1ddbff6..0ba0948eee 100644
--- a/test/functional/lua/fs_spec.lua
+++ b/test/functional/lua/fs_spec.lua
@@ -168,8 +168,8 @@ describe('vim.fs', function()
 
       local function run(dir, depth, skip)
         return exec_lua(function()
-          local r = {}
-          local skip_f
+          local r = {} --- @type table<string, string>
+          local skip_f --- @type function
           if skip then
             skip_f = function(n0)
               if vim.tbl_contains(skip or {}, n0) then
@@ -493,8 +493,8 @@ describe('vim.fs', function()
   end)
 
   describe('abspath()', function()
-    local cwd = is_os('win') and vim.uv.cwd():gsub('\\', '/') or vim.uv.cwd()
-    local home = is_os('win') and vim.uv.os_homedir():gsub('\\', '/') or vim.uv.os_homedir()
+    local cwd = assert(t.fix_slashes(assert(vim.uv.cwd())))
+    local home = t.fix_slashes(assert(vim.uv.os_homedir()))
 
     it('works', function()
       eq(cwd .. '/foo', vim.fs.abspath('foo'))
@@ -526,4 +526,57 @@ describe('vim.fs', function()
       end)
     end
   end)
+
+  describe('relpath()', function()
+    it('works', function()
+      local cwd = assert(t.fix_slashes(assert(vim.uv.cwd())))
+      local my_dir = vim.fs.joinpath(cwd, 'foo')
+
+      eq(nil, vim.fs.relpath('/var/lib', '/var'))
+      eq(nil, vim.fs.relpath('/var/lib', '/bin'))
+      eq(nil, vim.fs.relpath(my_dir, 'bin'))
+      eq(nil, vim.fs.relpath(my_dir, './bin'))
+      eq(nil, vim.fs.relpath(my_dir, '././'))
+      eq(nil, vim.fs.relpath(my_dir, '../'))
+      eq(nil, vim.fs.relpath('/var/lib', '/'))
+      eq(nil, vim.fs.relpath('/var/lib', '//'))
+      eq(nil, vim.fs.relpath(' ', '/var'))
+      eq(nil, vim.fs.relpath(' ', '/var'))
+      eq('.', vim.fs.relpath('/var/lib', '/var/lib'))
+      eq('lib', vim.fs.relpath('/var/', '/var/lib'))
+      eq('var/lib', vim.fs.relpath('/', '/var/lib'))
+      eq('bar/package.json', vim.fs.relpath('/foo/test', '/foo/test/bar/package.json'))
+      eq('foo/bar', vim.fs.relpath(cwd, 'foo/bar'))
+      eq('foo/bar', vim.fs.relpath('.', vim.fs.joinpath(cwd, 'foo/bar')))
+      eq('bar', vim.fs.relpath('foo', 'foo/bar'))
+      eq(nil, vim.fs.relpath('/var/lib', '/var/library/foo'))
+
+      if is_os('win') then
+        eq(nil, vim.fs.relpath('/', ' '))
+        eq(nil, vim.fs.relpath('/', 'var'))
+      else
+        local cwd_rel_root = cwd:sub(2)
+        eq(cwd_rel_root .. '/ ', vim.fs.relpath('/', ' '))
+        eq(cwd_rel_root .. '/var', vim.fs.relpath('/', 'var'))
+      end
+
+      if is_os('win') then
+        eq(nil, vim.fs.relpath('c:/aaaa/', '/aaaa/cccc'))
+        eq(nil, vim.fs.relpath('c:/aaaa/', './aaaa/cccc'))
+        eq(nil, vim.fs.relpath('c:/aaaa/', 'aaaa/cccc'))
+        eq(nil, vim.fs.relpath('c:/blah\\blah', 'd:/games'))
+        eq(nil, vim.fs.relpath('c:/games', 'd:/games'))
+        eq(nil, vim.fs.relpath('c:/games', 'd:/games/foo'))
+        eq(nil, vim.fs.relpath('c:/aaaa/bbbb', 'c:/aaaa'))
+        eq('cccc', vim.fs.relpath('c:/aaaa/', 'c:/aaaa/cccc'))
+        eq('aaaa/bbbb', vim.fs.relpath('C:/', 'c:\\aaaa\\bbbb'))
+        eq('bar/package.json', vim.fs.relpath('C:\\foo\\test', 'C:\\foo\\test\\bar\\package.json'))
+        eq('baz', vim.fs.relpath('\\\\foo\\bar', '\\\\foo\\bar\\baz'))
+        eq(nil, vim.fs.relpath('a/b/c', 'a\\b'))
+        eq('d', vim.fs.relpath('a/b/c', 'a\\b\\c\\d'))
+        eq('.', vim.fs.relpath('\\\\foo\\bar\\baz', '\\\\foo\\bar\\baz'))
+        eq(nil, vim.fs.relpath('C:\\foo\\test', 'C:\\foo\\Test\\bar\\package.json'))
+      end
+    end)
+  end)
 end)