Script to generate stub_test.go files for any package without tests to produce 0% coverage for those packages

gen-go-test-stubs

#!/usr/bin/env bash
gen_stub() {
	set -e
	local pkg="$1"
	local pkgdir="$(go list -f '{{.Dir}}' "$pkg")"
	local pkgname="$(go list -f '{{.Name}}' "$pkg")"
	local stub="$pkgdir/stub_test.go"
	if [ -e "$stub" ]; then
		echo "# Cannot create $stub: file already exists" >&2
		return 1
	fi
	echo "$stub"
	gofmt >"$stub" <<EOF
// TODO: Add tests for package $pkgname

package $pkgname

import "testing"

func TestStub(*testing.T) {
	// This test is a generated stub -- remove it once tests are added to the package
}
EOF
}

if [ $# -eq 0 ]; then
	set -- ./...
fi

export -f gen_stub
go list -f '{{if not (or .TestGoFiles .XTestGoFiles)}}{{.ImportPath}}{{end}}' "$@" |
	xargs --no-run-if-empty -L1 bash -c 'gen_stub "$@"' _