chore(test): add check-jq dependency check script

Add jq to the pre-flight dependency checks since check-docker.sh
relies on it for parsing docker info JSON output.

Author: mlwelles

t/Makefile

@@ -19,7 +19,7 @@ endif
 all: test
 
 .PHONY: check
-check: check-go check-docker check-gotestsum check-ack
+check: check-go check-jq check-docker check-gotestsum check-ack
 	@if [ "$(GOOS)" = "linux" ]; then \
 		which protoc > /dev/null 2>&1 || (echo "Error: protoc is not installed or not in PATH" && exit 1); \
 	fi
@@ -32,6 +32,10 @@ check: check-go check-docker check-gotestsum check-ack
 	fi
 	@echo "The dgraph binary is a Linux executable (as required)"
 
+.PHONY: check-jq
+check-jq:
+	@./scripts/check-jq.sh
+
 .PHONY: check-docker
 check-docker:
 	@./scripts/check-docker.sh

t/scripts/check-jq.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# shellcheck source=checkhelper.sh
+source "$(dirname "${BASH_SOURCE[0]}")/checkhelper.sh"
+
+find_jq() {
+	command -v jq 2>/dev/null
+}
+
+install_jq_linux() {
+	install_linux_pkg "jq"
+}
+
+install_jq_macos() {
+	ensure_brew || exit 1
+	brew install jq
+}
+
+install_jq() {
+	run_os_installer install_jq_linux install_jq_macos
+}
+
+main() {
+	if find_jq &>/dev/null; then
+		exit 0
+	fi
+
+	if [[ ${AUTO_INSTALL-} == "true" ]]; then
+		install_jq
+		if find_jq &>/dev/null; then
+			exit 0
+		else
+			err "jq check still failing after installation"
+			exit 1
+		fi
+	fi
+
+	echo ""
+	err "jq is not installed"
+	echo ""
+	err "Please install jq manually:"
+
+	case "$(get_os)" in
+	Linux)
+		err "    apt:    sudo apt-get install jq"
+		err "    dnf:    sudo dnf install jq"
+		err "    yum:    sudo yum install jq"
+		err "    pacman: sudo pacman -S jq"
+		;;
+	Darwin)
+		err "    brew install jq"
+		;;
+	*)
+		err "    (see https://jqlang.github.io/jq/download/)"
+		;;
+	esac
+
+	print_auto_install_hint
+	exit 1
+}
+
+main "$@"