Run `go test`, only displaying error output, plus print counts of all tests passed/failed/etc.

go-test-pretty.sh

#!/bin/bash
#
# Runs `go test -v`, parses the output and only displays errors. Also displays
# a summary of tests passed/failed/skipped/etc.
#
set -o pipefail

declare buffer=
declare test_error=false

declare -a go_args

declare -i run=0
declare -i passed=0
declare -i failed=0
declare -i skipped=0
declare -i errors=0
declare -i races=0

#
# Add lines to the buffer.
#
_add_to_buffer() {
	for data in "$@"; do
		buffer="$buffer"$'\n'"$data"
	done
}

#
# Print the contents of the current buffer if there was a test error.
#
_print_last_test_error() {
	if $test_error; then
		echo "$buffer" >&2
	fi
}

#
# Print counts of all tests run and their results.
#
_print_tests_summary() {
	echo
	echo "# tests: $run"
	[ $passed -ne 0 ] && echo "# passed: $passed"
	[ $failed -ne 0 ] && echo "# failed: $failed"
	[ $skipped -ne 0 ] && echo "# skipped: $skipped"
	[ $errors -ne 0 ] && echo "# errors: $errors"
	[ $races -ne 0 ] && echo "# races: $races"
	echo
}

#
# Takes the output of "go test -v" but only capture errors.
#
_capture() {
	while IFS= read -r line; do
		case $line in
			"=== RUN"*)
				# Beginning of new test...
				run=$(($run+1))

				# If there was an error during the last test, print the error
				# before resetting.
				_print_last_test_error

				test_error=false
				buffer=
				;;

			"--- PASS:"*)
				passed=$(($passed+1))
				;;

			"--- FAIL:"*)
				failed=$(($failed+1))
				test_error=true
				;;

			"--- SKIP:"*)
				skipped=$(($skipped+1))
				;;

			# Compile errors
			"FAIL"*"[setup failed]")
				errors=$(($errors+1))
				test_error=true
				;;

			# Data races
			"WARNING: DATA RACE"*)
				races=$(($races+1))
				test_error=true
				;;
			ok*)
				echo "$line"
				;;
		esac

		_add_to_buffer "$line"

	done

	# Case where compile errors cause no tests to run at all; we want to see
	# the complete output.
	if [ $run -eq 0 ]; then
		test_error=true
	fi

	_print_last_test_error

	_print_tests_summary
}

# Collect extra args to pass to go, except for -v, which we are already passing
for arg in "$@"; do
	if [ "$arg" == "-v" ]; then
		continue
	fi

	go_args+=("$arg")
done

go test -v "${go_args[@]}" 2>&1 |_capture

# Exit with return code from go
exit $PIPESTATUS

Very good.