1 files changed, 12 insertions, 4 deletions
diff --git a/test/functional/api/extmark_spec.lua b/test/functional/api/extmark_spec.lua
index fab1557204..3f9cb94260 100644
--- a/test/functional/api/extmark_spec.lua
+++ b/test/functional/api/extmark_spec.lua
@@ -101,6 +101,14 @@ describe('API/extmarks', function()
     ns2 = request('nvim_create_namespace', "my-fancy-plugin2")
   end)
 
+  it('validation', function()
+    eq("Invalid 'end_col': expected Integer, got Array", pcall_err(set_extmark, ns, marks[2], 0, 0, { end_col = {}, end_row = 1 }))
+    eq("Invalid 'end_row': expected Integer, got Array", pcall_err(set_extmark, ns, marks[2], 0, 0, { end_col = 1, end_row = {} }))
+    eq("Invalid 'id': expected positive Integer", pcall_err(set_extmark, ns, {}, 0, 0, { end_col = 1, end_row = 1 }))
+    eq("Invalid mark position: expected 2 Integer items", pcall_err(get_extmarks, ns, {}, {-1, -1}))
+    eq("Invalid mark position: expected mark id Integer or 2-item Array", pcall_err(get_extmarks, ns, true, {-1, -1}))
+  end)
+
   it("can end extranges past final newline using end_col = 0", function()
     set_extmark(ns, marks[1], 0, 0, {
       end_col = 0,
@@ -1344,10 +1352,10 @@ describe('API/extmarks', function()
 
   it('throws consistent error codes', function()
     local ns_invalid = ns2 + 1
-    eq("Invalid ns_id: 3", pcall_err(set_extmark, ns_invalid, marks[1], positions[1][1], positions[1][2]))
-    eq("Invalid ns_id: 3", pcall_err(curbufmeths.del_extmark, ns_invalid, marks[1]))
-    eq("Invalid ns_id: 3", pcall_err(get_extmarks, ns_invalid, positions[1], positions[2]))
-    eq("Invalid ns_id: 3", pcall_err(get_extmark_by_id, ns_invalid, marks[1]))
+    eq("Invalid 'ns_id': 3", pcall_err(set_extmark, ns_invalid, marks[1], positions[1][1], positions[1][2]))
+    eq("Invalid 'ns_id': 3", pcall_err(curbufmeths.del_extmark, ns_invalid, marks[1]))
+    eq("Invalid 'ns_id': 3", pcall_err(get_extmarks, ns_invalid, positions[1], positions[2]))
+    eq("Invalid 'ns_id': 3", pcall_err(get_extmark_by_id, ns_invalid, marks[1]))
   end)
 
   it('when col = line-length, set the mark on eol', function()