diff --git a/.editorconfig b/.editorconfig
index ef4e49d..2909bf8 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -7,7 +7,10 @@ end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
 
-[*.sh]
+[git-check-assertions]
+indent_size = 2
+
+[*.bats]
 indent_size = 2
 
 [*.nix]
diff --git a/flake.nix b/flake.nix
index 588b7bc..ec37673 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,7 +17,7 @@
         packages.default = pkgs.writeShellApplication {
           name = "git-check-assertions";
           runtimeInputs = [ pkgs.git ];
-          text = builtins.readFile ./git-check-assertions.sh;
+          text = builtins.readFile ./git-check-assertions;
         };
         devShells.default = pkgs.mkShell {
           packages = with pkgs; [ bats ];
diff --git a/git-check-assertions.sh b/git-check-assertions
similarity index 100%
rename from git-check-assertions.sh
rename to git-check-assertions
diff --git a/test.bats b/test.bats
new file mode 100755
index 0000000..48965fd
--- /dev/null
+++ b/test.bats
@@ -0,0 +1,10 @@
+#!/usr/bin/env bats
+
+setup() {
+  DIR="$( cd "$( dirname "$BATS_TEST_FILENAME" )" >/dev/null 2>&1 && pwd )"
+  PATH="$DIR:$PATH"
+}
+
+@test "can run" {
+  git-check-assertions
+}