1 files changed, 24 insertions, 0 deletions
diff --git a/test/functional/eval/container_functions_spec.lua b/test/functional/eval/container_functions_spec.lua
new file mode 100644
index 0000000000..04a3248c49
--- /dev/null
+++ b/test/functional/eval/container_functions_spec.lua
@@ -0,0 +1,24 @@
+local helpers = require('test.functional.helpers')(after_each)
+
+local eq = helpers.eq
+local eval = helpers.eval
+local meths = helpers.meths
+local clear = helpers.clear
+
+before_each(clear)
+
+describe('extend()', function()
+  it('suceeds to extend list with itself', function()
+    meths.set_var('l', {1, {}})
+    eq({1, {}, 1, {}}, eval('extend(l, l)'))
+    eq({1, {}, 1, {}}, meths.get_var('l'))
+
+    meths.set_var('l', {1, {}})
+    eq({1, {}, 1, {}}, eval('extend(l, l, 0)'))
+    eq({1, {}, 1, {}}, meths.get_var('l'))
+
+    meths.set_var('l', {1, {}})
+    eq({1, 1, {}, {}}, eval('extend(l, l, 1)'))
+    eq({1, 1, {}, {}}, meths.get_var('l'))
+  end)
+end)