1 files changed, 24 insertions, 3 deletions
diff --git a/test/functional/lua/treesitter_spec.lua b/test/functional/lua/treesitter_spec.lua
index 8916e59563..f3f7f4fd0a 100644
--- a/test/functional/lua/treesitter_spec.lua
+++ b/test/functional/lua/treesitter_spec.lua
@@ -8,6 +8,7 @@ local insert = helpers.insert
 local meth_pcall = helpers.meth_pcall
 local exec_lua = helpers.exec_lua
 local iswin = helpers.iswin
+local feed = helpers.feed
 
 before_each(clear)
 
@@ -46,12 +47,11 @@ describe('tree-sitter API', function()
         }]])
 
       exec_lua([[
-        parser = vim.treesitter.create_parser(0, "c")
-        tree = parser:parse_tree()
+        parser = vim.treesitter.get_parser(0, "c")
+        tree = parser:parse()
         root = tree:root()
       ]])
 
-      --eq("<parser>", exec_lua("return tostring(parser)"))
       eq("<tree>", exec_lua("return tostring(tree)"))
       eq("<node translation_unit>", exec_lua("return tostring(root)"))
       eq({0,0,3,0}, exec_lua("return {root:range()}"))
@@ -60,6 +60,27 @@ describe('tree-sitter API', function()
       exec_lua("child = root:child(0)")
       eq("<node function_definition>", exec_lua("return tostring(child)"))
       eq({0,0,2,1}, exec_lua("return {child:range()}"))
+
+      exec_lua("descendant = root:descendant_for_point_range(1,2,1,12)")
+      eq("<node declaration>", exec_lua("return tostring(descendant)"))
+      eq({1,2,1,12}, exec_lua("return {descendant:range()}"))
+      eq("(declaration (primitive_type) (init_declarator (identifier) (number_literal)))", exec_lua("return descendant:sexpr()"))
+
+      feed("2G7|ay")
+      exec_lua([[
+        tree2 = parser:parse()
+        root2 = tree2:root()
+        descendant2 = root2:descendant_for_point_range(1,2,1,13)
+      ]])
+      eq(false, exec_lua("return tree2 == tree1"))
+      eq("<node declaration>", exec_lua("return tostring(descendant2)"))
+      eq({1,2,1,13}, exec_lua("return {descendant2:range()}"))
+
+      -- orginal tree did not change
+      eq({1,2,1,12}, exec_lua("return {descendant:range()}"))
+
+      -- unchanged buffer: return the same tree
+      eq(true, exec_lua("return parser:parse() == tree2"))
     end)
 
   end)