diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..a0011ee
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+# Exclude test data files from language statistics
+**/tests/*.xml linguist-vendored=true
+**/tests/*.json linguist-vendored=true