Add yq command requirement check with tests

Author: fchastanet

.cspell/readme.txt

@@ -19,6 +19,7 @@ esac
 exitcode
 fchastanet
 fplain
+François
 Inlines
 inlines
 installfile

.cspell/softwares.txt

@@ -33,6 +33,7 @@ ETAG
 fasd
 Fasd
 fchastanet
+François
 gdebi
 getent
 gettext

src/Linux/requireYqCommand.bats

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# shellcheck disable=SC2154
+# shellcheck disable=SC2034
+
+# shellcheck source=src/batsHeaders.sh
+source "$(cd "${BATS_TEST_DIRNAME}/.." && pwd)/batsHeaders.sh"
+# shellcheck source=src/Linux/requireYqCommand.sh
+source "${srcDir}/Linux/requireYqCommand.sh"
+
+function Linux::requireYqCommand::failure { #@test
+  function Assert::commandExists() {
+    return 1
+  }
+
+  run Linux::requireYqCommand
+
+  assert_failure 1
+  assert_output ""
+}
+
+function Linux::requireYqCommand::success { #@test
+  function Assert::commandExists() {
+    return 0
+  }
+
+  run Linux::requireYqCommand
+
+  assert_success
+  assert_output ""
+}

src/Linux/requireYqCommand.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# @description ensure command yq is available
+# @exitcode 1 if yq command not available
+# @stderr diagnostics information is displayed
+Linux::requireYqCommand() {
+  if [[ "${SKIP_REQUIRE_YQ:-0}" = "0" && "${SKIP_REQUIRES:-0}" = "0" ]]; then
+    Assert::commandExists yq
+  fi
+}