diff --git a/.editorconfig b/.editorconfig
index c421ed7..a0cada3 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -12,3 +12,9 @@ charset = utf-8
 
 [*.sh]
 indent_size = 2
+
+[*.{yaml,yml}]
+indent_size = 2
+
+[Makefile]
+indent_style = tab
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
new file mode 100644
index 0000000..0a7f5f4
--- /dev/null
+++ b/.github/workflows/tests.yaml
@@ -0,0 +1,17 @@
+---
+name: 'Run Tests'
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: 'Execute tests'
+        run: './run_tests'
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 32694a7..445d66b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -20,5 +20,4 @@ repos:
         additional_dependencies:
           - mdformat-gfm
           - mdformat-toc
-
 # EOF
diff --git a/Makefile b/Makefile
index c36e206..0e892a4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,4 @@
+export LC_ALL=C
 FILE_NAME=lscolors
 XDG_DATA_HOME ?= $(HOME)/.local/share
 XDG_DATA_HOME := "$(XDG_DATA_HOME)"
diff --git a/tests/works_without_env b/tests/works_without_env
new file mode 100755
index 0000000..980d910
--- /dev/null
+++ b/tests/works_without_env
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+#
+
+unset -v XDG_DATA_HOME
+make install