diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 047263f..be40336 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,3 @@
 test:
   script:
-    - go vet -v ./...
-    - go test -v ./...
+    - ./ci_check
diff --git a/ci_check b/ci_check
new file mode 100755
index 0000000..4a6f801
--- /dev/null
+++ b/ci_check
@@ -0,0 +1,26 @@
+#!/bin/sh
+set -e
+old_dir=$PWD
+new_dir=`mktemp -d`
+
+cleanup() {
+  rm -rf "$new_dir"
+}
+trap cleanup EXIT
+
+cp -r . "$new_dir"
+cd "$new_dir"
+
+checkgen() {
+  $1
+  if ! diff -r . "$old_dir"
+  then
+    echo $2 1>&2
+    return 1
+  fi
+}
+
+checkgen 'go generate ./...' 'Generated files not up-to-date. Please run go generate.'
+checkgen 'go fmt ./...' '.go files not formatted. Please run go fmt.'
+go vet ./...
+go test ./...