4 files changed, 32 insertions, 4 deletions
diff --git a/test/functional/api/buffer_spec.lua b/test/functional/api/buffer_spec.lua
index a15d489a1f..0eefa25a13 100644
--- a/test/functional/api/buffer_spec.lua
+++ b/test/functional/api/buffer_spec.lua
@@ -3,6 +3,7 @@ local helpers = require('test.functional.helpers')
 local clear, nvim, buffer = helpers.clear, helpers.nvim, helpers.buffer
 local curbuf, curwin, eq = helpers.curbuf, helpers.curwin, helpers.eq
 local curbufmeths, ok = helpers.curbufmeths, helpers.ok
+local funcs = helpers.funcs
 
 describe('buffer_* functions', function()
   before_each(clear)
@@ -234,11 +235,14 @@ describe('buffer_* functions', function()
 
   end)
 
-  describe('{get,set}_var', function()
+  describe('{get,set,del}_var', function()
     it('works', function()
       curbuf('set_var', 'lua', {1, 2, {['3'] = 1}})
       eq({1, 2, {['3'] = 1}}, curbuf('get_var', 'lua'))
       eq({1, 2, {['3'] = 1}}, nvim('eval', 'b:lua'))
+      eq(1, funcs.exists('b:lua'))
+      curbufmeths.del_var('lua')
+      eq(0, funcs.exists('b:lua'))
     end)
   end)
 
diff --git a/test/functional/api/tabpage_spec.lua b/test/functional/api/tabpage_spec.lua
index 9937e0c72e..0f59bbea7b 100644
--- a/test/functional/api/tabpage_spec.lua
+++ b/test/functional/api/tabpage_spec.lua
@@ -3,6 +3,9 @@ local helpers = require('test.functional.helpers')
 local clear, nvim, tabpage, curtab, eq, ok =
   helpers.clear, helpers.nvim, helpers.tabpage, helpers.curtab, helpers.eq,
   helpers.ok
+local wait = helpers.wait
+local curtabmeths = helpers.curtabmeths
+local funcs = helpers.funcs
 
 describe('tabpage_* functions', function()
   before_each(clear)
@@ -21,11 +24,14 @@ describe('tabpage_* functions', function()
     end)
   end)
 
-  describe('{get,set}_var', function()
+  describe('{get,set,del}_var', function()
     it('works', function()
       curtab('set_var', 'lua', {1, 2, {['3'] = 1}})
       eq({1, 2, {['3'] = 1}}, curtab('get_var', 'lua'))
       eq({1, 2, {['3'] = 1}}, nvim('eval', 't:lua'))
+      eq(1, funcs.exists('t:lua'))
+      curtabmeths.del_var('lua')
+      eq(0, funcs.exists('t:lua'))
     end)
   end)
 
diff --git a/test/functional/api/vim_spec.lua b/test/functional/api/vim_spec.lua
index 699a0bd588..389badb423 100644
--- a/test/functional/api/vim_spec.lua
+++ b/test/functional/api/vim_spec.lua
@@ -4,6 +4,8 @@ local Screen = require('test.functional.ui.screen')
 local clear, nvim, eq, neq = helpers.clear, helpers.nvim, helpers.eq, helpers.neq
 local ok, nvim_async, feed = helpers.ok, helpers.nvim_async, helpers.feed
 local os_name = helpers.os_name
+local meths = helpers.meths
+local funcs = helpers.funcs
 
 describe('vim_* functions', function()
   before_each(clear)
@@ -70,11 +72,14 @@ describe('vim_* functions', function()
     end)
   end)
 
-  describe('{get,set}_var', function()
+  describe('{get,set,del}_var', function()
     it('works', function()
       nvim('set_var', 'lua', {1, 2, {['3'] = 1}})
       eq({1, 2, {['3'] = 1}}, nvim('get_var', 'lua'))
       eq({1, 2, {['3'] = 1}}, nvim('eval', 'g:lua'))
+      eq(1, funcs.exists('g:lua'))
+      meths.del_var('lua')
+      eq(0, funcs.exists('g:lua'))
     end)
 
     it('set_var returns the old value', function()
@@ -84,6 +89,14 @@ describe('vim_* functions', function()
       eq(val1, nvim('set_var', 'lua', val2))
     end)
 
+    it('del_var returns the old value', function()
+      local val1 = {1, 2, {['3'] = 1}}
+      local val2 = {4, 7}
+      eq(NIL, meths.set_var('lua', val1))
+      eq(val1, meths.set_var('lua', val2))
+      eq(val2, meths.del_var('lua'))
+    end)
+
     it('truncates values with NULs in them', function()
       nvim('set_var', 'xxx', 'ab\0cd')
       eq('ab', nvim('get_var', 'xxx'))
diff --git a/test/functional/api/window_spec.lua b/test/functional/api/window_spec.lua
index 17aacafe9b..92a33b4cdb 100644
--- a/test/functional/api/window_spec.lua
+++ b/test/functional/api/window_spec.lua
@@ -5,6 +5,8 @@ local clear, nvim, curbuf, curbuf_contents, window, curwin, eq, neq,
   helpers.curbuf_contents, helpers.window, helpers.curwin, helpers.eq,
   helpers.neq, helpers.ok, helpers.feed, helpers.insert, helpers.eval
 local wait = helpers.wait
+local curwinmeths = helpers.curwinmeths
+local funcs = helpers.funcs
 
 -- check if str is visible at the beginning of some line
 local function is_visible(str)
@@ -126,11 +128,14 @@ describe('window_* functions', function()
     end)
   end)
 
-  describe('{get,set}_var', function()
+  describe('{get,set,del}_var', function()
     it('works', function()
       curwin('set_var', 'lua', {1, 2, {['3'] = 1}})
       eq({1, 2, {['3'] = 1}}, curwin('get_var', 'lua'))
       eq({1, 2, {['3'] = 1}}, nvim('eval', 'w:lua'))
+      eq(1, funcs.exists('w:lua'))
+      curwinmeths.del_var('lua')
+      eq(0, funcs.exists('w:lua'))
     end)
   end)