install bashunit and test pre-commit hook

.editorconfig

@@ -9,3 +9,6 @@ charset = utf-8
 
 [{*.yml,*.yaml}]
 indent_size = 2
+
+[*.sh]
+indent_size = 2

tools/.gitignore

@@ -0,0 +1 @@
+lib/

tools/README.md

@@ -0,0 +1,16 @@
+## Tools
+
+Here you can find developer tools to improve your DX.
+
+### Testing
+
+Install testing library with:
+```bash
+cd tools
+curl -s https://bashunit.typeddevs.com/install.sh | bash -s lib 0.10.1
+```
+
+Run bash tests:
+```bash
+lib/bashunit tests
+```

tools/tests/pre-commit_test.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+function test_pre_commit() {
+  spy composer
+
+  "$(dirname "${BASH_SOURCE[0]}")"/../git-hooks/pre-commit.sh
+
+  assert_have_been_called_times 2 composer
+}