diff --git a/.gitignore b/.gitignore
index 7af7b3572..e9e020ff5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 *.got.svg
 e2e_report.html
 bin
+out
diff --git a/ci/cov.sh b/ci/cov.sh
new file mode 100755
index 000000000..63d5bb812
--- /dev/null
+++ b/ci/cov.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+set -eu
+cd -- "$(dirname "$0")/.."
+. ./ci/sub/lib.sh
+
+main() {
+  if [ "$*" = "" ]; then
+    set ./...
+  fi
+
+  mkdir -p out
+  capcode ./ci/test.sh -covermode=atomic -coverprofile=out/cov.prof "$@"
+  go tool cover -html=out/cov.prof -o=out/cov.html
+  go tool cover -func=out/cov.prof | grep '^total:' \
+    | sed 's#^total:.*(statements)[[:space:]]*\([0-9.%]*\)#TOTAL:\t\1#'
+  return "$code"
+}
+
+main "$@"