diff --git a/unittests/vector_erase_at.chai b/unittests/vector_erase_at.chai
new file mode 100644
index 0000000..ac669c7
--- /dev/null
+++ b/unittests/vector_erase_at.chai
@@ -0,0 +1,3 @@
+var x = [1, 2, 3]
+x.erase_at(1)
+print(x)
diff --git a/unittests/vector_erase_at.txt b/unittests/vector_erase_at.txt
new file mode 100644
index 0000000..f988c4a
--- /dev/null
+++ b/unittests/vector_erase_at.txt
@@ -0,0 +1 @@
+[1, 3]
diff --git a/unittests/vector_insert_at.chai b/unittests/vector_insert_at.chai
new file mode 100644
index 0000000..f0d92b9
--- /dev/null
+++ b/unittests/vector_insert_at.chai
@@ -0,0 +1,3 @@
+var x = [1, 2, 3]
+x.insert_at(1, 6)
+print(x)
diff --git a/unittests/vector_insert_at.txt b/unittests/vector_insert_at.txt
new file mode 100644
index 0000000..4517f0f
--- /dev/null
+++ b/unittests/vector_insert_at.txt
@@ -0,0 +1 @@
+[1, 6, 2, 3]