Add 42 layers test

test/Dockerfile

@@ -0,0 +1,43 @@
+FROM yungsang/busybox
+RUN echo layer=1
+RUN echo layer=2
+RUN echo layer=3
+RUN echo layer=4
+RUN echo layer=5
+RUN echo layer=6
+RUN echo layer=7
+RUN echo layer=8
+RUN echo layer=9
+RUN echo layer=10
+RUN echo layer=11
+RUN echo layer=12
+RUN echo layer=13
+RUN echo layer=14
+RUN echo layer=15
+RUN echo layer=16
+RUN echo layer=17
+RUN echo layer=18
+RUN echo layer=19
+RUN echo layer=20
+RUN echo layer=21
+RUN echo layer=22
+RUN echo layer=23
+RUN echo layer=24
+RUN echo layer=25
+RUN echo layer=26
+RUN echo layer=27
+RUN echo layer=28
+RUN echo layer=29
+RUN echo layer=30
+RUN echo layer=31
+RUN echo layer=32
+RUN echo layer=33
+RUN echo layer=34
+RUN echo layer=35
+RUN echo layer=36
+RUN echo layer=37
+RUN echo layer=38
+RUN echo layer=39
+RUN echo layer=40
+RUN echo layer=41
+RUN echo layer=42

test/Vagrantfile

@@ -21,6 +21,7 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
 
   config.vm.provision :docker do |d|
     d.pull_images "yungsang/busybox"
+    d.build_image "/vagrant/"
     d.run "simple-echo",
       image: "yungsang/busybox",
       args: "-p 8080:8080",