Add tests and fix structure to prevent errors

tests/00-selfsanity.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -eu
+
+cd "$(dirname "$0")"
+
+find . -maxdepth 1 -type f -name "*.sh" -print0 | xargs -0 -t -n 1 shellcheck --

tests/01-yamllint.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+cd "$(dirname "$0")/.." || exit 1
+
+find . -type f -name "*.yml" -not -path "./roles/*" -print0 | \
+    xargs -0 -t -n 1 yamllint -s --

tests/02-ansiblelint.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+cd "$(dirname "$0")/.." || exit 1
+
+find . -name "*.yml" -not -path "./roles/*" -print0 | \
+    xargs -0 -t -n 1 -- ansible-lint -x meta-no-info --

tests/Makefile

@@ -0,0 +1,4 @@
+.PHONY = all
+
+all:
+	@for x in *.sh ; do sh "$$x" || exit 1 ; done