Add a test for ResizeableBuffer

Change-Id: I15375104a525d459fdb0439df4c2b8f8584b75ca
diff --git a/aos/containers/BUILD b/aos/containers/BUILD
index 8277212..9e527cd 100644
--- a/aos/containers/BUILD
+++ b/aos/containers/BUILD
@@ -66,3 +66,15 @@
         "@com_github_google_glog//:glog",
     ],
 )
+
+cc_test(
+    name = "resizeable_buffer_test",
+    srcs = [
+        "resizeable_buffer_test.cc",
+    ],
+    deps = [
+        ":resizeable_buffer",
+        "//aos/testing:googletest",
+        "@com_google_absl//absl/types:span",
+    ],
+)